Title

Photoperiod and Diel Variations of Serum Cortisol, Thyroxine and Protein in Goldfish, Carassius auratus L.

Document Type

Article

Publication Date

1983

Publication Title

Journal of Fish Biology

ISSN

0022-1112

Volume

23

Issue/No.

6

First Page

705

Last Page

710

Abstract

Goldfish Carassius auratus L., were held for 1 month on one of four different photoperiods. In those groups with diel variations of serum cortisol and thyroxine (approximately 60%) the variations were entrained to the photoperiod; peak titres occurred around light onset, minimum titres at light offset. Fish held on two of the photoperiod regimes had diel variations in serum protein, however, the pattern was not consistent in relation to any aspect of the photoperiod.

DOI

10.1111/j.1095-8649.1983.tb02947.x

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