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Variability in FishStock Abundance
Examples of FishStock Variability from the Historical
Introduction to FisheryRelated PopulationDynamics
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abundance addition adult anchovy appears approach associated average behavior biomass causes changes cohort complex concern consider considerable constant curve Cushing decline decrease density density-dependent dependence difficult discussion distribution dynamics effects egg production environment environmental estimates evidence example exist fact factors fecundity feeding Figure fish fishery function growth haddock Hence important increase individuals interaction interest involve larvae length magnitude maturity mean mechanisms mortality mortality rates nature North Sea notion nutrition observed occur organisms particles particular percent period physical population population-dynamics possible predation presented prey probability problem question recruitment recruitment-stock reflect relation relationship relatively represent reproductive require result sampling sardine scales seems shows signals spawning species stage suggests temperature tend theory tion understanding values variability variation various volume weight