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Validity of fin‐ray ageing for brown trout
Author(s) -
Shirvell C. S.
Publication year - 1981
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1981.tb03779.x
Subject(s) - annulus (botany) , ageing , biology , fin , trout , brown trout , fish <actinopterygii> , fish fin , fishery , botany , materials science , composite material , genetics
Ageing of brown trout from their fin rays is a valid method. Fin‐ray ages agreed with length‐frequency ages 84% of the time during the year, but agreement was only 66% during annulus formation (October‐December) compared with 94% during the rest of the year The seasonal record of the annulus at the edge of the ray only weakly validated the technique, but this was caused by difficulty in distingushing the winter growth band when it was outermost on the ray. The first annulus was usually not apparent in older fish; this could cause systematic underageing. Ageing from fin rays should be assessed prior to use in each situation.