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Variability in FishStock Abundance
Examples of FishStock Variability from the Historical
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adult asymptotic average behavior biological biomass causes changes cohort collapse complex consider copepod curve Cushing decline decrease density density-dependent dependence dinoflagellate distribution ecosystem egg production eggs and larvae environment environmental example factors fecundity feeding Figure fish larvae fish populations fish stocks fishery fishing mortality flatfish food signal function gadoid Georges Bank growth haddock Hence high-fecundity important increase ingested interaction juvenile large numbers larval mortality level of abundance life-history stages low-fecundity magnitude maturity mechanisms ment module mortality rates nauplii North Sea northern anchovy number of eggs number of fish number of recruits nutrition observed organisms particles particular Paulik percent physical phytoplankton pink salmon plaice plankton Poisson distribution population dynamics population-dynamics process predation prey problem recruitment-stock relation recruitment-stock theory relationship relatively reproductive Ricker sampling sardine somatic spawning species suggests survival temperature tion trophic variability variation weight yield-per-recruit young fish zooplankton