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Yellow perch (Perca flavescens) in Lake Michigan have experienced,sustained recruitment failure since 1990 as a result of increased mortality during the pelagic larval phase. Increased mortality of larval yellow perch has been tied indirectly to increased alewife (Alosa pseudoharengus) predation, but effects of predation on larval survival vari- ability must be better understood. We compared,the relative importance,of predation by alewife and two other fish predators to larval survival in laboratory experiments,and developed,an individual-based predation model,(IBM) to ex- amine,patterns in size-dependent predation vulnerability. Simulations exposing,larval perch to predation by all predators suggest that larval mortality resulting from alewife predation is more,size-dependent than mortality resulting from the other two predators, and the range of sizes vulnerable to alewife is smaller. Alewife predation may not be an important mortality source for larval yellow perch in Lake Michigan at present because of the narrow,range of vulnerable sizes and low densities of larval perch in the open lake. Predation is more likely to be important in smaller, more productive systems where,other predators are abundant. Modeling results also indicate IBM analysis of date of hatch distributions of surviving larvae is a valuable tool for identifying factors most important to larval survival. Résumé : Les perchaudes,(Perca flavescens) du lac Michigan subissent un échec soutenu de leur recrutement,depuis

canadian journal of fisheries and aquatic sciences

Elucidating patterns of size-dependent predation on larval yellow perch (<i>Perca flavescens</i>) in Lake Michigan: an experimental and modeling approach

Elucidating patterns of size-dependent predation on larval yellow perch (Perca flavescens) in Lake Michigan: an experimental and modeling approach