Validation of otolith ages for walleye ( Sander vitreus ) in the Winnebago System
Fisheries Research(2015)
摘要
•Compared dorsal spine and otolith derived age estimates from 299 known age walleye (ages 0–10, 16, 18) and more than 2000 additional walleye.•Correlated catch curve residuals from structure and sex-specific catch curves to standard walleye recruitment indices.•Otoliths yielded accurate age estimates for known age walleye, while dorsal spines underestimated the age of walleye age-6 and older.•Otoliths yielded older age estimates than dorsal spines for both male and female walleye.•Catch curve residuals derived from otolith age estimates correlated well with recruitment indices while residuals derived from dorsal spine age estimates did not.
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关键词
Age estimation,Age validation,Otolith,Walleye,Recruitment index
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