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The variability of the catch from gill nets set for pike Esox lucius L.
Author(s) -
BAGENAL T. B.
Publication year - 1972
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1972.tb01582.x
Subject(s) - esox , pike , fishery , variance (accounting) , reliability (semiconductor) , fish <actinopterygii> , statistics , ecology , biology , mathematics , physics , accounting , business , power (physics) , quantum mechanics
SUMMARY The variability of the catch of pike Esox lucius L. from gill nets in Windermere over the period 1961–71 has been analysed. Altogether 2952 catches have been treated by analysis of variance after an appropriate transformation. A representative value of the residual between catch variance has been used to estimate the reliability of the means of catches based on different numbers of net settings. It is shown that many settings of gill nets are required to get a reliable mean catch.