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Reproduction and spawning of the northern anchovy engraulis mordax in san pedro bay california usa



Reproduction and spawning of the northern anchovy engraulis mordax in san pedro bay california usa



California Fish and Game 64(3): 175-184



The gonosomatic index (GSI) was computed for samples of adult northern anchovy collected from the Los Angeles-Long Beach Harbor [California, USA] live-bait fishery during 1973 and 1974. GSI values were highest in Feb. and March of both years and declined to the lowest values in Sept. The abundance of anchovy eggs and larvae in plankton samples taken from San Pedro Bay during the same period was also highest in Feb. and March and lowest during Aug. and Sept. Field and laboratory data suggest that within an environmental temperature range of 13-18.degree. C, northern anchovy have the potential to breed all year, but are constrained to a seasonal reproductive cycle by dietary requirements that exceed available production of zooplankton.

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