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The Involvement of Thyroid Hormone Metabolism in Gilthead Sea Bream ( Sparus auratus ) Osmoregulation
Author(s) -
KLAREN PETER H. M.,
GUZMÁN JOSÉ M.,
MANCERA JUAN MIGUEL,
GEVEN EDWIN J. W.,
FLIK GERT
Publication year - 2005
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1327.062
Subject(s) - osmoregulation , euryhaline , hormone , thyroid , endocrinology , medicine , gill , salinity , biology , fishery , ecology , fish <actinopterygii>
A bstract : We have investigated the effect of adaptation to low salinity water on the thyroid status of the euryhaline teleost, Sparus auratus . We show that, following low salinity adaptation, the plasma T 4 concentration increases and branchial deiodination activities of T 4 , T 3 , and rT 3 decrease. Moreover, branchial and hepatic enzyme activities that are putatively involved in thyroid hormone metabolism respond differentially in low salinity conditions. Our results indicate the involvement of thyroid hormones in Sparus auratus osmoregulation. Moreover, the gills appear well equipped to play an important role in the modulation of plasma thyroid hormone titers.