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Daily growth increments in the otoliths of Atlantic salmon parr, Salmo salar L., and the influence of environmental factors on their periodicity
Author(s) -
Wright P. J.,
Rowe D.,
Thorpe J. E.
Publication year - 1991
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.1095-8649.1991.tb04345.x
Subject(s) - salmo , otolith , sagitta , biology , photoperiodism , fish <actinopterygii> , fishery , salmonidae , zoology , horticulture
Daily increments were demonstrated in the sagitta otoliths of fast‐ and slow‐ growing Atlantic salmon parr, Salmo salar L., when held under natural photoperiod and temperature. Otolith increments continued to be deposited at a daily rate when fish were held under constant light and/or temperature and on single or multiple feeding regimes. However abnormally short photoperiods of 6L: 6D induced two increments per day. The results suggest that an endogenous rhythm, synchronized lo light/dark transitions within a 24 h period, controls otolith increment deposition.