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Influences of female body condition on recruitment success of walleye ( Sander vitreus ) in Wisconsin lakes

2019; Canadian Science Publishing; Volume: 76; Issue: 11 Linguagem: Inglês

10.1139/cjfas-2018-0364

1205-7533

Zachary S. Feiner, Stephanie L. Shaw, Greg G. Sass,

Marine and fisheries research

Stock reproductive potential informs population dynamics and response to harvest. Indices of body condition, like relative weight (W r ), may indicate individual energetic state and provide a mechanistic link between spawning stock traits and recruitment. We tested for relationships among W r of three female size classes (381–456, 457–557, and ≥558 mm total length), reproductive traits, and age-0 recruitment using data from 92 walleye (Sander vitreus) populations in the Ceded Territory of Wisconsin during 1989–2015 and a lake-specific time series from Escanaba Lake, Wisconsin, during 1958–2014. In Escanaba Lake, W r was positively related to maturation in small females and was positively related to fecundity and gonadosomatic index in intermediate fish. Among and within populations, W r demonstrated compensatory density dependence and positive relationships with growing degree-days. Recruitment was positively related to large female W r variation across lakes and negatively related to small female W r variation in Escanaba Lake. Improving the condition of large female walleye may promote recruitment, and W r may serve as an accessible metric of reproductive potential in walleye stock–recruit analyses.