Salmonid size at lake or river entry can influence survival to adult stages, which affects both fisheries management actions and policy tools such as population dynamics models. To examine the importance of fish size in relation to survival, this investigation searched and reviewed published literature and evaluated and used back-calculations of size at lake or river entry, identified from scale features. Predation, starvation, competition, and disease or parasites are both direct and indirect mechanisms of selection against smaller fish, in probable decreasing order of importance. Size-related survival appears widespread but variably important; four general patterns of survival versus size occur; no relation to size, inverse dependence on size, increasing monotonically with size (sometimes asymptoting), and initially increasing then decresing at larger sizes. Back-calculation of size at lake or river entry has limited applicability in estimating size-related survival without data describing juvenile migratio
Burrows, Jeff A.. 1993. Size-related Survival of Resident Salmonids from Time of Lake or River Entry: Evidence from the Literature and Scale Evaluations. Ministry of Environment. Fisheries Management Report. FMR100
Topic: Fish and Fish Habitats
Keywords: salmonids, size, survival
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