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Relationships among condition indices, feeding and growth of walleye in Lake Erie
Author(s) -
HARTMAN K. J.,
MARGRAF F. J.
Publication year - 2006
Publication title -
fisheries management and ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 55
eISSN - 1365-2400
pISSN - 0969-997X
DOI - 10.1111/j.1365-2400.2006.00486.x
Subject(s) - fishery , biology , food consumption , index (typography) , fish <actinopterygii> , predation , consumption (sociology) , ecology , agricultural economics , world wide web , computer science , economics , social science , sociology
Condition indices are often used as surrogates of fish health, growth, and feeding and to compare ecological well‐being among fish populations. In an effort to identify easily measured indices, growth and food consumption were compared with gonadal‐somatic index, liver‐somatic index (LSI), fat‐somatic index and relative weight ( W r ) for ages 1–3 walleye, Sander vitreus (Mitchill), in Lake Erie from 1986 to 1988. The LSI and W r were significantly correlated with growth rate or food consumption, but correlations were too small to be considered biologically meaningful. Furthermore, no consistent relationships between condition indices and growth or consumption were found among combinations of fish age and season. None of the indices are considered reliable surrogates for more laborious estimates of growth and food consumption for Lake Erie walleye. Significant relationships between W r and relative abundance of key prey species warrant further investigation.