JACK MACKEREL EGGS PACIFIC COAST, 1951-5 SPECIAL SCIENTIFIC REPORT- FISHERIES No. 263 UNITED STATES DEPARTMENT OF THE INTERIOR FISH AND WILDLIFE SERVICE EXPLANATORY NOTE The series embodies results of Investigations, usually of restricted scope, intended to aid or direct management or utilization practices and as guides for administrative or legislative action. It is issued in limited quantities for Official use of Federal, State or cooperating agencies and in processed form for economy and to avoid delay in publication . United States Department of the Interior, Fred A. Seaton, Secretary Fish and Wildlife Service, Arnie J. Suomela, Commissioner JACK MACKERAL EGGS, PACIFIC COAST 1951-54 by David A. Farris Fishery Research Biologist South Pacific Fishery Investigations Bureau of Commercial Fisheries Special Scientific Report — Fisheries No. 263 Washington, D. C, July 1958 JACK MACKEREL EGGS, PACIFIC COAST, 1951-54 By David A. Farris CONTENTS Page Area covered 2 Methods of sampling 2 The stages of jack mackerel egg development 5 Record of jack mackerel eggs, 1951 12 Record of jack mackerel eggs, 1952 20 Record of jack mackerel eggs, 1953 29 Record of jack mackerel eggs, 1954 36 Bibliography 44 ABSTRACT This report contains the results of quantitative sampling of eggs of jack mackerel, Trachurus symmetricus. off California and Baja California during 1951 through 1954. Annual distribution charts are included. JACK MACKEREL EGGS, PACIFIC COAST, 1951-1954 This report contains the results of quantitative sampling of eggs of jack mackerel, Trachurus symmetricus. for the years 1951 through 1954. This report may be considered as an extension of information given by Ahlstrom (1953 and 1954) and Ahlstrom and Kramer (1955 and 1956). The plankton hauls from which the eggs were taken were made at monthly intervals by agencies participating in the California Cooperative Oceanic Fisheries Investigations which is sponsored by the California Marine Research Committee, and which comprises the following organizations: The Scripps Institution of Oceanography of the University of California, the California Department of Fish and Game, the Hopkins Marine Station of Stanford Uni- versity, the California Academy of Sciences and the South Pacific Fishery Investigations of the U. S. Fish and Wildlife Service. The data are presented in six tables: la. Monthly totals of jack mackerel eggs for 1951-1954. lb. Regional distribution of jack mackerel eggs for 1951-1954, 2. Jack mackerel eggs by stage for selected stations in 1951. 3. Jack mackerel eggs for 1951. 4. Jack mackerel eggs for 1952. 5. Jack mackerel eggs for 1953. 6. Jack mackerel eggs for 1954. These tables give the standard numbers of eggs (see below). The author wishes to express his gratitude to Dr. E. H. Ahlstrom for the aid given in identifying the material, and assistance in the preparation of this manuscript. Mr. James R. Thrailkill has prepared the figures. The Staff, South Pacific Fishery Investigations have contributed materially to the routine tasks associated with the collection and preliminary processing of the data. My wife, Paula Farris, has helped with the laborious proof- reading of this report. AREA CUVEREO Tlie area covered by each of the cruises is given by Ahlstrom (1953 and 1954) and Ahlstrom and Kramer (1955 and 1956). An idea of the location of the several stations occupied during the period 1951 through 1954 may be gained from figure 1. However, the exact location of each station at each occupancy is given bv the Staff, South Pacific Fisliery Investigations (1952, 1953, 1954 and 1955 )~. METHODS OF SAMPLING The methods of sampling are given by Ahlstrom (1952:3-6) and Ahlstrom (1953:4-7). Tlie plankton net is obliquely hauled from a depth of approximately 140 meters (200 meters of wire out) to the surface. The angle of stray of the towing wire from the vertical is kept as close as possible to 45°. The angle of stray is measured continuously during a haul by means of an inclinometer riding free on the wire. The plankton samples are preserved in their entirety for later examination. Fish eggs and larvae separated from the hauls are standardized to the number under 10 square meters of sea surface. The manner of designating cruises was changed in 1953 from a system of consecutive numbers to a code based on the year and the month; a conversion table has been given by Thrailkill (1956). The new system used herein gives the year (the first two numbers) and the month (the last two numbers). Thus, 5102 refers to the February cruise of 1951. In tables 3 to 6, a dash (-) indicates that the station was not occupied or if occupied the sample subsequently was spoiled or broken; NQ - haul not quantitative; U - sample unavailable either because it had been mislaid or used in special studies. STATION PLAN 951-1954 ><^„ o^^ o-^^ .0° ^^'■ Figure 1. —Station plan, 1951-1954, of the California Cooperative Oceanic Fisheries Investigations. in If) o Ui O 0) u O CO u CO o o 4-) c o I I 0) CO H 4-5 Q or 3 -^ --H lO O^ -H CO CO o^ O r^ O -c vC lO O CM -H -H C\) r-H o o o o -H O CO in c- o CV> h- sc r^ o CO o 3^ in CO in CM in CM — I ■— I CO •^ CO o in CO in t— o o vC in ^H c^ '^r TT o r^ — I r^ in o -H CO in 'S' T vC vC r- nC •^ CM CM CO CM sc CO in CO TT C CO C> CO CO "^ ^ CM CM r- nC CM vC in ^ in in s c^ c a- Q o M* -sC CC CM CM CO ^ CO CJ -c CO CO t~- CO "^ -J^ ^ TT CM CM CM — c sC CD sC* '5'* o" o* in '-I CM —I o sc ^ in CO '-H CD C^ — I -H 2 CO CT- CO in ^ 0) u o o c v> CO ■(J CD x: *j M CD +J CO o c o CO o in y— s CO CM CO 1 <-> ■V Si CO u r— 1 CM CO ■^ •a CO in in in in 0) O^ G^ O C> < >- , — 1 ^H ^H F— ( * in in u o M CO o CO o +-> x: f3 E o I Xi CO H CO ■-H r- c in E J-c --I !-< O 1 0) <*-. CO £ •M CM *^ ^-H ■ — 1 3 CO O o « 00 0) CO E .^■rt CO J 03 CD •-H C c c^J (-1 '^ F-H O 1 CD «4-( O ^ •pH ^-h *J 1— ^ f-H C CO o O t/: o OJ fO c .^•rH CO ^ CQ o o o o o o o o »-H — 1 in 0^ 1— i ^ O ^ CM CO F^ CO CO o^ <-> * • • • o c r~ o sO H in o CM r-H -H CM — 1 •p c OJ o F— 1 ri CM ^ ^ CD — ( CO ^ CO c- cc f-H in o c 4-) in (-H C^ >4D O » • • H ■— < 'T' r- CO — 1 1^ C O c >H —1 u O 1 0) C4_j J-^ x: •rH Cr o O CO -^ CO C CM ^3" sC' C -^ in r— CM r- 'C -"S" CM -^ CO o^ -JD ^ •^ ^ rr o^ r~ ;> o CM -H cc CO o t^ r- -T in 3^ ^H ^H ^ o in CO r~- 03 rr — I in in CO CO -^ u I—I CM CO 'C CO in in in in 0) CT- CT~ CT- o^ X ^H 1 — i . — t i — 1 THE STAGES OF JACK MACKEREL EGG DEVELOPMENT The continuum of egg development is divided into a series of arbitrarily but rather precisely defined stages (fig. 2). The primary reason for staging eggs is to determine the relationship between rate of development and temperature. This is needed in order to determine the number of days' spawning represented in each sample. The method is also useful for determining the period of the day during which spawning takes place. Only selected stations are given since stations were deleted for various reasons, among which were poor preservation of material making staging unreliable and poor temperature records. .ii«»~« -•;••- Figure 2. — The stages of jack mackerel egg development. Stage I: Unfertilized eggs or fertilized eggs prior to cell division. Stage II: Begins when the first cell becomes visible on the yolk and ends at the completion of the blastodisc formation (about 256 cell stage). Stage III: Starts at the completion of blastodisc formation and is terminated when the germ ring has migrated to its greatest diameter (halfway up the egg). Stage IV: Begins as the germ ring moves upward over the greatest diameter and stops when the germ ring lies over the oil globule, prior to blastopore closure. Stage V: Begins at blastopore closure and terminates when the tail starts to^separate from the yolk. Stage VI: Begins when the tail bud comes free of the yolk and stops when the posterior eighth of the body is free of the yolk. Stage VII: Begins when the posterior eighth of the body is free of the yolk and stops when the posterior quarter of the body is free of the yolk. Stage VIII: Begins when the posterior quarter of the body is free of the yolk, and ends as the tip of the tail approaches the chin. The tail portion of the embryo begins to rotate out of the embryonic plane and the fin-fold is moderately wide. Stage IX: Is characterized by the tip of the tail laterally approaching the head. The oil globule comes to lie in the anterio-vertical portion of the yolk sac. The fin-fold is wide and fully formed, At the termination of the stage, the embryo hatches. Disintegrate: All jack mackerel eggs whose internal structure is such that staging is impossible fall into this category. Table 2. --Record of jack mackerel eggs by stages of development for selected stations occupied in 1951 Stage: Station II III IV VI VII VIII IX Dis. Total Cruise 5103: 80.55 .90 .100 .110 85.90 90. 100 .110 .120 93.70 .80 .90 97.70 .90 100.60 .70 .80 .90 .100 103.40 .50 .60 .70 .80 107.40 .60 .70 .80 110.50 .60 .70 .80 113.50 .60 .70 117.60 .70 120.35 .60 123.50 127.60 130.40 15 98 94 45 0 247 1 66 0 0 64 0 2 0 114 0 0 0 0 21 0 7 291 0 0 0 362 0 0 1,060 17 0 231 0 100 0 0 1,385 0 0 312 0 1 0 32 20 29 0 0 9 0 0 0 0 0 190 0 8 312 0 0 37 0 0 0 338 0 0 234 74 0 311 38 116 0 0 0 1,472 0 27 0 0 14 0 15 269 0 0 339 0 0 2 0 14 0 318 10 0 369 12 0 604 0 0 140 416 1,392 0 0 36 0 0 0 0 0 0 0 0 5 0 0 6 0 76 100 63 0 121 45 18 0 14 40 16 20 0 212 0 146 0 433 28 89 5 0 218 0 38 98 201 93 979 0 0 372 0 0 77 0 427 0 277 0 15 0 0 22 0 232 0 297 45 0 0 0 0 48 28 0 19 225 0 62 0 40 0 388 33 0 121 670 217 328 0 286 91 0 59 0 198 0 0 7 7 0 19 0 199 0 67 77 0 0 0 0 0 0 207 0 0 343 0 478 0 159 0 198 0 770 489 677 0 12 0 5 0 5 0 8 0 0 5 0 0 1 0 Total 695 5,120 5,926 3,853 4,549 2,961 2,478 2,915 0 89 0 6 541 0 40 0 0 498 0 4 0 8 111 0 12 0 95 247 122 0 21 0 471 0 75 0 0 654 0 74 0 0 217 119 0 0 0 635 0 161 0 28 888 298 135 0 0 2,565 516 0 7 0 1,143 74 151 0 0 402 0 244 0 0 2,333 0 48 0 0 375 0 9 0 0 64 0 236 0 0 814 0 14 0 0 68 0 43 0 0 91 0 0 0 0 237 0 22 0 0 629 108 144 0 0 329 49 77 0 0 885 0 0 0 0 1,242 0 168 0 0 1.167 0 13 0 2 319 0 87 0 0 1,757 0 7 0 2 50 21 19 0 0 73 0 0 0 0 550 59 0 0 0 475 0 0 0 0 2 927 74 0 0 1,540 185 0 0 0 907 0 36 0 7 1,296 0 815 0 0 1,153 0 100 0 0 3,844 0 14 0 0 62 0 2 0 0 12 0 2 0 0 10 0 0 0 0 10 0 0 0 0 7 478 2 .915 28 148 28,673 Table 2. — Record of jack mackerel eggs by stages of development for selected stations occupied in 1951 Stage: I II III IV V VI VII VIII IX Dis. Total Station Cruise 5104: 70.110 9 543 0 61 17 0 0 121 0 0 751 73.61 0 0 73 0 0 0 12 0 0 0 85 77.55 0 0 3 0 0 7 3 3 0 0 16 80.55 0 3 0 5 0 25 0 5 0 0 38 .60 0 15 0 0 0 18 0 10 0 0 43 .70 0 15 0 5 13 0 3 0 0 1 37 .100 0 1 0 0 6 6 0 5 0 0 18 .110 0 18 0 7 3 0 13 0 7 0 48 .120 1 51 0 17 40 0 0 24 0 0 133 .130 0 1 16 7 21 10 0 9 0 3 67 87.60 13 36 0 0 7 0 3 0 0 0 59 .70 0 246 0 38 3 17 0 5 0 0 309 .90 0 507 222 15 254 15 0 15 0 0 1,028 90.37 0 11 0 23 0 0 11 3 0 0 48 .53 0 12 0 0 17 0 0 0 0 0 29 .60 0 0 61 0 72 0 0 0 0 0 133 .80 7 64 0 123 61 2 0 74 0 0 331 .90 19 132 0 89 26 2 0 12 0 0 280 .100 1 83 75 0 13 0 0 28 0 0 200 .110 6 0 234 0 68 0 0 97 0 6 411 93.70 0 104 0 362 173 0 0 104 0 5 748 97.50 6 432 0 0 133 0 64 4 0 16 655 .70 0 181 0 140 0 6 0 18 0 0 345 .80 0 0 59 0 0 21 0 16 0 1 97 .90 0 4 0 0 8 0 0 3 0 0 15 100. 40 3 52 0 0 104 108 0 28 0 0 295 .60 3 19 0 24 0 239 1 62 0 0 348 .90 0 75 0 7 0 9 0 12 0 0 103 .100 0 212 0 133 0 0 59 0 0 0 404 .110 0 46 0 0 13 0 3 0 0 0 62 .120 0 6 0 0 9 0 0 4 0 0 19 103.50 22 367 0 54 9 116 0 18 0 22 608 .60 2 2 515 0 300 0 0 342 0 2 1.163 .70 0 18 0 0 157 0 0 115 0 0 290 .80 3 113 0 84 0 0 80 1 0 0 281 107.40 0 49 0 0 12 0 0 21 0 0 82 .60 21 168 0 0 6 0 0 2 0 0 197 .70 0 0 128 0 26 0 8 0 0 0 162 110.50 5 219 0 0 68. 0 0 7 0 5 304 .70 0 27 (iB 0 57 0 0 12 0 0 164 .80 0 41 0 17 0 9 0 2 0 0 69 .90 0 5 0 18 12 0 7 0 0 0 42 .100 5 348 o 0 54 0 0 43 0 0 450 8 Table 2. — Record of jack mackerel eggs by stages of development for selected stations occupied in 1951 Stage: Stat ion II III IV VI VII VIII IX Dis. Total Cruise 5104 (cont •d): 113.50 44 353 0 104 37 26 0 11 0 35 610 .60 58 424 0 6 0 12 0 4 0 0 504 .70 0 0 153 0 179 0 0 74 0 9 415 117.40 0 6 0 0 8 0 1 0 0 0 15 . 50 0 18 0 0 11 0 0 0 0 0 29 .60 43 726 0 460 0 0 54 0 0 0 1.283 .70 2 137 0 0 215 0 0 81 0 17 452 Total 273 5.890 1,607 1,799 2,212 648 322 1,395 7 122 14,275 Cniise 5105: 70.90 1 7 5 0 0 0 0 0 0 0 13 .100 1 257 0 8 149 35 14 8 1 21 494 .110 0 79 3 60 40 0 16 1 0 0 199 77.65 0 18 0 5 5 0 0 0 0 0 28 80.55 0 5 0 1 0 10 0 0 0 0 16 03.55 0 77 0 5 24 3 0 8 0 0 117 .70 4 580 12 49 16 8 0 8 0 37 714 07. ''"O 3 39 3 53 87 289 238 192 54 17 975 .80 11 520 0 365 150 121 38 35 11 81 1,332 .90 21 137 17 119 216 21 104 198 13 277 1,123 90.53 22 461 30 165 56 42 8 122 0 4 910 .60 5 741 0 45 163 17 0 66 37 3 1.077 .70 3 47 73 24 24 63 0 14 1 3 252 .80 4 25 31 0 31 0 2 23 0 4 120 .90 0 10 75 0 45 0 9 0 0 5 144 . 100 0 70 33 2 39 0 59 70 0 6 279 .110 1 35 72 21 57 3 15 1 0 0 205 .120 33 124 0 206 29 29 84 0 0 1 506 93.40 0 5 0 0 47 42 2 25 0 0 121 .60 3 465 24 376 19 237 0 8 0 17 1,149 .80 1 188 120 71 95 76 19 24 0 7 601 .90 0 0 198 0 150 0 52 21 0 0 421 97.50 11 204 24 162 215 58 8 69 0 13 764 .60 238 373 24 34 49 11 0 13 3 3 748 .70 0 0 24 0 15 0 5 0 0 0 44 .00 1 10 0 0 11 0 0 10 0 0 32 .90 0 19 5 0 1 12 10 0 0 0 47 100.40 7 219 25 460 52 68 1 21 0 1 854 .50 2 330 0 54 430 362 0 250 10 4 1,442 .70 3 0 14 5 0 3 0 0 0 0 25 Table 2. — Record of jack mackerel eggs by stages of development for selected stations occupied in 1951 Stage: I II III IV V VI VII VIII IX Dis. Total Station Cruise 5105 (cont •d): 100.90 0 0 16 0 18 0 0 1 0 0 35 .120 0 10 0 0 10 0 16 24 0 0 60 103.35 2 0 0 0 12 8 0 22 0 2 46 .40 0 0 108 3 42 7 25 133 0 5 323 .50 0 1 0 13 11 5 0 3 0 0 33 .80 0 0 179 1 114 0 7 33 0 0 334 107.40 6 101 11 3 1 6 0 0 0 0 128 .50 1 7 206 10 40 0 0 5 0 0 269 .70 1 58 0 0 67 0 6 57 0 12 201 .80 9 212 0 84 187 114 0 0 0 11 617 110.35 0 9 0 2 6 5 2 1 0 3 28 .40 0 50 1 25 56 19 5 9 1 0 166 .50 7 11 213 1 138 0 19 15 1 1 406 .70 0 3 5 6 6 10 16 1 1 0 48 .80 0 30 12 0 38 0 0 0 2 0 82 .90 0 7 52 0 29 16 1 15 4 0 124 iia.6o 1 1 56 1 36 0 0 0 0 1 96 .70 0 20 32 4 19 3 69 360 3 16 526 117.40 1 15 1 6 0 0 0 3 0 0 26 .70 12 470 7 9 13 0 0 0 0 6 517 120.35 2 2 29 0 43 27 0 0 0 0 103 .50 0 54 7 9 90 58 37 41 0 1 297 Total 417 6,106 1.747 2.467 3.191 1.788 887 1.910 142 562 19. 2r Cruise 5106: ^0.80 0 8 0 8 8 17 17 8 0 0 66 70.55 45 61 0 0 30 0 0 30 0 0 166 .100 0 54 0 7 0 25 0 46 0 0 132 97.40 1 7 0 1 0 0 0 0 0 0 9 100.70 12 27 0 5 0 1 0 5 0 0 50 107.50 1 31 0 0 0 13 0 94 0 0 139 .60 0 0 40 56 0 33 0 5 0 0 134 .70 2 0 0 28 2 0 15 0 0 0 47 .80 0 6 0 0 8 0 0 8 0 2 24 110.60 12 7 2 0 269 () 5 107 0 0 402 .90 0 10 0 0 0 32 0 2 0 0 44 120.70 0 0 3 29 0 0 13 0 0 0 45 .80 0 19 0 0 17 0 8 0 0 0 44 Total 73 230 45 134 334 121 58 305 0 2 1.302 10 Table 2. --Record of jack mackerel eggs by stages of development for selected stations occupied in 1951 Stage: I II III IV V VI VII VIII IX Dis. Total Station Cruise 5107: 47.55 6 28 0 0 3 0 0 0 0 0 37 73.51 6 0 0 0 12 3 3 0 0 0 24 90.100 5 32 0 18 0 5 0 0 0 0 60 100.70 0 5 0 10 0 0 5 0 0 0 20 .100 2 2 0 0 2 0 9 0 0 0 15 120.45 0 5 0 4 0 2 0 0 0 0 11 Total 19 72 0 32 17 10 17 0 0 0 167 Cruise 5108: 67.65 5 8 0 0 0 0 0 0 () 0 13 70.51 2 2 0 0 0 0 0 0 0 0 4 97.70 0 10 0 0 5 0 0 0 0 0 15 100.40 0 2 0 0 2 0 0 0 0 0 4 Total 7 22 0 0 7 0 0 0 0 0 36 11 RECORD OF JACK MACKEREL EGGS, 1951 Jack mackerel eggs were collected from February until October, although only negligible amounts were taken during September and October (table la). The month of peak occurrence was March, when nearly one-third of the total number of eggs were obtained. A partial regional analysis (table lb) indicates that over half the eggs were spawned off California and that very few eggs were spawned to the south of Point San Eugenio (below station line 120). Of the four years reported, 1951 may be characterized as having a northern distribution accompanied by early spawning. The quantitative distribution (annual standard haul totals) of jack mackerel eggs is given in figure 3. 12 CUMULATIVE TOTALS I -30 31-300 ^ 301-3000 ^H OVER 3000 o STATIONS OCCUPIED JACK MACKEREL EGGS 1951 Figure 3. --Jack mackerel eggs, 1951: distribution and relative abundance. 13 Table 3. --Record of jack mackerel eggs. 1951 Cruise number Station 5101 5102 5103 5104 5l()5 5l(i6 5107 5l(>8 5109 5110 5111 5112 40.38 _ _ - .40 - - - .45 .50 .60 .70 - - - .80 _ _ - .90 .100 - - - .110 43.42 _ _ - .50 .60 - - - 47.50 - - - .55 .60 50.47 .50 - - - .55 .60 .70 _ - - .80 - _ _ .90 .100 - - - .110 53.52 .54 .55 .64 - - - .65 57.51 - - - .54 - - - .55 .64 .65 60.55 - - - .60 0 - .70 .80 - - - .90 - _ _ .100 .110 .120 .130 (-) - Station not occupied (U) - Sample unavailable (NQ) - Sample not quantitative , . I I I u 2 I ~_ I - - 0 47 2 - - - - - 46 20 - - - - - NQ 230 - - - - - 3 0 0 17 - - - - - 0 NO 0 0 - - - - - 61 0 0 - - - _ _ 37 _ ^ ^ ~ ^ U 0 0 u 0 — ^ ~ - - 0 0 - - - - - 0 0 - - - - - 0 0 - - - - - 38 - - - - - - 14 1 0 - - - - _ 0 70 0 0 u - - - - - 0 23 0 0 0 - _ - _ _ _ _ _ 0 0 0 6 0 0 0 0 0 0 0 0 23 0 0 0 0 0 5 66 49 0 0 0 0 0 9 10 74 0 0 - 0 0 f) 318 i) - - - 0 0 0 886 0 - - - - - 235 0 - - - - - 51 - - - - - Table 3. — Record of jack mackerel eggs, 1951 Cruise number Station 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 61.55 U _ _ 0 0 0 1 _ ^ . . . 63.52 - - - - - - - 0 - - 0 0 .55 - - - - - - - 0 - - 0 0 .57 U - - 0 0 26 0 - - - - - .65 - - - - - - - 16 - - - _ .67 u - - 0 - 214 98 - - - - - 67.50 - - - - - - - 100 - - 0 0 .55 u - - 0 0 3796 0 12 - - 0 0 .65 0 - - 0 0 U 0 13 - - 0 0 70.51 - - - - - - - 4 _ - 0 0 .55 0 - - 0 0 166 0 - - - - - .60 u - - 0 0 1375 39 7 0 0 0 0 .70 0 - - 0 0 1011 29 0 0 0 0 0 .00 u - - 8 6 1382 7 0 0 0 0 0 .90 LI - - (J 13 184 0 - 0 0 - - . 100 - - - 18 494 132 0 - - _ - - .110 - - - 751 199 0 1 - _ - _ _ .120 - - - - - 4 0 - - - - - .130 - - - - - 0 - - - - - - 73.50 - - - - - - - 0 - - 0 0 .51 u - - 0 0 0 24 - - - - - .60 - - - - - - - 0 u 0 0 0 .61 u - - 85 0 1480 545 - - - - - 77.50 - - - - - - - 0 u 0 0 0 .55 0 - - 16 0 270 1138 0 u 0 0 0 .65 0 - - 3 28 596 4110 0 0 0 0 0 80.51 - - - - - - - 0 1 0 0 0 .55 u 0 541 38 16 124 NQ 0 0 0 0 - .60 u 0 1658 43 - 664 NO 6 0 0 0 0 .70 u 24 2410 37 _ 274 135 0 0 0 0 (I .80 u 1969 1950 0 - 677 3 3 0 0 0 0 .90 u 939 498 0 - 10 1 - 0 0 0 0 .100 - 1408 HI 18 - 23 3 - 0 0 0 - .110 - U 247 48 - 14 0 - - - - - .120 - 0 1029 133 - - - - - - - - .130 - 0 U 67 - - - - - - - - 83.43 - - - - - - - - - - 0 0 .55 - 0 - 0 117 0 - - 0 0 _ - .60 L" 0 - 0 13 205 - - - 0 - - .70 U - - 0 714 766 - - - - - - .80 c - - 0 - 427 _ - - - _ - .90 u - - 0 - 44 - - - - - _ 85.38 - - - - - - - 0 0 0 0 0 .40 - - 0 - - - u 0 0 0 0 0 15 Table 3. --Record of jack mackerel eggs, 1951 Cruise number Station 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 B5.50 _ _ 0 _ _ _ _ U U () 0 0 .60 - - - - - - - 26 - 0 0 - .70 - - 0 - - - - 75 - - - - .80 - - 5290 - - - - 18 - - - - .90 - - 471 - - - - - - - - - 87.35 0 0 - 0 6 52 - 0 - - - - .40 u 0 - 0 0 0 - - - - - - .50 - - - 0 55 u - - - - - - .60 u - - 59 14 u - - - - - - .70 u - - 309 975 145 - - - - - - .80 u - - 1908 1332 159 - - - - - - .90 0 - - 1028 1123 0 - - - - - - 90.28 - - - - - - - 0 0 0 0 - .30 u 0 0 0 251 324 33 0 0 0 - .37 u 0 0 48 40 108 267 544 1 0 0 0 .45 0 0 0 0 0 U NQ 39 0 0 0 0 .53 u 0 0 29 910 11 2 6 0 0 0 0 .60 u 9 u 133 1077 1318 118 343 0 0 0 0 .70 LI 0 2950 8-0 252 16 31 65 0 0 0 - .80 u 403 L 331 120 158 8 0 - - - - .90 u f> 2790 28fi 144 10 61 0 - - - - .100 u 0 654 200 279 422 60 U - - - - .110 u 0 217 411 205 181 282 - - - - - .120 u 0 635 1829 506 - - - - - - - 93.27 - - - - - - - 1 0 0 0 0 .30 u 0 0 0 0 0 174 U 0 0 0 0 .40 u 0 0 0 121 1 72 199 0 0 - 0 .50 0 0 0 520 295 {j 37 147 0 0 0 0 .60 0 0 u 1570 1149 266 - 0 - - - - .70 0 1165 688 748 0 127 - 0 - - - - .80 u 756 2565 469 601 I! 39 0 - - - - .90 0 0 1143 1479 421 106 87 - - - - - 97.30 - - - - - - - 0 0 1 0 0 .32 0 0 0 41 61 5 180 0 0 0 0 NQ .40 0 0 0 76 6 9 87 Ij 4 0 0 0 .50 u u 0 655 764 994 325 106 u 0 0 0 .60 u 1972 u 2560 748 1282 219 8 - - - - .70 u 11 402 345 44 125 117 15 - - - - .80 u 0 u 97 32 107 353 0 - - - - .90 0 0 2333 15 47 43 125 - - - - - 100.29 - - - - - - - u 0 0 0 0 .30 u 0 0 3 8 0 - 0 0 0 0 0 .40 u 0 0 295 854 25 223 4 0 0 0 0 .50 \j 0 0 2222 1442 93 73 0 0 0 0 0 16 Table 3. — Record of jack mackerel eggs, 1951 Cruise niimber Station 5101 5102 5103 5104 5105 5106 5107 5108 5109 5ll(j 5111 5112 IUO.60 Li 532 375 348 2140 293 95 5 0 0 0 0 .70 U 9 64 0 25 50 20 51 0 0 - 0 .80 U 0 814 30 8 99 872 - 0 0 0 - .90 0 0 68 103 35 10 84 - 0 0 - - .100 u - 91 404 14 - 15 - - - - - .110 u - - 62 30 - - - - - - - .120 0 - - 19 60 - - - - - - - 103.30 - - - - - - - - 0 0 0 0 .35 - - V 1275 46 132 - - 1 0 0 0 .40 u - 237 0 323 37 - - I) 0 0 0 .50 V - 629 608 33 131 - - - - - - .60 0 - 329 1163 10 263 - - - - - - .70 () - 685 290 42 94 - - - - - - .80 u - 1242 281 334 - - - - - - - 105.32 - - - - - - _ 0 - - - - .35 0 0 - - - - - ^8 - - - - .40 - 0 - - - - - 0 - - - - .50 - 0 - - - - - 0 - - - - .60 - 0 - - - - - 5 - - - - .70 - 0 - - - - - - - - - - .80 - 0 - - - - - - - - - - .90 - 0 - - - - - - - - - - 107.32 - - - - - - - - 0 0 0 0 .35 - - 0 25 17 25 - - L 0 0 0 .40 0 - 1167 82 120 2 - - 0 0 0 0 .50 u - L 810 269 139 - - - - - - .60 L - 319 197 1 134 - - - - - - .70 0 - 1757 162 201 47 - - - - - - .80 0 - 50 41 617 24 - - - - - - 110.33 - - - - - - - U 0 0 0 0 .35 0 (J 9430 0 20 5 - 9 0 0 0 0 .40 0 0 r, 0 166 U - 21 LI 0 0 0 .50 0 0 73 304 406 "7 1 - 0 0 0 0 0 .60 0 0 55() 1520 78 402 - 18 0 0 0 0 .70 0 0 475 164 48 421 - - - - - - .80 0 0 2 69 82 260 34 - - - - - .90 0 0 0 42 124 44 6 - - - - - .100 0 0 0 450 25 0 - - - - - - .110 0 - LI 172 0 0 - - - - - - 113.35 (1 0 0 0 6 2 - - - - - - .40 u 0 L 35 6 3 - - - - - - .50 0 0 1540 610 14 0 - - - - - - .60 u 0 907 504 96 1591 - - - - - - .70 0 0 1296 415 526 119 - - - - - - 17 Table 3. --Record of jack mackerel eggs, 1951 Cruise ni'mber ritation 5i;il 5102 5103 5104 5105 5106 510^ 5 IOC 5109 5110 5111 5112 115.27 _ _ _ _ _ _ _ u 0 0 0 0 .30 - - - - - - - 135 (J 0 0 0 .35 - - - - - - - U 0 0 0 0 .40 - - - - - - - u 1) 0 0 0 .50 . 60 11 '.35 - - - - - - - 0 - - - - •) 0 (■• 0 0 0 _ _ _ _ _ .40 u 1 \ 0 15 26 0 - - - - - - .50 V 0 Q 29 17 0 - - - - - - .60 Q f; 1153 1283 5 45 - - - - - - . 70 !) (I 3844 452 517 0 - - - - - - 120.25 - - - - - - - u 0 0 0 0 .30 - - - - - - - 0 0 0 0 0 .35 {; r. V 1 62 0 103 0 0 n c 0 0 0 .45 U i) 0 2 0 4 11 0 0 0 0 0 .50 (' u 0 2 297 0 0 0 - 0 0 0 .60 L 0 12 134 0 21 20 0 0 0 0 0 .70 0 0 0 227 7 45 0 0 0 0 0 0 .80 U 0 0 65 10 44 0 7 0 0 0 - .90 0 0 0 0 0 559 0 i) 0 0 0 - . 100 0 0 IJ 0 0 0 - - - - - - .110 (, - 0 0 0 0 - - - - - - 123.37 - - - - - - - 4 0 0 0 0 .40 0 0 0 0 66 4 0 0 0 0 0 0 .50 0 0 10 41 1 0 3 0 - 0 - - .60 u 0 0 72 12 43 0 0 - - - - 127.34 - - - - - - - u 0 0 0 - .40 0 0 0 11 0 0 0 0 0 0 0 - .50 0 0 0 4 0 10 0 0 - 0 - - .60 u 0 10 2 7 0 0 0 - - - - 130.30 - - - - - - - 0 0 0 0 - .35 0 0 0 0 0 I] 0 0 N^ 0 0 - .40 0 0 7 0 0 0 0 u 0 0 0 - .50 0 0 0 0 19 d 0 0 0 0 0 - .60 0 0 0 22 0 0 0 0 0 0 0 - .70 0 0 0 17 0 0 - - 0 0 - - .80 u 0 4 0 0 u - - - - - - .90 - - - - - 0 - - - - - - 133.25 - - - - - - - 0 0 0 0 - .30 0 0 u 0 20 0 0 0 u 0 0 - .40 0 0 4 0 8 0 3 0 - - - - .50 0 0 0 8 8 0 0 0 - - - - .60 0 0 1 42 29 0 - - - - - - 18 Table 3. — Record of jack mackerel eggs, 1951 Cruise number station 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 137.23 . _ _ _ _ _ . 0 U 0 0 - . 30 - - - - - - - 0 u 0 0 - .35 0 0 0 0 0 0 0 - - - - - .40 0 0 0 0 0 0 0 0 - - - - .50 u 0 0 0 4 0 0 0 - - - - . 6( ) 0 0 0 0 5 0 - - - - - - 1 10.30 - - - - - - - - 0 - - - .35 - - 0 - - 0 - - 0 - - - .40 - - 0 - - 0 - - 0 - - - .50 - - 20 - - 0 - - 0 - - - .60 - - 0 - - 0 - - 0 - - - .-^0 - - 0 - - 0 - - 0 - - - .00 - - 0 - - 0 - - - - - - .90 - - - - - 0 - - - - - - 143.30 - - 3 - - 0 - - 0 - - - .35 - - 5 - - 0 - - 0 - - - .40 - - 0 - - 0 - - - - - - .50 - - u - - 0 - - - - - - .60 - - - - - 0 - - - - - - 147.20 - - 0 - - - - - 0 - - - .25 - - 0 - - 0 - - u - - - .30 - - 0 - - 0 - - 0 - - - .40 - - 0 - - 0 - - - - - - .50 - - - - - 0 - - - - - - .60 - - - - - 0 - - - - - - 150.19 - - - - - - - - 0 - - - .25 _ - 0 - - 0 - - 0 - - - .30 - - 0 - - Ci - - 0 - - - .40 - - 0 - - 0 - - 0 - - - .50 - - 0 - - 0 - - 0 - - - .60 - - 0 - - 0 - - 0 - - - .70 - - 0 - - 0 - - 0 - - - .80 - - 0 - - 0 - - 0 - - - .90 - - - - - 0 - - 0 - - - .100 - - - - - - - - 0 - - - 153.16 - - - - - - - - 0 - - - .20 - - 0 - - 0 - - 0 - - - .30 - - 0 - - 0 - - - - - - .40 - - 0 - - 0 - - - - - - .50 - - 0 - - 0 - - - - - - 157.10 - - 0 - - 0 - - 0 - - - .20 - - 0 - - 0 - - 0 - - - .30 - - 0 - - 0 - - - - - - .40 - - 0 - - 0 - - - - - - .50 - - 0 - - 0 - - - - — — Total 0 9186 56217 32405 22346 26559 11053 2307 7 10 0 19 RECORD OF JACK MACKEREL liGGS, 1952 Spawning began in January, rose to a peak in May and ceased by the end of September. A partial regional analysis indicates that the center of spawning was more compact than in 1951 with over 90 percent of the spawning occurring off southern California and northern Baja California (station lines 77-107). The record shows less spawning off central and nortiiern California (lines 40-73) and off central and southern Baja California (lines 110-157). The quantitative distribution (annual standard haul totals) of jack mackerel eggs is given in figure 4. 20 JACK MACKEREL EGGS 1952 CUMULATIVE TOTALS I -30 31-300 301-3000 ^M OVER 3000 o STATIONS OCCUPIED Figure 4. — Jack mackerel eggs, 1952: distribution and relative abundance. 21 Table 4. --Record of jack mackerel eggs, 1952 Cruise number Station 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 40,38 _ - - - - - U - .50 - - - - - - 0 - — ~ ■" .60 - - - - - - 0 - - — ~ .70 - - - - - - 6 - - - "■ ,80 - - - - - - 0 - - " ~ .90 - - - - - - 0 - - — ~ 43.42 - - - - - - U - - - — .50 - - - - - - NQ - - - - 47.50 - - - - - - 0 - - — "■ .55 - - - - - - 0 - — - — .60 - - - - - - 0 - - - - 50.47 - - - - - - u - - - — ,50 - - - - - 0 0 - - - - .55 - - - - - - 0 - - - — .60 - - - - - - 0 - - - - .70 - - - - - - 0 - - — — 53.52 - - - - - 0 - - - — — .55 - - - - - 0 0 - - - - .60 - - - - - - 0 - - - — .65 - - - - - 0 0 - - - - 57.51 - - - - - 0 0 - - - - .55 - - - - - 0 0 - - - - .60 - - - - - - 0 - - - - .65 - - - - - 0 u - - - - 60.55 - - - 0 - 0 NQ 0 0 0 0 .57 - - - - - - 0 - - - - .60 . _ - 0 - u 36 - 0 0 0 .65 _ - - - - 0 NQ - - - - .70 _ _ - 0 - 0 327 - 0 0 0 .80 _ _ - u U NO - - 0 0 0 t .90 .. . - 0 u 0 30 - 0 0 0 .100 - . - - u 5 - - 0 u 0 .110 - - - - - - - - 0 0 c 63.52 - - - 0 u 0 0 0 0 0 0 .55 _ _ _ 0 u 0 28 0 0 0 0 .60 - - - - u i\ 22 - - - - .65 - - - - u 0 0 - - - - 67.50 .. - - 0 0 h NQ 0 0 - - ,55 - - - 0 LI 0 9 0 0 () (; .60 - - - - - 0 6 - - - - 65 - - - - - 0 0 0 0 0 0 22 Table 4. --Record of jack mackerel eggs, 1952 Cruise number Station 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 70.51 . _ _ ^ _ _ 0 0 0 _ 0 .55 - - - 0 U u - - - - - .60 - - - 0 U 0 0 0 0 0 0 .65 - - - - u 0 u - - - - .70 - - - 0 u 0 16 0 0 0 0 .75 - - - - - u - - - - - .80 - - - 0 u 25 3 0 0 0 0 .90 - - - 0 u 226 0 - - - - .100 - - - - u 159 - - - - - 73.50 - - - 0 u 0 0 0 0 0 - .55 - - - - u 0 30 - - - - .60 - - - 0 u NQ 689 228 0 0 - 77.50 - - - 0 u 0 19 0 0 - - .55 - - - 0 u 0 U 6 0 0 0 .60 - - - - u 0 171 - - - - .65 - - - - u NQ 791 U 0 0 0 80.51 0 0 U 0 u 0 0 u 0 0 0 .55 0 0 0 0 u 33 0 0 0 0 0 .60 0 0 0 0 u 1070 28 85 0 0 0 .65 - - - - - 2300 30 - - - - .70 0 0 0 0 u 1970 0 35 0 0 0 .75 - - - - - NQ - - - - - .80 0 u 371 0 u 10 3 14 0 0 0 .85 - - - - u - - - - - - .90 0 6 NQ 0 u 239 13 0 0 0 0 .100 0 11 - 0 223 U 162 0 0 0 0 .110 0 - - - - - - - - - - 83.43 - - - - u 46 - - - - - .55 - - - 0 3060 U - - - - - .60 - - - 0 U 840 - - - - - .65 - - - - u - - - - - - .70 - _ - 39 u 1820 - - - - - .75 - - - - u 356 - - - - - .80 - - - 0 u 98 - - - - - .85 - - - - u - - - - - - .90 - - - 0 u 64 - - - - - 85.38 0 0 0 - - - 5 0 0 0 0 .40 0 0 0 - - - 0 u 0 0 0 .45 - - - - - - 9 - - - - .50 0 0 0 - - - 10 0 0 0 0 .55 - - - - - - 115 - - - - 23 Table 4. — Record of jack mackerel eggs, 1952 Cruise number Station 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 85.60 0 0 0 _ _ _ 324 0 3 0 0 .70 0 0 0 - - - 65 - - . . .80 - - - - - - 85 _ _ ^ _ .90 - - - - _ _ 0 ^ _ _ _ 87.35 - - - 0 U 0 _ _ _ _ ^ .40 - - - 0 u 5 . ., _ •■ _ .45 - - - - u U _ _ « . _ .50 - - - 0 1038 0 - _ _ _ _ .55 - - - - 633 538 _ _ _ ^ . .60 - - - 35 2265 382 - - - _ _ .65 - - - - 3070 - - - - _ _ .70 - - - 100 6180 784 - _ . ^ . .75 - - - - 5770 - _ _ _ _ _ .80 - - - 124 415 536 - - - _ _ .90 - - - 0 - - - _ .. _ _ 90.28 0 0 0 0 125 36 6 0 0 0 0 .30 0 0 0 0 249 13 40 6 471 0 0 .37 0 0 0 0 390 11 161 197 0 _ 0 .45 0 0 0 0 606 U 18 U 0 0 0 .53 0 0 0 0 81 416 145 81 3 0 0 .60 0 0 0 0 3560 261 30 0 6 0 0 .65 - - - - 168 745 _ _ _ _ _ .70 0 11 0 0 1141 2910 0 11 0 0 0 .75 - - - - 992 - _ _ _ _ .80 0 505 1370 0 1610 194 9 _ _ _ _ .90 0 309 4470 132 752 650 3 _ _ _ _ .100 - - - 205 _ 74 0 _ _ _ _ 93.27 0 0 0 34 5 U 5 3 2 0 0 .30 0 u 0 1525 0 236 111 0 0 0 0 .35 - - - - 732 27 38 _ _ _ .40 0 u 0 680 772 14 263 17 15 0 0 .45 - - - - 782 U 282 _ _ _ _ .50 0 0 0 22 396 15 445 540 0 0 0 .55 - - - - 1590 109 1365 . _ .60 0 0 0 241 523 132 286 _ _ _ _ .65 - - - - 157 69 _ . _ _ _ .70 0 0 1039 82 45 380 120 _ _ _ _ .75 - - - - 71 _ _ _ _ _ _ .80 - - - 168 57 69 268 _ _ _ _ .90 - - - 626 - - 6 _ _ _ _ 24 Table 4. --Record of jack mackerel eggs, 1952 Cruise number Station 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 97.30 0 U 0 _ 0 0 0 0 0 _ 0 .32 0 0 0 942 - U 51 0 0 0 0 .35 - - - - 103 71 - - - - - .40 0 U 0 1168 472 1052 1130 U 198 0 0 .45 - - - - 2090 Ll 4620 - - - - .50 0 0 0 4730 134 371 455 248 11 0 0 .55 - - - - 195 202 859 - - - - .60 0 0 494 1290 261 849 2410 - - - - .65 - - - - 28 522 - - - - - .70 7 448 1231 U 36 35 57 - - - - .75 - - - - 35 - - - - - - .80 - - - 37 756 76 20 - - - - .90 - - - 20 183 107 6 - - - - 100.29 0 - 0 0 0 0 0 0 0 0 0 .30 - U 0 0 u 0 0 0 0 0 0 .35 - - - - - 149 0 - - - - .40 0 0 0 1072 106 100 57 0 0 0 0 .45 - - - - U 180 66 - - - - .50 0 31 0 696 1262 151 609 0 12 0 0 .55 - - - - 696 56 70 - - - - .60 - 227 1769 2650 421 201 90 0 0 0 0 .65 - - - - 116 71 - - - - - .70 0 0 756 453 0 15 71 0 0 0 0 .75 - _ - - 17 - - - - - - .80 0 1190 1375 452 72 385 0 0 0 0 0 .90 331 U 299 U 480 116 14 - - - - .100 - - - 82 - 96 65 - - - - 103. 3Q _ - - 9 U 0 - 0 0 0 0 .35 - - - 505 59 5 - 9 3 0 0 .40 - _ - 48 3440 U - 0 0 0 0 .45 _ - - - 3510 - - - - - - .50 - - - 1015 264 u - - - - - .55 - - - - NQ 11 - - - - - .60 - - - 0 50 u - - - - - .65 _ _ - - 27 73 - - - - - .70 - - - 343 41 38 - - - - - .75 - - - - 368 227 - - - - - .80 - - - 63 358 60 - - - - - .90 - - - 101 193 107 - - - - - 25 Table 4. — Record of jack mackerel eggs, 1952 Cruise and number Station 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 105.32 0 0 0 _ _ _ 0 _ _ _ _ .35 85 0 0 - - - 205 - - - - .40 0 0 0 - - - 438 - - - - .45 - - - - - - 99 - - - - .50 0 27 0 - - - 171 - - - - .55 - - - - - - 102 - - - - .60 0 4460 333 - - - 45 - - - - .70 0 891 148 - - - 153 - - - - .80 0 0 - - - - 115 - - - - .90 - - - - - - 253 - - - - 107.32 - - - 0 0 0 - 6 0 0 0 .35 - - - 118 0 269 - 0 5 0 0 .40 - - - 0 91 412 - 0 0 - - .45 - _ - - 374 114 - - - - - .50 - - - 251 850 43 - - - - - .55 - - - - - 12 - - - - - .60 - - - 205 426 U - - - - - .65 _ _ _ - - 183 - - - - - .70 - - - 875 236 91 - - - - - .80 - - - 141 508 51 - - - - - 110.33 0 0 - 0 4 0 0 0 0 0 0 .35 0 0 0 0 65 U 3 0 0 0 0 .40 0 0 0 126 48 137 U 0 0 0 0 .45 - - - - 79 504 - - - - - .50 0 0 0 56 112 435 5 0 0 0 0 .55 - - - - - 144 - - - - - .60 - 0 2 U 133 81 3 0 0 0 0 .65 - - - - - U - - - - - .70 0 u 4 121 3779 203 72 - - - - .80 0 0 - 1036 43 78 0 - - - - .90 0 0 - 356 160 45 0 - - - - 113.30 - 0 43 0 0 0 0 0 0 0 0 .35 - 0 0 0 117 0 6 0 - - 0 .40 - 0 0 0 21 229 0 0 0 0 0 .45 - - - - 94 118 0 - - - - .50 - 0 0 - 245 20 0 - - - - .55 - - - - 124 490 23 - - - - .60 - 0 36 99 19 29 0 - - - - .65 - - - 44 41 22 - - - - - .70 - 0 - 183 9 114 0 - - - - 26 Table 4. — Record of jack mack erel eggs, 1952 Station Cruise number 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 115.27 0 _ _ «. _ _ - U _ _ _ .30 - - - - - - - U - - - .35 0 - - - - - - u - - - .40 0 - - - - - - - - - - .50 0 - - - - - - - - - - .60 0 - - - - - - - - - - .70 0 - - - - - - - - - - 117.26 - 0 0 0 0 0 0 0 0 0 0 .30 - 0 0 0 0 0 0 0 0 0 0 .35 - 0 3 0 0 0 0 0 - - 0 .40 - 0 0 0 0 0 40 0 0 0 0 .45 - - - 16 2 0 15 - - - - .50 - 0 0 20 121 0 0 - - - - .55 - - - 6 18 84 0 - - - - .60 - u 14 0 5 U 0 - - - - .65 - - - 0 18 38 - - - - - .70 - 0 - 0 13 53 3 - - - - 120.25 0 0 0 7 0 0 0 12 0 0 0 .30 0 0 0 0 0 0 0 0 0 0 0 .35 0 0 0 0 0 0 0 0 0 0 0 .37 - - - - - - U - - - - .40 - - - 0 0 0 - - - - - .45 0 0 0 9 305 0 0 0 0 0 0 .50 0 0 0 0 9 0 0 0 0 0 0 .55 - - - 15 15 13 0 - - - - .60 0 0 0 69 81 13 0 0 0 0 0 .65 _ - - 0 39 121 - - - - - .70 0 0 0 15 100 0 0 0 0 0 0 .80 0 0 0 68 110 0 0 0 0 0 0 .90 0 0 142 U 0 0 0 0 0 0 0 123.37 0 0 0 0 0 0 0 0 0 0 0 .40 0 0 0 0 0 0 0 0 0 0 0 .45 - - - 0 0 0 0 - - - - .50 0 0 0 40 36 25 0 0 0 0 0 .55 - - - 39 606 49 - - - - - .60 0 0 249 61 16 5 0 - - - - 127.34 0 - 0 U 0 0 0 0 0 0 0 .40 0 - 0 0 0 0 0 0 0 0 - .45 - - - 0 0 0 0 - - - - .50 0 - 0 0 0 0 0 0 0 0 - .55 - - - 0 0 0 - - - - - .60 0 0 0 0 0 27 0 0 Table 4, — Record of jack mackerel eggs, 1952 Cruise number Station 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 130.30 0 0 0 U 0 0 0 U 0 0 0 .35 0 0 0 0 0 0 0 0 0 0 0 .40 0 0 0 0 0 0 0 0 0 0 0 .45 - - - u 0 0 0 - - - - .50 0 0 0 3 0 0 0 0 0 0 0 .55 - - - 27 0 0 - - - - - .60 0 0 0 0 0 0 0 0 0 0 0 .70 0 - - - - - - - - - - .80 0 - - - - - - - - - - 133.25 0 0 0 0 0 u - 0 0 0 0 .30 0 0 0 0 0 0 0 0 0 0 0 .35 - - - 0 0 0 0 - - - - .40 0 0 0 0 0 0 0 - - - - .45 - - - 0 0 0 0 - - - - .50 0 0 0 0 0 NQ u - - - - .60 0 - - 0 - - - - - - - 137.23 0 0 0 0 0 11 0 0 0 0 0 .30 0 0 0 0 0 0 0 0 0 0 0 .35 - - - 0 0 0 0 - - - - .40 0 0 0 0 0 0 0 - - - - .45 - - - 0 0 0 0 - - - ~ .50 0 0 u 0 0 0 0 - - - - .60 0 - - 0 - - - - - - - 140.30 - 0 - - - - - - - - - .35 - 0 - - - - - - - - - .40 - 0 - - - - - - - - - .50 - 0 - - - - - - - - - 143.26 - 0 - - - - - - - - - .30 - 0 - - - - - - - - - .35 - 0 - - - - - - - - - 147.20 - 0 - - - - - - - - - .25 - 0 - - - - - - - - - .30 - 0 - - - - - - - - - 150.19 - 0 - - - - - - - - - .25 - 0 - - - - - - - - - .30 - 0 - - - - - - - - - .40 - 0 - - - - - - - - - Total 423 8116 14148 23695 62303 27407 19034 1506 729 0 28 RECORD OF JACK MACKEREL EGGS, 1953 Spawning began in February. The peak came in April this year. No eggs were collected in September but a small number were taken during October. Half of the eggs were taken from off northern Baja California (station lines 97-107) with the two adjacent regions contributing 46 percent. Of the four years studied, this one has the lowest number of eggs off California, indicating a more southern distri- bution than usual. The quantitative distribution (annual standard haul totals) is given in figure 5. 29 JACK MACKEREL EGGS 953 CUMULATIVE TOTALS I - 30 31-300 ^P 301-3000 ^M OVER 3000 STATIONS OCCUPIED Figure 5, — Jack mackerel eggs 1953: distribution and relative abundance. 30 Table 5, — Record of jack mackerel eggs, 1953 Cruise number Station 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 60.55 --_ 00000---- .60 _-_ 00 96 00---- .65 ----u 33 ------ .70 -_- 00- 0 23---- .80 -__ 00- 0 44---- .90 -_- 00- 0 15---- .100---- 0- 00---- 63.52 --- 00500---- .55 -__ OU 00----- .60 --__ 00------ .65 --__ 00------ 67.50 --_ 0- 0- 0---- .55 - - _ u - 0 16 57 - - - - .60 ----_ 60----- .65 -___ 0 62 18 0---- 70.51 --- 0000----- .55 - _ _ 0 0 70 18 46 - - - - .60 -__ 80 55 60---- .65 ---- 0 798------ .70 -__ 00060---- .80 - _ _ 0 U 63 10 16 - - - - .90 --_ 00 37 ------ .100---- 0 85------ 73.50 - _ _ u 0 14 0 0 - - - - .55 --__ 0 66 0----- .60 _ _ _ 0 0 127 13 0 - - - - 77.50 -__ 00800---- .55 ___ 00 84 00---- .60 - _ - - 0 123 60 - - - - - .65 _ - - 0 0 156 483 0 - - - - 80.51 00000000---- .55 NQOOOOU 00---- .60 0 0 0 0 18 610 47 15 - .70 0 0 0 0 0 204 418 3 - .80 0 0 0 0 1432 12 0 13 - .90 0 - 0 0 1020 69 0 0 - .100 0 - 0 0 238 21 0 0 - - - - .110 ---u 3------- .120 - - - 192 129 - .130--- 0 15 ------- .145 - - - 152 65 - .160--- 00------- 81.46 ---_____ 0- 00 82.47 ________ 00 00 31 Table 5. — Record of jack mackerel eggs, 1953 Cruise number Station 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 83.40 _ _ 0 ^ 0 0 0 0 0 0 0 0 .43 0 0 0 0 0 0 0 0 0 0 0 0 .48 0 0 0 0 17 7 0 0 0 0 0 0 .51 0 0 0 0 3 0 0 0 0 0 0 0 .55 0 0 0 0 0 0 0 0 0 0 0 0 .60 0 0 0 0 11 44 2310 0 - - 0 0 .70 - - - 0 0 378 - - - - - - .80 - - - u 676 700 - - - - - - .90 - - - 0 194 392 - - - - - - 85.39 0 0 0 0 25 0 U 0 0 - 0 0 .40 0 0 0 0 0 0 77 0 0 - 0 0 .45 0 0 0 0 0 U 12 0 0 - 0 0 .50 0 0 0 0 0 0 0 0 0 - 0 0 .55 0 0 0 0 NQ 43 U 0 0 - 0 - .60 0 0 0 0 100 500 1490 10 - - 0 - 87.35 0 0 0 0 10 267 NQ 0 0 - 0 0 .40 u 0 0 0 0 0 389 0 0 - 0 0 .45 - 0 0 0 0 11 120 0 0 - 0 0 .50 - 0 0 0 46 U 0 0 0 - - 0 .55 0 0 0 u 112 u 21 0 0 - 0 0 .60 0 0 - 0 7660 159 11 18 0 - 0 - .70 - - - 0 262 U - - - - - - .80 - - - 0 89 - - - - - - - .90 - - - 0 221 117 - - - - - - 90.28 0 0 0 0 0 0 0 - - 36 - 0 .30 0 0 0 0 0 0 24 0 - 0 - 0 .37 0 0 0 5 - 0 204 19 - 0 - 0 .45 0 0 0 0 246 88 17 24 - 0 - 0 .50 - - 0 - 124 19 6 42 - 0 - 0 .53 0 0 - - - - - - - - - - .55 - - 0 0 184 56 757 U - 0 - 0 .60 0 0 0 0 118 26 179 6 - 0 - 0 .70 0 0 0 u 306 NQ 158 0 - 0 - - .80 0 0 0 9 4650 126 - - - - - - .90 0 - 0 u 658 U - - - - - - .100 - - - 0 79 L - - - - - - .110 - - - 3 169 - - - - - - - .120 - - - 37 224 - - - - - - - .130 - _ - 252 55 _ - - - - - - .145 - - - 157 94 - - - - - - - .160 - - - 0 162 - - - - - - - 93.27 0 0 - 0 U 0 0 0 - 3 - 0 .30 0 0 0 0 15 222 u 0 - 0 - 0 32 Table 5, — Record of jack mackerel eggs, 1953 r.rii ise mi mhftr Station 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 93.35 _ _ _ 0 276 410 259 11 «, _ _ . .40 0 0 NQ 0 69 522 1062 8 - 0 - 0 .45 - - - 0 1880 345 638 - - - - - .50 0 0 0 0 2490 68 122 0 - 0 - 0 .55 - _ - 0 - 24 - - - - - - .60 NQ 0 - 0 1358 510 - - - - - - .70 - - - 0 - 745 - - - - - - .80 - - - 386 - 118 - - - - - - .90 - - - 57 - 37 - - - - - - 97.30 0 0 0 0 24 28 0 0 - 0 - 0 .32 0 0 - - - - - - - - - - .35 - - 0 0 512 479 144 14 - 0 - 0 .40 0 0 0 99 570 852 147 0 - 0 - 0 .45 _ - - 227 1356 616 40 - - - - - .50 0 0 - 925 3650 5460 355 137 - 0 - 0 .60 0 0 - 33 584 1220 - - - - - - .70 - _ - 0 376 183 - - - - - - .80 - - - 185 - 198 - - - - - - .90 - - - 626 - 123 - - - - - - 100.29 u 0 0 0 5 0 0 0 - 0 - 0 .30 0 0 17 0 0 0 122 0 - 0 - 0 .35 - - - 1390 59 336 0 50 - - - - .40 0 0 4280 37 102 85 24 112 - 3 - 0 .45 - - - 98 252 310 93 - - - - - .50 0 0 148 46 180 1390 1360 27 - 11 - 0 .55 - - - 24 331 964 - 10 - - - - .60 0 0 0 0 440 426 49 0 - 0 - 0 .70 0 0 101 177 224 716 52 0 - 0 - 0 .80 0 1360 90 11 63 103 24 U - - - 0 .90 0 - - 24 81 57 - - - - - - 103.30 - - - 0 2781 0 0 0 - 0 - 0 .35 - _ - 1675 2321 0 u LI - 0 - 0 .40 - - _ 82 492 1260 812 127 - 0 - 0 .45 _ _ - 125 1730 201 - - - - - - .50 _ - - U 588 701 - - - - - - .55 - - - 127 416 1930 - - - - - - .60 - _ - 56 120 999 - - - - - - .70 - - - 92 36 146 - - - - - - .80 - - - 512 327 260 - - - - - - .90 - - - 16 269 34 - - - - - - 105.32 0 0 0 - - - - - - - - - .35 0 0 0 - - - - - - - - - .40 0 0 1971 - - - - - - - - - 33 Table 5. — Record of jack mackerel eggs, 1953 Cruise number Station 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 105.50 0 332 2880 _ _ _ _ _ _ _ _ . .60 0 0 5110 - - - - - - - - - .70 0 - U - - - - - - - - - .80 0 - 501 - - - - - - - - - 107.32 - - - 0 386 0 0 U - 0 - 0 .35 - - - 4350 296 202 228 0 - 0 - 0 .40 - - - 2641 326 1068 1750 327 - 0 - 0 .45 - - - 617 79 1615 - - - - - - .50 - - - 86 198 56 - - - - - - .55 - - - 327 473 36 - - - - - - .60 - - - U U 842 - - - - - - .70 - - - 16100 U 725 - - - - - - .80 - - - 2220 1030 - - - - - - - .90 - - - 855 35 - - - - - - - 110.33 - 0 732 131 NQ 40 0 0 - 0 - 0 .35 - 0 371 472 159 509 0 70 - 0 - 0 .40 - 0 724 4560 U no 262 16 - 0 - 0 .45 - - - 1620 118 44 - - - - - - .50 0 862 576 1930 147 48 0 37 - 0 - 0 .55 - - - 2350 65 52 - - - - - - .60 u 470 1035 1760 55 18 24 U - 0 - 0 .70 u - 1138 406 ■ 47 0 - - - - - - .80 0 - - 4450 63 - - _ - - - - .90 - - - 165 306 - - - - - - - 113.30 - 0 U 44 0 4 0 0 0 0 - 0 .35 0 0 0 1610 11 U 106 0 0 0 - 0 .40 - 0 0 3980 166 71 46 0 - 0 - 0 .45 - - 0 362 60 600 - - - - - - .50 0 17 48 1250 321 15 - - - - - - .55 - - 79 493 6 3 - - - - - - .60 - 1015 158 99 55 696 - - - - - - .70 - - - 353 U 0 - - - - - - 117.26 - 0 0 0 0 0 0 0 0 0 - 0 .30 - 0 0 0 0 0 0 0 0 0 - 0 .35 - 0 0 0 0 0 52 u 0 0 - - .40 0 0 0 41 0 229 2 0 0 0 - - .45 - - 0 824 1035 89 - - - - - - .50 u 625 19 130 459 298 - - - - - - .55 - - 0 165 128 383 - - - - - - .60 - 175 646 192 93 153 - - - - - - .70 - - - 930 164 0 - - - - - - 120.25 0 0 0 0 0 0 U 0 0 0 - 0 .30 0 0 0 0 0 0 0 u 0 0 - 0 34 Table 5. — Record of jack mackerel eggs, 1953 Cruise number Station 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 120.35 0 0 0 13 194 0 0 0 0 0 _ 0 .40 - - 0 7 12 U - - - - - - .45 0 0 0 33 171 0 0 0 - 0 - 0 .50 0 112 0 730 2160 u 7 u - 0 0 0 .55 - - 0 276 153 0 - - - - - - .60 u 116 0 348 422 0 3 0 - 0 - 0 .70 0 0 - 0 60 0 0 0 - 0 - 0 .80 0 0 - 43 71 0 0 0 - 0 - 0 .90 - - - 0 229 17 0 0 - 0 - 0 123.37 0 0 0 0 0 0 U 0 - 0 - 0 .40 - 0 0 0 0 32 0 0 - 0 - 0 .45 - 0 0 0 404 0 0 0 - - - - .50 - 0 0 0 2420 0 0 0 - 0 - 0 .55 - - 0 0 147 6 - - - - - - .60 - - 0 0 157 6 - - - - - - 127.34 0 0 0 0 0 0 0 0 - 0 - 0 .40 - 0 0 U 0 0 0 0 - 0 - 0 .45 - 0 0 0 126 0 0 0 - - - - .50 - 0 0 0 525 495 0 0 - 0 - 0 .55 - - 0 0 0 0 - - - - - - .60 - - 0 0 29 0 - - - - - - 130.30 - 0 0 0 0 0 - 0 - 0 - 0 .35 0 0 0 0 0 0 0 0 - 0 - 0 .40 u 0 0 0 0 4 0 0 - 0 - 0 .45 - 0 0 0 482 3 0 0 - - - - .50 - 0 0 0 0 14 0 0 - 0 - 0 .55 - - 0 0 0 34 - - - - - - .60 0 0 0 0 0 0 0 0 - NQ - 0 133.25 0 0 0 0 0 0 0 0 - 0 - 0 .30 0 0 0 0 U 0 0 0 - 0 - 0 .35 - - 0 0 0 0 0 0 - - - - .40 0 0 0 0 0 0 0 0 - 0 - 0 .45 - - 0 0 0 7 - - - - - - .50 0 - 0 0 0 7 - - - - - - .55 - - - 0 0 - - - - - - - .60 - - - 0 0 - - - - - - - 137.23 0 0 0 0 0 0 0 0 - 0 - 0 .30 0 u 0 0 U 0 0 0 - - - 0 .35 - - 0 0 u 0 - - - - - - .40 0 - 0 0 0 0 - - - - - - .45 - - 0 0 u 5 - - - - - - .50 0 - 0 0 0 0 - - - - - - .55 - - - 0 0 - - - - - - - ,60 - - - 0 0 - - - - - - - Total 0 5084 20624 64808 57435 36411 14653 1297 0 53 0 0 35 RECORD OF JACK MACKEREL EGGS, 1954 A few eggs were taken in January of this year. Over a third of the eggs were taken in May, the peak month. There is some un- certainty as to when spawning ceased since there were no cruises during September and November. However, only a negligible number of eggs were taken during October and records from previous years are consistent with the supposition that no spawning occurred after October. Like 1951, over half of the spawning occurred off California with the largest proportion occurring off southern California. A relatively large number of eggs taken off southern Baja California (station lines 123-157) is indicative of the wide dispersal of eggs during this year. The quantitative distribution (annual standard haul totals) of jack mackerel eggs is given in figure 6. 36 JACK MACKEREL EGGS 1954 CUMULATIVE TOTALS 1-30 31 - 300 ^H OVER 3000 o STATIONS OCCUPIED Figure 6. --Jack mackerel eggs, 1954: distribution and relative abundance. 37 Table 6. --Record of jack mackerel eggs, 1954 Cr uise n umber Station 5401 5402 5403 5404 5405 5406 5407 5408 5410 5412 50,47 _ _ _ _ _ 0 _ _ _ _ .50 - - - - - U - - - - .60 - - - - - 12 - - - - .70 - - - - - 0 - - - - .80 - - - - - 0 - - - - .90 - - - - - 0 - - - - .100 - - - - - u - - - - 53.52 - - - - - 0 - - - - .55 - - - - - 0 - - - - .65 - - - - - 18 - - - - 57.51 - - - - - 0 - - - - .55 - - - - - 0 - - - - .65 - - - - - 0 - - - - 60.55 - - - 0 0 0 U 0 - - .60 - - - 0 0 0 0 u - - .70 - - - 0 0 404 134 0 - - .80 - - - 0 u 0 59 0 - - .90 - - - 0 180 71 148 Ll - - .100 - - - - - 43 7 0 - - 63.52 - - - 0 0 0 0 0 - - .55 - - - 0 0 0 21 0 - - .65 - - - - - 0 - - - - 67.50 - - - 0 0 0 0 0 - - .55 - - - 0 0 0 0 0 - - .65 - - - - - 482 0 0 - - 70.51 - - - - 0 34 0 0 - - .55 - - - 0 5 0 17 L - - .60 - - - 0 40 750 u 0 - - .70 - - - 0 340 22 0 u - - .80 - - - - 400 6 0 0 - - .90 - - - 0 5 20 - - - - .100 - - - - - U - - - - 73.50 - - - 0 0 U HQ 0 - - .55 - - - - - - - 0 - - .60 - - - 0 1165 74 Ny u - - 77.50 0 0 0 0 Ny 0 Ll 31 0 - .55 0 0 0 0 28 2 82 0 0 - .65 - - - 0 0 N(^ 285 U - - 80.51 0 0 0 0 0 0 0 0 0 0 .55 0 0 0 7 0 22 0 0 0 0 .60 0 0 0 0 19 863 73 0 0 0 .70 0 u 0 0 518 Ny 60 u u 0 .80 0 0 0 0 1220 33 157 0 0 0 38 Table 6. — Record of jack mackerel eggs, 1954 Cruise number Station 5401 5402 5403 5404 5405 5406 5407 5408 5410 5412 80.90 0 _ 0 7 581 45 0 0 U 0 .100 0 - - - - 347 - 0 - - .110 0 - - - - - - - - - 82.47 0 0 u 0 0 0 0 0 0 0 83.40 0 0 0 0 0 U 0 0 0 0 .43 0 0 0 0 0 u 0 0 0 0 .48 0 u 0 0 u 24 0 5 u 0 .51 0 u 0 0 0 1 0 0 0 0 .55 0 0 0 0 8210 0 u 0 0 0 .60 0 0 0 0 1032 4250 245 9 0 0 .70 - - - 0 39 602 - - - - .80 - - - 49 4730 137 - - - - .90 - - - 0 87 41 - - - - 85.39 - 0 0 0 0 0 NQ 0 0 0 .40 0 0 0 0 0 - 23 0 0 0 .45 0 0 0 0 23 1190 0 u 0 0 .50 0 0 0 0 U 2870 0 u 0 0 .55 0 0 0 0 610 U 15 0 0 0 .60 0 0 0 0 2140 2130 127 u 0 0 87.35 0 0 u 0 0 0 13 0 0 0 .40 0 0 0 0 0 0 0 9 NQ 0 .45 0 0 0 0 25 231 0 0 0 0 .50 0 0 0 0 79 143 0 0 u 0 .55 0 0 0 0 100 970 0 0 u 0 .60 0 0 0 126 5400 394 0 0 0 0 .70 - - - 3250 232 - - - - - .80 - - - 424 14 92 - - - - .90 - - - 324 42 39 - - - - 90.28 0 u 0 0 0 6 0 0 0 0 .30 0 0 0 0 0 U 0 2 0 0 .33 - - - - 0 0 - - - - .37 0 0 0 0 0 0 u 0 0 0 .41 - - - - 0 0 - - - - .45 0 0 0 0 26 0 0 62 u 0 .50 - - - - 7 812 - - 0 0 .55 0 0 0 0 33 297 176 12 u - .60 0 0 0 536 73 236 795 8 0 0 .70 0 0 0 1030 368 313 0 60 0 0 .80 0 0 - 231 185 91 - - - - .90 0 - - 46 191 - - - - - .100 0 - - - - - - - - - .110 0 - - - - - - - - - 39 Table 6. — Record of jack mackerel eggs, 1954 Cr uise n umber Station 5401 5402 5403 5404 5405 5406 5407 5408 5410 5412 93.27 0 0 0 0 0 0 0 U 0 0 .30 0 0 0 0 U 15 0 0 0 0 .35 - - - 0 0 0 0 24 - - .40 0 0 0 0 0 Ny 18 0 3 0 .45 _ - - 0 10 0 131 U 0 - .50 0 0 - 0 176 36 985 94 0 0 .55 - - - 558 522 103 - - 3 - .60 0 0 - 1820 200 259 - - - - .70 _ - 0 2870 212 31 - - - - .80 _ - - 444 51 - - - - - .90 - - - 237 20 NO - - - - 97.30 0 0 0 0 0 0 312 0 0 0 .32 0 0 0 - 7 0 0 0 0 0 .36 - - - - 55 145 - - - - .40 0 0 0 0 31 91 5 34 0 0 .45 - - - 0 584 2990 U 6 0 - .50 0 0 0 u 51 84 24 9 0 0 .55 - - - 258 46 223 - - 0 - .60 0 0 0 3550 37 173 - - - - .70 - - 2420 1020 133 40 - - - - .80 - - - 961 132 33 - - - - .90 - - - 231 36 98 - - - - 100.29 0 0 0 0 0 0 0 0 0 0 .30 0 u 0 3 3 0 0 136 0 0 .35 - - 0 69 23 0 3 0 - - .40 0 26 44 0 218 0 0 0 0 0 .45 - - 0 116 337 0 267 0 0 - .50 0 0 539 260 57 0 88 19 0 NQ .55 _ - 799 626 366 92 - - 0 - .60 0 0 585 225 385 57 79 6 0 0 .70 0 129 1990 99 52 26 31 0 0 0 .80 0 524 1350 61 55 27 14 - 0 NQ .90 0 - 174 524 415 19 - - 0 0 .100 - - - 903 84 - - - - - 103.30 0 0 0 12 0 0 0 0 0 0 .35 0 15 46 0 0 u 0 0 0 0 .40 0 7 699 795 1419 52 0 0 0 0 .45 - 0 0 193 952 97 - - - - .50 0 30 U 1220 816 25 - - - - .55 - - 0 298 157 39 - - - - .60 0 204 180 321 336 0 - - - - .70 - - - 114 59 0 - - - - .80 - - - 122 17 25 - - - - .90 - - - NQ 54 - - - - - 40 Table 6, --Record of jack mackerel eggs, 1954 C; ruise n umber Station 5401 5402 5403 5404 5405 5406 5407 5408 5410 5412 107.32 0 0 73 0 0 0 0 0 0 0 .35 0 0 97 0 0 26 U 0 0 0 .40 0 45 0 44 39 436 0 0 0 0 .45 - 86 0 n 372 0 - - - - .50 - 4610 0 298 156 34 - - - - .55 - - 23 546 U 70 - - - - .60 0 225 264 112 0 7 - - - - .70 - - - 244 157 82 - - - - .80 - - - 135 158 - - - - - 110.33 0 0 25 584 1400 92 0 0 0 0 .35 0 0 0 807 591 U 0 0 0 0 .40 0 u 0 292 51 15 16 0 0 0 .45 - 0 24 69 143 27 44 0 0 - .50 0 0 87 194 455 36 52 0 0 0 .55 - - 0 33 91 U - - 0 - .60 0 57 16 34 298 57 34 0 0 0 .70 11 - 0 193 70 U - - - - .80 0 - U 60 14 42 - - - - .90 0 - - 0 14 - - - - - .100 0 - - - - - - - - - 113.30 0 3 0 0 0 0 0 24 0 0 .32 - - 0 41 0 0 - - - - .35 0 0 0 374 18 u 0 0 0 0 .37 - - 195 527 22 6 - - - - .40 0 0 0 52 148 26 15 0 0 0 .42 - - 0 U 58 Li - - - - .45 - 0 0 134 12 U - - - - .47 - - 0 178 19 0 - - - - .50 0 7 66 652 0 3 - - - 0 .55 - _ 0 20/' 36 18 - - - - .60 - 166 1118 13 0 51 - - - 0 .70 - - - 135 1025 37 - - - - 117.26 0 - 0 5 0 U 0 0 0 0 .28 - - 0 0 0 0 - - - - .30 0 V 0 0 0 U 0 0 0 , 0 .32 - - 0 0 U 0 - - - - .35 0 0 0 0 0 0 0 8 0 0 .37 - - 0 U 0 U - - - - .40 0 261 0 63 0 0 0 0 0 0 .42 - - 0 0 33 0 - - - - .45 - 0 0 0 64 0 - - - - .47 - - 0 0 0 0 - - - - .50 0 0 n 0 0 0 - - - 0 41 Table 6. --Record of jack mackerel eggs, 1954 Cruise number Station 5401 5402 5403 5404 5405 5406 5407 5408 5410 5412 117.55 _ 0 0 0 21 48 _ _ _ _ .60 - 0 0 17 0 0 - - - 0 .70 - - - 115 71 342 - - - - 120.25 0 0 u 0 0 U 0 0 0 0 .27 - - NQ 0 0 0 - - - - .30 0 0 0 0 0 0 0 u 0 0 .32 - - 0 0 0 0 - - - - .35 0 0 0 0 0 0 0 0 0 0 .37 - 0 0 0 0 U - - - - .40 - 0 0 0 u 0 - - - 0 .42 - 0 0 0 0 0 - - - - .45 0 0 0 u 0 0 0 0 0 0 .47 - - 0 u 0 u _ - - _ .50 0 0 0 u 0 u 0 0 0 0 .55 - 0 0 u 0 112 - - :MQ - .60 0 0 0 0 36 U 0 0 0 0 .70 0 0 12 174 u 83 15 0 0 0 .80 0 0 0 - 21 U 0 0 0 0 .90 - - 0 - 200 87 0 0 0 0 .120 0 - - - - - - - - - 123.37 0 0 0 0 0 0 0 0 0 0 .40 0 u 0 0 0 0 0 0 0 0 .42 - 0 0 u 0 0 - - - _ .45 - 0 0 u 24 0 0 0 0 0 .47 - - c u 1005 0 - - - - .50 0 0 0 u 176 0 0 0 0 0 .55 - - 0 61 2060 0 - - 0 0 .60 0 - 0 0 1235 0 - - - - 127.34 0 0 0 0 0 0 0 0 Nl,' 0 .37 - - 0 L 0 0 - - - .40 0 0 u U 29 Nv^ 0 0 0 0 .42 - - 0 u 45 0 - - - - .45 - 0 0 u 66 3 0 0 0 0 .47 - - 0 55 5 0 - - - - .50 0 0 0 68 0 0 0 0 0 u .55 - - 0 232 0 0 - - 0 0 .60 0 - 0 23 0 0 - - - - 130.30 0 0 0 0 0 0 0 0 0 0 .35 0 0 0 0 0 0 0 0 0 0 .40 0 0 0 0 0 0 0 0 0 0 .45 - 0 0 645 0 0 0 0 0 - .50 0 0 0 403 0 0 0 0 0 0 42 Table 6, --Record of jack mackerel eggs, 1954 Cruise number Station 5401 5402 5403 5404 5405 5406 5407 5408 5410 0 5412 130.55 . 0 0 0 0 0 . _ .60 0 0 0 0 0 0 0 0 0 0 ,110 0 - - - - - - - - _ 133.25 0 0 0 0 0 0 0 0 0 0 .30 0 0 0 0 0 0 0 u 0 0 .35 - 0 0 1450 0 0 0 0 _ - ..40 0 0 0 0 0 u 0 0 _ - .45 - - 0 0 0 0 - _ - . .50 0 - 0 0 0 0 - _ _ _ .60 - - - 0 0 - _ _ _ _ 137.23 0 0 0 0 0 0 0 0 0 0 .30 24 0 0 0 0 0 0 0 0 0 .35 - - 0 0 0 0 - _ _ _ .40 0 - 0 0 0 0 _ _ _ _ .45 - - 0 0 0 0 - . . » .50 0 - 0 0 0 0 - _ _ _ .60 - - - 0 0 _ • . _ _ .140 0 - _ - . _ _ _ . ^ 140.30 0 - _ - - _ _ _ _ 0 .35 0 - - - - _ _ - _ 0 .40 0 - - - - _ — _ _ 0 .50 0 - - - - - » _ _ .110 0 - - - _ _ _ _ _ _ 143.26 0 - - _ _ _ _ _ _ 0 .30 0 - - - _ _ _ _ _ 0 .35 0 - - - _ _ _ _ _ 0 147.20 0 - - - _ _ . _ « 0 .25 0 - - - - _ _ — _ 0 .30 0 - - - _ _ _ _ _ 0 .90 0 - - _ _ _ ^ _ ^ 150.19 0 - - _ _ _ _ _ _ 0 .25 0 - - _ - _ _ _ . 0 .30 0 - - _ _ - . _ _ 0 .40 0 - - - - _ ^ _ _ .50 0 - - _ _ » _ _ _ _ .60 0 - - _ _ . _ _ _ ^ 153.16 - _ _ _ _ _ _ _ 0 .20 - - _ _ _ _ _ _ _ 0 .30 - _ _ _ . _ ... _ _ 0 157.10 - - - _ . _ _ _ _ 0 .20 - - - _ _ _ _ _ _ 0 .30 - - - - - - - - - 0 Total 35 6395 10826 33209 46693 24637 4570 558 43 BIBLIOGRAPHY AHLSTROM, ELBERT H. 1943. Studies on the Pacific pilchard or sardine (Sardinops caerulea) 4. Influence of temperature on the rate of development of pilchard eggs in nature. U. S. Dept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.: No. 23, 26 pp. 1953. Pilchard eggs and larvae and other fish larvae. Pacific coast, 1951. U. S. Dept. Interior, Fish and Uildlife Service, Spec.' Sci. Rept.: Fisheries No. 102, 55 pp. 1954. lacific sardine (pilchard) eggs and larvae and other fish larvae Pacific coast, 1952. U. 5. Uept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.: Fisheries No. 123, 76 pp. AHLSTROr.1, :iLB::RT H. and DAVID KRAMER 1955. Pacific sardine (pilchard) eggs and larvae and other fish larvae Pacific coast, 1953. U. 5. Dept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.: Fisheries No. 155, 74 pp. 1956. Sardine eggs and larvae and other fish larvae. Pacific coast, 1954. U. S. Dept. Interior, Fish and hildlife Service, Spec! Sci. Rept.: Fisheries No. 186, 79 pp. FARRIS, DAVID A. The distribution, abundance and early mortality of jack mackerel, Trachurus symmetrlcus. eggs and larvae. Unpublished. STAFF, SOUTH PACIFIC FISHERY INVESTIGATIONS 1952. Zooplankton volumes off the Pacific coast, 1951. U. S. Dept. Interior, Fish and Uildlife Service, Spec. Sci. Rept.: Fisheries No. 73, 37 pp. 1953. •Zooplankton volumes off the Pacific coast, 1952. U. S. Dept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.: Fisheries No. 100, 41 pp. 1954. Zooplankton volumes off the Pacific coast, 1953. U. S. Dept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.: Fisheries No. 132, 38 pp. 1955. ''ooplankton volumes off the Pacific coast, 1954. U. S. Dept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.: Fisheries No. 161, 35 pp. TflRAILKILL, JAMES R. 1956. Relative areal -zooplankton abundance off the Pacific coast. U. S. Dept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.: Fisheries No. 188, 85pp. INT-DUP. SEC, WASH., D.C, ^ac.0 6 44 MBL WHOI Libraryr Se'lji's Hl!ll!!l! Il!!llll|!!',l lllll: i i 5 W riSE 01263