CalCOFI Reports, Vol. 11, 1967 - California Cooperative Oceanic ...

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134 CALIFORNIA COOPERATIVE OCEANIC FISHERIES INVESTIGATIONSfewer hauls (644). Some of the irregularities in thiscurve, compared with the other three, may be due tofewer data.At first glance at the two curves for sardine larvae,one gets the impression that survival may have beensomewhat better in the eo-occurring hauls. On closerinspection however, it is seen that larvae larger than6.75 mm followed no consistent trend, except as notedbelow. The greatest difference in relative abundancewas between the smaller larvae (3.0-5.75 mm long)and all larger larvae. This difference could be interpretedas poorer initial survival of sardine larvae insituations where they occur alone. An equally logicalexplanation for the difference, however, is based onthe increasing frequency of co-occurrences of sardineand anchovy larvae with increase in size. It wasnoted earlier that the frequency of eo-occurrence ofsardine and anchovy eggs was markedly lower thanfor larvae. A natural corollary is that newly hatchedlarvae of the two species would co-occur less frequentlythan the larger larvae. The effect on abundancecurves would be to increase the numbers oflarger larvae in hauls in which the species eo-occurredthan in hauls in which they occurred alone. Furthermore,the two curves for sardine larvae do convergeif all larger-sized larvae (17.25-25.25 mm) are takeninto account. As many larger larvae were taken inhauls in which sardines occurred alone as in haulsin which both species occurred-0.73 larvae per haulon the average.Thus, the basic question has been answered j bettersurvival was not indicated by the hauls in which bothspecies were caught even though average numbers oflarvae per haul were larger.Although the analysis has been confined largely tothe 1950’~~ the report can be brought up to date.Tables 3 and 4 include the number of occurrencesand co-occurrences of sardine and anchovy larvaeduring the first 3 years of quarterly cruises, 1961-63.Anchovy larvae occurred in 43 percent of the haulsin 1961, 49 percent in 1962, and 54 percent in 1963.Sardine larvae occurred in 5 percent of the haulsin 1961, 6 percent in 1962, and 9.5 percent in 1963.(Data for 1963 are not closely comparable to those forother years because a number of closely spaced inshorestations were added.) Anchovy larvae occurredin nearly 90 percent of the hauls containing sardinelarvae. In contrast, sardine larvae occurred in only13 percent of the hauls containing anchovy larvae.Co-occurrences of anchovy larvae with sardine larvaewere even higher than in the late 1950’~~ and even ahigher percentage of the collections of anchovy larvaecontained no sardine larvae. Anchovy larvae now seemto be completely dominant.100.0-,, I I I I I I I I I I I I I100I I I I I I I I I I I I I I2 10.0-IW2culgKWaaWmI ‘2 1.0-w2W20.1I1 1-ANCHOVY WITH SARDINE LARVAEANCHOVY LARVAE ALONEl f 1 1 1 1 1 1 l J 1 l IJ3aIy IO-tv)2KWaKwm52WCllaKwzI 1 1 1 1 1 1 1 1 1 1 1 1 I3.00 4.75 675 8.75 1075 12.75 14.75 IZ2!LENGTH IN MM.FIGURE 12. Comparisons of average number of sardine larvae perpositive haul as related to length (mm) for 1) hauls containing bothsardine and anchovy larvae and 2) hauls with sardine larvae alone.Data for 1951-60 combined.
REPORTS VOLUME XI, 1 JULY 1963 TO 30 JUNE 1966 135REFERENCESAhlstrom, Elbert H. 1948. A record of the pilchard eggs andlarvae collected during surveys made in 1939 to 1941. U.S.Fish and Wild. Serv., Spec. Sci. Rept., (54):1-76.-1953. Pilchard eggs and larvae and other fish larvae,Pacific coast-1951. U.S. Fish and Wild. Serv., Spec. Sci.Rept.: Pish. (102) :1-55.-1954. Pacific sardine (pilchard) eggs and larvae andother fish larvae, Pacific coast-1952. U.S. Fish and Wild.Serv., Spec. Sci. Rept.: Fish. (123) :1-76.-1958. Sardine eggs and larvae and other fish larvae,Pacific coast, 1956. U.S. Fish and Wild. Serv., Spec. Sci.Rept.: Fish. (251) :1-84.-1959. Sardine eggs and larvae and other fish larvae,Pacific coast, 1957. U.B. Fish and Wild. Serv., Spec. Sci.Rept.: Fish. (328) :1-99.-1966a. Distribution and abundance of sardine and anchovylarvae in the California Current Region off California andBaja California, 1951-64: A summary. U.S. Fish and Wild.Serv., Spec. Sci. Rept.: Fish. (534) :1-71.-196613. Size composition of larvae of the Pacific sardineand northern anchovy obtained on CalCOFI survey cruises,1958 and 1959. A Preliminary Data Eept., 57 p. U.S. Bur.Comm. Fish., La JoZZa (available on request).-1967. Size composition of larvae of the Pacific sardine andnorthern anchovy obtained on CalCOFI survey cruises, 1960-1964. A Preliminary Data Rept., 98 p. U.S. Bur. Comm.Fish., La JoZla (available on request).Ahlstrom, Elbert H., and D. Kramer. 1955. Pacific sardine(pilchard) eggs and larvae and other fish larvae, Pacificcoast, 1953. U.S. Fish and Wild. Serv., Spec. Sci. Rept.:Fish. (155):1-74.- 1956. Sardine eggs and larvae and other fish larvae, Pacificcoast, 1954. U.S. Fish a d Wild. Serv., Spec. Sci. Rept.: Fish.(186) :1-79.-1957. Sardine eggs and larvae and other fish larvae, Pacificcoast, 1955. U.S. Fish and Wild. Serv., Spec. Sci. Rep?.:Fish. (224) :1-90.Marr, John C., and E. H. Ahlstrom. 1945. Observations on thehorizontal distribution and the numbers of eggs and larvaeof the northern anchovy (Engraulis mordax) off Californiain 1940 and 1941. U.S. Fish and Wild. Serv., Spec. Sci.Rept. (54) :1-76.
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STATE OF CALIFORNIAMARINE RESEARCH
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STATE OF CALIFORNIADEPARTMENT OF FI
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RONALD REAGAXGovcriwr of the Slate
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PART 1REVIEW OF ACTIVITIESJuly 1,19
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REPORTS YOLUAIE SI, 1 JULY 1963 TO
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REPORTS VOLUNE XI, 1 JULY 1963 TO 3
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REPORTS YOLUME SI, 1 JULY 1963 TO 3
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REPORTS VOLUME XI, 1 JULY 1963 TO 3
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REPORTS vor,uiwIi; SI, 1 JULY 1063
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REPORTS TOT2T71\IF: SI, 1 JUJIT 196
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IiEPOHTS TOLUME XI, 1 JULY 1963 TO
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REVIEW OF THE PELAGIC WET FISHERIES
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KEI'OiiTH TOLUJIE SI, 1 JULY 1963 T
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PART IISYMPOSIUM ON ANCHOVIES, GENU
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OCEANIC ENVIRONMENTS OF THE GENUS E
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KEI'OKTS VOLIXI.: SI, 1 JULY 1963 T
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~~~REPORTS VOLUME XI, 1 JULY 1963 T
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REPORTS VOLUME SI, 1 JULY 1963 TO 3
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130'E 132' 134' 136' 138' 140' 142-
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REPORTS VOLUSIE SI, 1 JULY 1963 TO
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KI3I’ORTH VOLUJIE XI, 1 JULY 1963
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REPORTS VOLUME SI, 1 JULY 1963 TO 3
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REPORTS VOLUIIE SI. 1 JULY 1963 TO
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REPORTS T’OLUME XI, 1 JULY 1963 T
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INFLUENCE OF SOME ENVIRONMENTAL FAC
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REPORTS Y‘OLUJIE XI, 1 JULY 1963
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~table shows the values calculated
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ateREPORTS T-OLTJIT", SI, 1 JULl 19
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REPORTS POLGNE SI, 1 JU LY 1963 TO
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REPORTS VOLUXE XI, 1 JULY 1963 TO 3
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Page 85 and 86: _________--_____REPORTS VOLUJIE SI,
Page 87 and 88: REPORTS TOLTIJIE SI, 1 JULY 1963 TO
Page 89 and 90: -20/5-0 10-f 5-w 25-0 20-= 15-: 10-
Page 91 and 92: REPORTS VOLUNE SI. 1 JULY 19G3 TO 3
Page 93 and 94: REPORTS VOLUME XI, 1 JULY 1963 TO 3
Page 97 and 98: REPORTS VOLURlE SI, 1 JULY 1963 TO
Page 107 and 108: THE PREDATION OF GUANO BIRDS ON THE
Page 109 and 110: iod and after 8 AM during the rest
Page 115 and 116: FISH E RYThe California anchovy fis
Page 117 and 118: ~~ ::REPORTS VOLUME XI, 1 JULY 1963
Page 119: CO-OCCURRENCES OF SARDINE AND ANCHO
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Page 124 and 125: CALIFORNIA COOPERATIVE OCEANlC FISH
Page 128 and 129: 126CALIFORNIB COOPERATIVE OCEANIC F
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Page 134 and 135: 132 CALIF0RhTTIA COOPERATIVE OCEANI
Page 138 and 139: THE ACCUMULATION OF FISH DEBRIS IN
Page 143 and 144: PART IllSCIENTIFIC CONTRIBUTIONS
Page 147 and 148: REPORTS VOLUME SI, 1 JULY 1963 TO 3
Page 151 and 152: REPORTS VOLU&IE XI, 1 JULY 1963 TO
Page 157 and 158: SUMMARY OF THERMAL CONDITIONS AND P
Page 159 and 160: SEASONAL VARIATION OF TEMPERATURE A
Page 163 and 164: including the semiannual harmonic?
Page 167 and 168: REPORTS VOiLUME XI, 1 JULY 1983 TO
Page 169: REPORTS VOLUME XI, 1 JULY 1963 TO 3
Page 172 and 173: 170 CALIFORNIA COOPERATIVE OCWIC FI
Page 174 and 175: 172 CALIFORNIA COOPERATIVE OCBANIC
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184CALIFORNIA COOPERATIVE OCEANIC F
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186 CALIFORNIA COOPERATIVE OCEANIC
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CONTENTSI. Review of Activities Pag
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