Biotic and Abiotic Influences on Corticosteroid Hormone Rhythms in Channel Catfish
作者:
KennethB. Davis,
MaryAnna Suttle,
NickC. Parker,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1984)
卷期:
Volume 113,
issue 4
页码: 414-421
ISSN:0002-8487
年代: 1984
DOI:10.1577/1548-8659(1984)113<414:BAAIOC>2.0.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Plasma-corticosteroid concentrations in resting channel catfish Ictalurus punctatus held at 21 C varied only slightly during a 24-hour period; further, increases in hormone concentrations induced by confinement stress were independent of time of day and photoperiod. Temperature strongly affected both resting corticosteroid concentrations and the dynamics of hormone secretion when fish were stressed. Resting concentrations were greatest in fish acclimated to 5 and 10 C (25–29 ng/ml), sharply lower in fish held at 15, 20, or 21 C (5–9 ng/ml), and intermediate in fish maintained at 25, 30, or 35 C (12–13 ng/ml). Hormone concentrations increased when fish were stressed by confinement. Corticosteroid concentrations hardly changed in fish held at 5 or 10 C, but increased markedly in fish at higher temperatures; in addition the response was more delayed at the lower temperatures.
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