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Effects of DL–thyroxine on swimming speed in pearl danio Brachydanio albolineatus (Blyth)
Author(s) -
Katz Anne Harris,
Katz Harvey M.
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.tb04198.x
Subject(s) - biology , zoology , acclimatization , hormone , photoperiodism , thyroid hormones , significant difference , fishery , endocrinology , medicine , ecology , botany
Pearl Danios (Brachydanio albolineatus –Blyth) were allowed four days for acclimation in river‐water filled aquaria maintained at a mean temperature of 27° C. A different concentration of DL‐thyroxine (T 4 ) was added to each of two aquaria. A third aquarium served as a control and received no hormone. Photoperiod, feeding, aeration, and observer interference were controlled so as not to influence the results of the study. Mean swimming speeds for the fish in each aquarium were calculated. Data were subjected to analysis of variance and the Student‐Newman‐Keuls Test. Compared with the control, significant (P < 0.05) increases in swimming speed were found with concentrations of thyroxine in water of 1:4x 10 6 and 1:1 x 10 6 . The difference in swimming speed between the two hormone‐treated groups was not significant. The fact that exogenous thyroxine will increase swimming speed may indicate that endogenous thyroid hormone plays a significant role in such fish behaviour as migration.