Is density-dependent growth in young-of-the-year fishes a question of critical weight?

Is density-dependent growth in young-of-the-year fishes a question of critical weight? We develop a conceptual argument thatdensity-dependent growth via reductions in preyresources are most likely to occur in the late-larvalor juvenile stage in both marine and freshwaterfishes. We use results from a suite ofindividual-based models and literature examples of avariety of marine, estuarine and freshwater species toprovide evidence of the effects of age-0 fish on theirprey. We conclude that larval-stage survival relatedto food-limited growth contributes significantly torecruitment variability. However, density-dependentregulation of cohort biomass via feedbacks derivedfrom reductions in prey resources is most likely tooccur at a ``critical-weight'' during the late-larval orjuvenile stage. This occurs when fish densitiesremain relatively high, and population consumption ishighest relative to prey density and replenishmentrate. We compare our critical weight concept toHoude's (1997) critical size hypothesis. Reviews in Fish Biology and Fisheries Springer Journals

Is density-dependent growth in young-of-the-year fishes a question of critical weight?

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Kluwer Academic Publishers
Copyright © 2000 by Kluwer Academic Publishers
Life Sciences; Freshwater & Marine Ecology; Zoology
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