Premium
Evaluation of Procedures for Back‐Calculation of Lengths of Largemouth Bass Aged by Otoliths
Author(s) -
Schramm Harold L.,
Malvestuto Stephen P.,
Hubert Wayne A.
Publication year - 1992
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8675(1992)012<0604:eopfbc>2.3.co;2
Subject(s) - bass (fish) , micropterus , fishery , fish <actinopterygii> , biology , mathematics
Back‐calculation techniques for estimating fish lengths at previous ages have been evaluated for measurements from scales; however, there has been no evaluation of mathematical methods for back‐calculating lengths from otoliths. Samples of Florida largemouth bass Micropterus salmoides floridanus from five lakes were aged by otoliths and used to compare fish lengths at previous ages estimated by three back‐calculation techniques–direct proportion, intercept‐corrected direct proportion, and regression. The direct proportion method provided the most reliable estimates of fish lengths at previous ages when otoliths were used. Lengths at previous ages back‐calculated from the most recently formed annuli were similar to lengths back‐calculated from earlier annuli of older fish.