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• W2141751208 abstract "ABSTRACf Direct field measurements of the feeding of five schools of northern anchovy over four sets of conditions indicate consistent size-selective feeding on the dominant zooplankton taxa. At low-to­ moderate prey concentrations (10-40 mg carbon per cubic meter), the schools consumed 35-50% of the total zooplankton biomass and >90% of the largest zooplankters present. The schools' feeding was a positive function of prey size primarily. The density of particular prey items did not significantly affect feeding selectivity. The northern anchovy fed preferentially upon a particular species in only one instance. No significant difference was found in the selectivity of two northern anchovy schools composed primarily of late O-group and II-group fish, respectively, that were feeding under similar feeding conditions. At prey concentrations of 10-40 mg carbon per cubic meter, the degree of selectivity was inversely related to the size of the largest prey available. The prey size at which consumption is predicted to be 100% was proportional to the size of the largest prey. Field studies have demonstrated that planktiv­ orous fish can control zooplankton community structure in oligotrophic lakes and stocked fish Ponds by selectively feeding upon the larger, more visible prey organisms (see Gliwicz and Prejs 1977 and Dodson 1979 for a critical discus­ sion of this work). However, while highly produc­ tive regions in the world's oceans typically sup­ Port large populations ofschooling, planktivorous fish, the impact of these fish populations upon marine zooplankton communities is not known. Taking as an example the estimated consump­ tion of zooplankton by the northern anchovy, Engraulis mordax, in the Southern California Bight, it becomes clear that marine fish popula­ tions may have considerable impact on the zoo­ plankton in the system. The prey consumption of the northern anchovy may be calculated based Upon data for the biomass of the population, its a?nual reproduction and growth, and assump­ tIons concerning its metabolic efficiency. The results of this calculation can. then be compared with estimates of zooplankton production in the region. In the Southern California Bight, the spawning biomass of the northern anchovy in the mid­ 1960's to early 1970's averaged between 1.32 and 2.35 x 10 6" @default.
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• W2141751208 title "FEEDING SELECTIVITY OF SCHOOLS OF NORTHERN ANCHOVY, ENGRAULIS MORDAX, IN THE SOUTHERN CALIFORNIA BIGHT" @default.
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