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PACIFIC SARDINE (PILCHARD)
EGGS AND LARVAE AND OTHER
FISH LARVAE, PACIFIC COAST - 1952
Marine Biological Laboratory
WOODS HOLE, MASS.
SPECIAL SCIENTIFIC REPORT- FISHERIES No. 123
UNITED STATES DEPARTMENT OF THE INTERIOR
FISH AND WILDLIFE SERVICE
Explanatory Note
The series embodies results of investigations, usually ofrestricted scope, intended to aid or direct management or utilisationpraotioes and as guides for administrative or legislative action. It
is issued in limited quantities for the offioial use of Federal, Stateor cooperating Agenoies and in processed form for eoonomy and to avoiddelay in publication.
sreoi
United States Department ox the Interior, Douglas McKay, SecretaryFish and Wildlife Service, John L. Farley, Director
PACIFIC SARDINE (PILCHARD) EGGS AND LARVAE AND OTHER FISH LARVAE,
PACIFIC COAST - 19S2
By Elbert H. AhlstromFishery Biologist
Special Scientific Report: Fisheries No. 123
Washington, Do C.
April, 195U
PACIFIC SARDINE (PILCHARD) EGGS AND LARVAE AND OTHER FISH LARVAE,PACIFIC COAST, 1952
The results of quantitative sampling of eggs and larvae of the Pacificsardine or pilchard ( Sardinops caerulea) off the west coast of California and
3a ja California during 1952 are given in this report, the third in a continu-
ing yearly series. Also included, are records of the larvae of 5 other
species: northern anchovy ( Engraulis mordax),jack mackerel ( Trachurus sym-
aetricus) , hake (Merluccius productus ) , Pacific mackerel ( Pneumatophorus diego),
md rockfish ( Sebastode s spp.).
The material was collected on biological-oceanographical cruises beingitade by agencies participating in the California Cooperative Oceanic Fisheries
(Investigations (formerly called the California Cooperative Sardine Research3rogram). The investigations are sponsored by the Marine Research Committee,
md are carried out cooperatively by the South Pacific Fishery Investigations
>f the United States Fish and Wildlife Service, the Scripps Institution of
oceanography of the University of California, the Bureau of Marine Fisheries
)f the California Department of Fish and Game, and the Hopkins Marine Station
)f Stanford University,
The data are presented in 8 tables. Standardized haul factors for plank-
ion hauls made on survey cruises during 1952 are listed in table I. Additional
iata concerning these hauls may be found in "Zooplankton volumes off the Paci-
ric coast, 1952", Special Scientific Report: Fisheries, No. 100; these include
sosition of occupancy, date, hour, depth of haul, and volume of water strained,
A record of all collections containing Pacific sardine eggs in 1952 is
jiven in table II. The eggs are enumerated by age (in days) since spawning,
ind for each haul the average number of eggs spawned per day has been determined.
The larvae of 3 species are enumerated by size: Pacific sardine in table
[II, anchovy in table IV, jack mackerel in table V. The larvae of the remain-
ing species are tabulated by number only: hake in table VI, Pacific mackerel
i.n table VII, and rockfish in table VIII,
It is a pleasure to acknowledge the wholehearted cooperation given by the
participating agencies. All personnel of the South Pacific Fishery Investi-
gations contributed to this project, many devoting their full time to it.
)avid Kramer, Robert Counts and James Thrailkill aided in the identifications,
enumerations , and measurements included in this report.
Figure 1.- Station plan, showing location of all stationsoccupied on routine survey cruises of theCalifornia Cooperative Oceanic FisheriesInvestigations during 1952.
-2-
AREA COVERED
The stations occupied during 1952 are shown in figure 1. Stations occu-
pied on only 1 or 2 cruises are shown as open circles; stations occupied on 3
or more cruises are indicated by black dots. Survey cruises were made monthly
in 1952, except in December. The stations occupied on each cruise made during
the year can be determined from table I (Record of standardized haul factors).
Coverage during 1952 is summarized by area in text table 1. The coverage
varied in intensity on different cruises, being most intense in the sardine
spawning areas during the main spawning season (March through June). The cover-
age north of Point Conception (station lines 40-77) was not as thorough as in
1950 or 1951. The coverage between Point Conception and Point San Juanico
(station lines 80-137) was more intensive than during any previous season. The
area off southern Baja California was visited only once (February). A compari-
son of coverage in different parts of the survey area in 1950, 1951 and 1952
is given in text table 2.
Text table 1.- Coverage during 1952, summarized by month and area
Area north of So, Calif.Pt.Conception and adj. Central Southern Total
Cruise (station lines Baja Calif. Baja Calif. Baja Calif. all
Month number 77 and above) (80-107) (110-137) (140 & below) areas
January 33^5201^/ 47 47February 34 5202 47 48March 35 5203 45 46Late March 35 5203 63
18 68 722/
23 93.,, 71
34 116^ 7246 70 63. .
15 39 45^September 41 5209 21 39 34October 42 5210 18 36 34November 43 5211 18 38 35December - -
April
Text table 2.- Comparison of intensity of coverage in differentparts of the survey area in 1950, 1951 and 1952,
North of Point Conception(20) (40-77)
Southern California andadjacent Baja Califorcia(80-107)
Central Baja. California(110-137)
Southern Baja California(140-15?)
Total
Number of stations occupied1950 '
1951 1952
376 288 193
358
METHODS OF SAMPLING
Plankton samples were obtained by obliquely hauling a conical net, 1,0meter in diameter at the mouth, from approximately 140 meters deep to the sur-face, except at shallow stations. The nets were constructed of No. 30xxx gritgauze. The depth range fished by the net during each haul is given in column8 of the extended table in Special Scientific Report: Fisheries, No. 100. Thehauls were made at a vessel speed of about 1-1/2 to 2 knots. The water enter-ing the net during a haul was measured by a current meter fastened in the mouthof the net. The volume of water strained while taking each haul in 1952 islisted in column 7 of the table referred to immediately above. The methods of
deriving volume of water strained during a haul from current meter readings,and of standardizing hauls for comparability are discussed in a preceding re-port (Ahlstrom 1953: 4-6).
SEPARATION OF FISH EGGS AND LARVAE FROM PLANKTON SAMPLES
Plankton hauls obtained on the 11 survey cruises made during 1952 totaled
1475. In working up the samples in the laboratory, the volumes of planktonwere first determined (cf . , "Zooplankton volumes off the Pacific coast, 1952?Special Scientific Report: Fisheries, No. 100), the larger samples were frac-tioned into aliquot portions (2, 4» 8 or 16), and the samples or aliquotawere examined under a low power binocular microscope in order to separate fisheggs and larvae from other plankton organisms. Approximately l/6th of thesamples were fractioned into aliquot portions before examining; the remaining
5/6ths were examined in entirety. A single aliquot portion was sorted of eachfractioned sample. Information, by cruise, on the number of samples examined
in entirety and those which were fractioned, is given in text table 4.
Text table 4.- Laboratory examination of the 1952 plankton samples.
GUIDE TO TABLES
Table I* Standardized Haul Factors (S. Factors). Adjusts each haul tothe comparable standard of 10 cubic meters of water strained permeter of depth fished (see Ahlstrom 1953: 4-6).
* . . .An asterisk following an S. factor indicates that oneor more additional occupancies of the station were made duringthe cruise. The additional S. factors for these hauls are given
in a supplement to table I.
- ... A dash indicates that the station was not occupiedduring the cruise under which it appears
NQ Haul not quantitative.
Table II. Record of Sardine Eggs, 1952.Number of normal eggs . „ . Number of normally developing sar-
dine eggs.
Total number of epgs • . . Includes all sardine eggs taken ina sample, whether norr»ml or abnormal. Srrdine eggs were classi-
fied as abnormal vrhen the embryos were stunted and misshapen. It
is not known whether such abnormalities are caused by a diseasedcondition of the eggs, by mechanical injury during collection, or
by other means.
The letters A through D are used to designate age categories
of eggs:
A . . . Eggs spawned withinB . . . Eggs spawned withinC . . . Eggs spawned withinD . * • Eggs spawned withinUnci. . Unclassified eggs.
24 hours of collection.24.1 to 48 hours of collection.
48.1 to 72 hours of collection.
72.1 to 96 hours of collection.Deteriorating eggs that could not
be classified with certainty.
* . . . Explained under Ave, n* .
n . . . Total number of eggs in sample.
Ave , n^. . . Average number of eggs spawned per day. Because
of incomplete age categories resulting from hauls having been
taken while spawning or hatching was actively taking place, not
all age categories were used in determining n', but only those
followed by an asterisk.
6
Record of SardJne larvae, 1952.Midpoint of size classes . . . The larvae are grouped into
size classes which have the following midpoints and ranges:
Midpoint(in mm.)
3.254.755.756.757.758.759.75
10.7511.75
Range(in mm.)
2.26-4.254.26-5.255.26-6.256.26-7.257.26-8.258.26-9.259.26-10.2510.26-11.2511.26-12.25
Midpoint
Table I
Record of Standardized Haul Factors for Oblique Haulsmade with Plankton Nets during Cruises 33-43 in 1952
Cruise and Konth
33 34 35 35 36 37 38 39 40 41 42 43Late
Jan. Feb. liar. I'ar . Apr. May June July Aufc. Sept , Oct. Nov.
2.35 -
4.39 -
- 2. 68 -
2.97 -
3.18 -
- 3.08 -
- - - 3.22 -
NQ " -
3^37 _
- 4.86 -
1.37 -
2.09 2.42 -
-3.08-- 2.58 -
2.93 -
1.71 -----1.91 2.97 -
2.89 - - - -
3.52 2.94 -
2.58 1.49 -
1.11 2.21 - - - -
2.30 - - - -
2.00 3.01 -
1.22 - 1.96 NQ 2.99 1.62 2.16 2.07- - - 3.21 -
1.98 - 2.94 3.64 - 2.49 2.47 3.003.05 NQ -
2.94 - 2.92 2.32 - 1.96 2.48 2.921.68 2.77 NQ - - 1.62 2.77 2.762.18 2.91 2.83 3.02 - 2.96 2.40 2.99
2.85 3.21 - - 2.22 2.78 2.48- 2.51 2.49 2.86
0.90 2.09 1.72 2.07 2.59 1.10 2.41 2.342.04 3.05 2.65 3.07 3.29 1.51 2.78 2.68
2.66 2.90 3.67 -
2.23 2.83 2.64 -
1.47 2.47 1.77 NQ 2.92 1.57 - 2.153.01 3.13 2.70 4.30 3.09 2.23 3.49 2.63
3.82 3.19 -
3.59 2.79 3.29 2.09 3.08 2.67
Table I (cont'd)Record of Standardized Haul Factors for .Obiioue Haulsmade with Plankton "lets during Cruises 33-43 in 1952
Cruise and . bnth
Table I (cont'd)Record of Standardized Haul Factors for Oblique Haulsmade with Plankton Nets during Cruises 33-43 in 1952
Table I (cont'd)
Record of Standardized Haul Factors for Oblique Hauls
made with Plankton Hets during Cruises 33-43 in 1952
Cruise and Month
Table I (cont'd)Record of Standardized Haul Factors for Oblique Haulsmade with Plankton Nets during Cruises 33-43 in 1952
Cruise and Month33 34 35 35 36 37 38 39 40 41 42 43
LateSta. Jan. Feb. Mar. Mar. Apr. May June July Aug. Sept. Oct. Nov .
105.32 1.13 1.40 1.59 - - - - 1.80 -
105.35 2.12 2.76 2.57 - 2.71 -
105.40 2.51 2.86 2.45 - 3.18 -
105.45 ------- 3.28 -
105.50 2.94 2.44 2.65 - 3.35 -
105.55 ------- 2.43 -
105.60 2.83 3.06 2.82 - 2.78 - - - -
105.70 2.66 2.72 1.90 _ _ _ _ 2.89 - - - -
105.80 2.42 3.05 ----- 2.40 -
105.90 --__--_ 3.01 -
107.32 - _ _ - 3.18 2.13 3.51 - 2.96 2.79 1.95 1.58107.35 - - - _ 2.95 2.16 3.21 -- 2.84 2.59 2.69 3.12107.40 - - _ _ 3.15 2.46 3.10 - 3.89 3.07 -
107.45 ----- 2.20 3.27 -----107.50 - _ - - 3,59 4.56 3.02 -----107.55 ------ 3.03 -----107.60 - 3.47 2.57 2.97 -----107.65 ------ 3.59 _____107.70 - _ _ _ 3.16 2.65 3.38 -----107.80 _ - _ _ 3.07 2.70 2.97 -----110.33 1.22 1.38 - - 2.98 2.00 1.93 2.33 2.26 3.13 2.06 2.02110.35 2.73 2.58 2.72 - 3.10 3.25 2.73 2.53 3.13 2.70 1.71 2.49110.40 2.87 2.53 2.92 - 3.32 2.80 3.25 2.49 3.46 3.38 2.20 3.14110.45 ----- 4.94 2.6I -----110.50 2.83 3.07 2.95 - 2.96 3.70 3.62 2.53 3.10 2.85 2.79 2.59110.55 ------ 3.71 _____110.60 - 2.72 2.42 - 2.89 2.95 3.24 2.93 3.61 2.93 2.99 2.91110.65 ------ 3.74 • _ - _
110.70 2.80 3.06 2.68 - 2.95 3.46 3.56 2.26 -
110.80 3.28 2.71 - - 3.16 3.07 3.10 2.53 - - - -
110.90 2.17 3.18 - - 3.46 2.72 3.35 2.20 _ - - -
113.30 - 1.45 1.33 2.44 I.64 1.61 1.98 1.68 3.14* 2.41 1.34 2.22113.35 - 2.98 2.66 3.08 3.00 3.17 2.76 2. si 2.57 - - 3.50113.40 - 3.00 2.77 2.81 3.41 3.07 3.23 3.08 3.67 3.27 3.36 2.79113.45 - - _ 2.93 - 2.53 3.57 2.92 -
113.50 - 2.96 3.06 3.19 - 3.18 3.94 2.62 -
113.55 - - - 3.35 - 3.10 3.24 2.54 -
113.60 - 2.80 2.74 2.84 2.82 3.14 3.25 2.65 - - - -113.65 - 2.72 2.92 3.28 3.23 -----113.70 - 2.74 - 2.95 3.10 3.20 2.93 2.92 - - - -
12
Table I (cont'd)
Record of Standardized Haul Factors for Oblique Hauls
made with Plankton Nets during Cruises 33-43 in 1952
Cruise and Month
Table I (cont'd)Record o I; ul factors I'or Oblinue Hauls
v-ts durinn Cruir.es 33-43 in 1952
Supplement to Table I
On several cruises, some stations were occupied two or more times.
A record of standardized haul factors for these additional hauls follows:
Cruise 36
Table II (cont'd)Record of Sardine Eggs, 1952
Table II (cont'd)Record of Sardine Eggs, 1952
Table II (cont'd)Record of Sardine Eggs, 1952
Table II (cont'd)Record of Sardine Eggs, 1952
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Table VIRecord of the Larvae of Hake (Merluccius prcductua ) , 1952
Crui3e and konth33 34 35 35 36 37 38 39 40 41 42 43
LateSta. Jan, Feb. Mar. ":.ar. Apr. May June July Aup. Sept. Oct. Nov .
40.38 ------- - _ ^ _
40.50 ------- _ - _ _
40^70 ------- ----40.80 ------- _--_40.90 ------- -_-_43.50 --_-___ NQ - - - -
47.50 ------- --__47.55 ------- ----47.60 ------- _--_50.47 ------- ----50.50------ -.,-__50.55 ------- --.-50.60 ------ NQ ___-50.70 ----53.52 ------ -----53.55 ------ ---_53.6O ------- ----53.65 ------57.51 ------ --_-57.55 ------ --__57.60 ------- -_--57.65 ------ ---_60.55 - - - - - NQ60.57 ------- --_-60.60 -
60.65 ------ NQ60.70 - - - -
60.80 _ - - _ 3 nq60.90 1760.100 ----- _
60.110 ---------63.52 - _ _ -
63.55 - - - -
63.60 - - - - - _ - - -
63.65 _ - _ -
67.50 - - _ - NQ67.55 - - -
67.60 ______ ____67.65 ------
58
Table VI (cont'd)
Record of the larvae of Hake (r'erluccius productus ) , 1952
Cruise and Month
33 34 35 35 36 37 38 39 40 41 42 43Late
Sta. Jan. Veb. ::ir. i.ar. Apr. Lay June July Aup. Se pt. Oct. Nov.
70.51 -____--70.55 _--- _____70.60 _ _ _ _
70.65 ----- ____70.70 - _ _ - 4 3
70.75 --___- _____70.80 12
70.90 ----10 ____70.100 _--__ _____73.50 -
73.55 ----- ____73.60 - - - - 5 NQ
77.50 - - _ _ _
77.55 _ _ _ _ 2
77.60 _____ ___-77.65 ----- NQ80.5180.55 - 11
80.60 8-6 3
80.65 ------ ____80.70 2386 - 3 6
80.75 ------ NQ-----80.80 134 - 2 1080.85 ----- ______80.90 NQ - 8
80.100 - 3
80.110 -----------83.43 ----- __-_-83.55 - - - - 18 3 -
83.60 - - - - 3 16 _--__83.65 ----- NQ83.70 - - - - _____83.75 ----- _-___83.80 -
83.85 ----- ______83.90---- 2 _____85.38 10 5 16 -
85.40 2 44
85.45 ------- ____85.50 -
85.55 ------- -.__59
Table VI (confAccord of the Larvne of Hake (^crlncciu:; produc tus) , 1952
Cruise and !'o:-.th
33 34 35 35 36 37 38 39 40 41 42 43Late
:ta> Jan. Feb. I-.ar. L'a r. Apr. May June _ July Au.^. Sept . Oct. Uov .
85.60
Table VI (cont'd)Record of the larvae of Hake (i.erluccius productua) , 1952
Cruise and I.'onth
33 34 35 35 36 37 38 39 40 41 42 43Late
3ta. Jan. F^b. liar. Kar. Apr. May June July Aug. Sept. Oct Nov.
Table VI (cont'd)Record of the Larvae of Hake ( I'erluc cius productus ) , 1952
Cruise and Month
33
Table VI (cont'd)
Record of the Larvae of Hake; (Merluccius productus ) , 1952
Cruise and Konth
33 34 35 35 36 37 38 39 40 U 42 43
LateSta. Jan. Feb. Kar . Mar. Apr. I 'ay June July Aur. Sept. Oct. Nov
.
115.27
Table VI (cont'd)Record of the Larvae of Hake Q-erluccius productus), 1952
Table VIIRecord of the Larvae of Pacific i'ackerel (Pneumatochorus die^o ) , 1952
Cruise and Month
33 34 35 35 36 37 38 39 40 41 42 43Late
Sta. Jan. Feb. Liar. I.ar. Apr. I lay June July Aufl. Sent. Oct. Nov ,
90.2890.30 - 25
90.3790.4590.53 - 390.6090.65 ----- _____90.7090.75 ----- ______90.80 - -
90.90 - -
90.100 ___-3- ____93.2793.3093.35 ----- ____93.4093.45 ----- ____93.50 - 10
93.55 ----- 12 - . -
93.60 - 1193.65----- _____93.70 - -
93.75 ----- ______93.80 ____ 4 ____93.90 _--- __3____97.3097.3297.35 -----4 _____97.4097.45 ----- 5 18
97.5097.55 ----- ____97.60 - -
97,65 ----- _____97.70 - 3 -
97.75 ----- ______97.80 _-__ ____97.90 ____ 10 3----100.29100.30100.35 ----- ____100.40100.45 ----- ____100.50100.55 ----- ____
65
Table VII (cont'd)'.coord of the Larvae of Pacific Mackerel ( Pncumatophorus dia/'o ) , 1952
Cruise and Month33 34 35 35 36 37 38 39 '40 41 "42 43
LateSta . Jan . Feb. I.'ar . far. Apr, Kay June July Aun ._ Sept . Oct. Nov
,
100.60100.65 _____ 4_____100.70100.75 ----- ______100. BO - 4100.90 - -
100.100 - - - - - ____103.30 -
103.35 -
103.40 -
103.45 _____ ______103.50 ____ _____103.55 ----- _____103.60 _____103.65 ----- _____103.70 ____ 6 _____103.75 ----- _____103.80 - - _ _ 22 ----- -
103.90 _____105.32 ____ ____105.35 ____ ____105.40 _-__ ____105.45 ------- ____105.50 ____ ____105.55 ------- -
105.60 ____ ____105.70 ____ ____105.80 _____ 2
107.32 -
107.35 - - - -
107.40 _ _ _ _ _ -
107. 45 ----- _____107.50 _--- _____107.55 ------ _____107.60 _--- _____107.65 ------- _____107.70 -__- _____107.80 ---_ _____110.33 — 4
110.35110.40110./.5 ----- __-__110.50110.55 --__-- _____
66
Table VII (cont'd)Record of the Larvae of Pacific Mackerel ( Pneumato ohorus dier:o ) , 1952
Cruise and ' lionth
33 34 35 35 36 37 38 39 40 41 42 43late
Sta. _ Jan, Feb. Mar. I'ar. Anr. Hay June July Aur:. Sept. Oct . Hov ,
110.60 - 9110.65 ------ _____110.70 - _ _ _
110.80 - 6 -
110.90 - - -
113.30113.35113.40 - 3
113.45 --- - ____113.50 - - _ _ _ _
113.55 --- - ____113.60 - -
113.65 --- _____113.70 - - -
115.27 _______ __115.30 -_--_-_- --115.35 _______ -_115.40 ____-__--_-115.50 ___________115.60 ___________115.70 _____-_-_--117.26 - 2
117.30117.35 - 4
117.40117.45 - -
117.50 - 3 -
117.55 _-- 4 54 ____J 17.60 - -
117.65 _-- _____117.70 - -
120.25 5
120.30 2 13 2
I 1.35 12 21
120.37 _------ ____120.40 -__ _____
i.45 6 29 2
120.50 6
120.55 --- 3 ____120.60120.65 __- _____120.70120.80120.90
67
Table VII (cont'd)
ilecord of the Larvae of Pacific i ackerel ( Pneuraatophoru s Jiero), 1952
Cruise and Korvbh
ble VIIIRecord of the Larvae of P.ockfish (Sebastodes spp.), 1952
Cruise and 1-onth
33 34 35 35 36 37 38 39 ^u U 42 43Late
Sta. Jan. Fe b. !!ar. l<ar. Apr. . iay_ June July Aup. Sept. Oct. Nov .
/.0.38 --_-___ ____40.50 -
40.60 -
40.70 -
40.80 -
40.90 -
43.42 -
43.50 -
47.50 -
47.55 -
47.60 -
50.47 -
50.50 -
50.55 -
50.60 -
50.70 -
53.52 -
53.55 -
53.60 -
53.65 -
57.51 -
57.55 -
57.60 -
57.65 -
60.55 4 102 NQ 3 28 10
60.57 -
60.60 18 - 212 73 6
60.65 -
60.70 24 6 58 25 6
60.80 -
60.90 -
60.100 -
60.110 -
63.52 2 3 11 2 7
63.55 - - - - 78 12 19 22 7 9 11 5
63.60 -
63.6567.50 13 5 NQ 13
67.55 24 32 77 31 3467.60 -
67.65 - 11 20 12
69
-
Table VIII (cont'd)ecord of the Larvae of i'lockfish (Seba.stodes spp.), 1932
Table VIII (cont'd)Record of the larvae of Rockfish (Sebastodes spp. ), 1952
Table VIII (cont'd)Record of the Larvae of Kockfish (Sebastodes snp.), 1952
Cruise and Lonth33 34 35 35 36 37 38 39 40 41 42 43
LateSta. Jan. Feb. liar. I'.ar. Apr . Lay _June July _ Aug. Sept. Oct. Nov .
97.30 17 46 19 - - 50 22 8 3-1197.32 36 18 8 - 37 3 7 2 12
97.35 26 3797.40 12 26 - 6 69 35 9 29 8 3
97.45 ----- 236 79 -97.50 3 29 - 119 6 74 6 3
97.55 ----- 4 202 8 - - - -
97.60 74-43 165 5
97.65 ----- 3897.70 33-6 - _ _ _
97.75 __-__ ______97.80 -__-3 -___97.90 _-_-3 -_-_100.29 5 - 30 255 25 3 10 16 11100.30 - 212 82 - 177 19 4 34 13
100.35 ------ io 3----100.40 49 24 25 36 2 2
100.45 19 35 6100.50 3 - 3 30 35 3
100.55 -----52 60 7--=.--100.60 - 14 18 26100.65 -----24 15-----100.70 - 6
100.75 ----- _-___-100.80100.90100.100 - - - -
103.30 277 16 1 4 4103.35 - - - - 112 3 6 - 3 9
3
Table VIII (cont'd)Record of the Larvae of Itockfish (Sebastodes spp.), 1952
Cruise and l-.onth
48
t'd)
Record iides spp,), 1952
Jan. Feb. . ine__July :\a<-_. Sept. Oct,
115.27 _______115.30 _-- ___._115.35 -------115.40 ----------115.50 - _____-_-115.60 - - - - - - - -.-115.70 - - -
117.26117.30117,35117.40117.45117.50117.55117.60117.65117.70120.25120.30120.35120.37120.40120.45 3
120.50120.55120.60120.65
.70
120.80120.90123.37123.40 2
123.45123.50123.55123.60127.34127.40127.45127.50127.55127.60
74
22
Table VIII (cont'd)Record of the Larvae of ttockfish (Sebastodes spp.)» 1952
Cruise and rlonth
33 34 35 35 36 17 38 39 40 /,i 42 43Late
Sta. Jan. Feb . Mar. Har. _ Apr . _ . iay__ June July _Aurr . Sept. Oct. Nov.
130.30 3 2 35 3 26
130.35 90 8 3 6
130.40 161 3 3 7 9
130.45 - -
130.50 9 15
130.55 --- _____130.60 3
130.70 ___________13o. 80 ___________133.25 25 14
133.30 9 63 23
133.35 _-- 37 ____133.40 3 3 -
133.45 - - - -
133.50 - NC. 3
133.60 -- _______137.23 2
137.30 8 44 1 15
137.35 ----5 ____137.40 26 2 - - - -
137.45 - - - 23 -
137.50 - 15
137.60 -- _______140.30 7 ------ --140.35 - __________340.40 - __________140.50 - __________143.26 - _______ __143.30 - __________143.35 - __--___--_147.20 - _______ __147.25 - ___._-----147.30 - __________150.19 - -_-__-- __150.25 - __________150.30 - __________150.40 - __________Totals 1523 2485 3155 662 4511 2672 3155 1843 419 292 547 433
75
BIBLIOGRAPHY
Papers containing information about plankton hauls, plankton volumes,and standardized numbers of fish eggs and larvae obtained on survey cruisesof the California Cooperative Oceanic Fisheries Investigations since theirinitiation in March 1949 are the following:
AHLSTROM, ELBERT H.
1952. Pilchard eggs and larvae and other fish larvae, Pacific coast, 1950.U. S. Dept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.:Fisheries No. 80, 58 pp.
1953* Pilchard eggs and larvae and other fish larvae, Pacific coast, 1951.U. S. Dept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.:Fisheries No, 102, 55 pp.
STAFF, SOUTH PACIFIC FISHERY INVESTIGATIONS1952. Zooplankton volumes off the Pacific coast, 1951. U. S. Dept.
Interior, Fish and Wildlife Service, Spec. Sci. Rept.: FisheriesNo. 73, 37 pp.
1953. Zooplankton volumes off the Pacific coast, 1952. U. S. Dept.Interior, Fish and Wildlife Service, Spec. Sci. Rept.: FisheriesNo. 100, 41 pp.
In Press. Zooplankton volumes off the Pacific coast, 1949 and 1950. U. S.
Dept. Interior, Fish and Wildlife Service, Spec. Sci. Rept.:Fisheries.
76
