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Seasonal changes in thyroidal status in the plaice, Pleuronectes platessa L.
Author(s) -
Osborn R. H.,
Simpson T. H.
Publication year - 1978
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.1095-8649.1978.tb04197.x
Subject(s) - pleuronectes , biology , triiodothyronine , hormone , bimodality , thyroid hormones , endocrinology , medicine , thyroid , fishery , zoology , fish <actinopterygii> , physics , quantum mechanics , galaxy
A chemically specific analysis for plasma thyroid hormones has been used to disclose a seasonal bimodality in the concentrations of thyroxine (T 4 ) and triiodothyronine (T 3 ) in the plaice; maxima in both hormone levels occur in winter and in summer. The ratio of T 4 concentrations to T 3 varies seasonally being at a minimum in summer. A highly significant correlation of T 4 plasma levels with the landings per unit fishing effort for the same area has been observed.