CalCOFI Reports, Vol. 27, 1986 - California Cooperative Oceanic ...

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LAVENRERG ET AL.: SOUTHERN CALIFORNIA NEARSHORE ICHTHYOPLANKTONCalCOFI Rep., Vol. XXVII, 19861oooc1000R............................................................... .....OD0 100cX0)(13L ' 10(13c0z01978 1979 1980 1982 1983 1984Figure 8. Estimated abundance of white croaker (Genyonernus lineatus) larvae, 1978-84. See legend of Figure 3.was concentrated in this area, in the lee of the PalosVerdes Peninsula. Although northern anchovy is awide-ranging, common, planktivorous fish thatspawns extensively in the bight, its effort in the southoff San Onofre is poor. Barnett et al. (1984) remarkedon the low abundances of E. mordax eggs off SanOnofre, concluding that the large number of excesslarvae must come from outside the sampling area. Our.................................................................................................OD0cXQ)rn>L(13c0z1978 1979 1980Figure 9. Estimated abundance of queenfish (Seriphuspolitus) larvae, 1978-84. See legend of Figure 3.1982 1983 198462
LAVENBERG ET AL.: SOUTHERN CALIFORNIA NEARSHORE ICHTHYOPLANKTONCalCOFl Rep., Vol. XXVII, 1986f IOooII) 1000cXQ,PLQc10a1982 1983 1984Figure 10. Estimated abundance of California halibut (Paralichfhys californicus)larvae, 1982-84. At the time of this writing, earlier counts (1978-80) ofthis species were contaminated with those of fantail sole, Xystreurys /iolepis.The hatched area represents abundance between the 36- and 75-mcontours.data of northern anchovy egg distributions supporttheir conclusion.McCall (1983) predicted that as the spawningbiomass of a planktivorous fish stock shrinks, thespawning should tend to contract into a few favorablenearshore locations. Pacific sardine, which once wasan important commercial fish in offshore waters, issuch a depleted stock, its spawning biomass havingreached particularly reduced values between 1974 and1978 (Wolf 1985). Sardine larvae were first encounteredin nearshore waters in the central portion ofthe bight at Seal Beach, and as the intensity of theirspawning increased they spread into surrounding coastalwaters. Our data suggest that MacCall's model for arecovering fish stock may apply to this species.Ahlstrom (1967) reported spring and fall spawningof Pacific sardine, the spawning during the second halfof the year being confined to a southern subpopulationin waters adjacent to central Baja California. Becausethe spawning effort of the recovering sardine stock hasprimarily been in late summer and fall, the springtimeegg production noted by Wolf and Smith (1985)probably underestimates the adult stock off southernCalifornia. It is not known whether the large increasesof sardine eggs and larvae in the bight in the fall of1982 were due to a shift in seasonality of a recoveringnorthern stock, or whether a fall-spawning southernstock moved northward, or both.There were apparent manifestations of the CaliforniaEl Niiio in these ichthyoplankton data. In the fall of1983 round herring suddenly appeared in the bight.This fish had not previously been identified from ourFigure 11. Density of California halibut yolk-sac larvae, 1982-84. See legend ofFigure 4.samples, and normally occurs in waters well to thesouth of the bight. Pacific sardine spawning intensified,and was sustained over a long season (June-October). The number of larval taxa increased in 1983.There was also a reduced level of spawning ofCalifornia halibut, which was contracted into the areaoff Seal Beach, as mentioned above. The 1982recovery of sardine corresponded with the onset of ElNiiio conditions in the tropics, but preceded by a yearthe full development of anomalous hydrographic conditionsin the Southern California Bight (McGowan1984; Petersen et al. 1986). One of us (G.E.M.) is currentlyinvestigating the relationship between spawningintensity and aspects of the ocean environment.ACKNOWLEDGMENTSMany people gave freely of their time and assistanceover the 5-year span of this project, particularly thecrews and support staffs of the Sea Watch, Universityof Southern California, and Vantuna, Vantuna ResearchGroup, Occidental College, especially MickeySinger and Gary Jordan.We owe a great debt to our dedicated fraternity ofsorters and identifiers who had the difficult tasks ofsorting and identifying the thousands of ichthyoplankters.We thank particularly Steven Caddell, DennisChandler, Donna Eto, Richard Feeney, DenaGadomski, Sue Goodman, Lauma Jurkevics, Debra63
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REPORTSVOLUMECICTCIBERXXVll1986
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EDITOR Julie OlfeSPANISH EDITOR Pat
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COMMITTEE REPORTCalCOFI Rep., Vol.
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FISHERIES REVIEW: 1985CalCOFl Rep.,
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FISHERIES REVIEW: 1985CalCOFI Rep.,
Page 14 and 15: FISHERIES REVIEW: 1985CalCOFl Rep.,
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Page 28 and 29: WOLF AND SMITH: MAGNITUDE OF SARDIN
Page 34 and 35: PUBLICATIONSCalCOFI Rep., Vol. XXVI
Page 37 and 38: Part I1SYMPOSIUM OF THE CALCOFI CON
Page 39 and 40: PETERSEN ET AL.: NEARSHORE HYDROGRA
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Page 109: Part 111SCIENTIFIC CONTRIBUTIONS
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BAILEY ET AL.: FORECASTING HAKE REC
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ESPINO AND WOSNITZA-MENDO: PERUVIAN
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MacGREGOR: SEBASTES ABUNDANCECalCOF
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MacGREGOR: SEEASTES ABUNDANCECalCOF
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-~ ~MacCREGOR: SEBASTES ABUNDANCECa
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LLUCH-BELDA ET AL.: GULF OF CALIFOR
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DuracionQUINONEZ-VELAZQUEZ Y GOMEZ-
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FIEDLER: OFFSHORE ENTRAINMENT OF AN
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SCHMITT: SELECTIVITY AND FEEDING OF
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SCHMIlT: SELECTIVITY AND FEEDING OF
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MOSER ET AL.: EARLY STAGES OF OCEAN
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~MOSER ET AL.: EARLY STAGES OF OCEA
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ARCOS AND FLEMINGER: CALANOID COPEP
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TRUJILLO-ORTIZ: ACARTlA CALIFORNIEN
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TRUJILLO-ORTIZ: ACARTIA CALlFORNlEN
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TRUJILLO-ORTLZ: ACARTIA CALIFORNIEN
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CHEN: VERTICAL DISTRIBUTION OF PELA
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CHEN: VERTlCAL DISTRIBUTlON OF PELA
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BRINTON ET AL.: GULF OF CALIFORNIA
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METHOT: FRAME TRAWLCalCOFI Rep., Vo
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-130' 125. 120' 11.5. 110.I I I I I
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