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First-Year Growth, Recruitment, and Maturity of Walleyes in Western Lake Erie

 

作者: CharlesP. Madenjian,   JeffreyT. Tyson,   RogerL. Knight,   MarkW. Kershner,   MichaelJ. Hansen,  

 

期刊: Transactions of the American Fisheries Society  (Taylor Available online 1996)
卷期: Volume 125, issue 6  

页码: 821-830

 

ISSN:0002-8487

 

年代: 1996

 

DOI:10.1577/1548-8659(1996)125<0821:FYGRAM>2.3.CO;2

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

In some lakes, first-year growth of walleyesStizostedion vitreumhas been identified as an important factor governing recruitment of juveniles to the adult population. We developed a regression model for walleye recruitment in western Lake Erie by considering factors such as first-year growth, size of the spawning stock, the rate at which the lake warmed during the spring, and abundance of gizzard shadDorosoma cepedianum. Gizzard shad abundance during the fall prior to spring walleye spawning explained over 40% of the variation in walleye recruitment. Gizzard shad are relatively high in lipids and are preferred prey for walleyes in Lake Erie. Therefore, the high degree of correlation between shad abundance and subsequent walleye recruitment supported the contention that mature females needed adequate lipid reserves during the winter to spawn the following spring. According to the regression analysis, spring warming rate and size of the parental stock also influenced walleye recruitment. Our regression model explained 92% of the variation in recruitment of age-2 fish into the Lake Erie walleye population from 1981 to 1993. The regression model is potentially valuable as a management tool because it could be used to forecast walleye recruitment to the fishery 2 years in advance. First-year growth was poorly correlated with recruitment, which may reflect the unusually low incidence of walleye cannibalism in western Lake Erie. In contrast, first-year growth was strongly linked to age at maturity.

 

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