Effect of methyltestosterone on physiological state and rheoreaction of rainbow trout Parasalmo mykiss (=Oncorhynchus mykiss) under unfavorable keeping conditions


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Abstract

The effect of methyltestosterone given with feed during one and two months on the state of gonads, the level of thyroid, and sex steroid hormones in blood and on rheoreaction is studied in juvenile rainbow trout Parasalmo mykiss (=Oncorhynchus mykiss) raised under unfavorable conditions (tropics, Vietnam). In comparison with the control, in the experimental group, the part of sterile specimens was higher (83 vs. 35%), the part of males was lower (17 vs. 40%), while females and hermaphrodites were absent. At prolonged starvation (12 days), the experimental specimens demonstrated lower increase of the level of thyroid and sex steroid hormones in blood than that in the control specimens. Methyltestosterone modified the behavior of rainbow trout in water flow: delivery of the hormone in food during 1 month increased the part of fish moving against the flow and suppressed movement both upstream and downstream during 2 months. Thus, methyltestosterone negatively influences the physiological condition and adaptation capacity of rainbow trout.

About the authors

E. D. Pavlov

Institute of Ecology and Evolution

Author for correspondence.
Email: p-a-v@nxt.ru
Russian Federation, Moscow, 119071

E. V. Ganzha

Institute of Ecology and Evolution

Email: p-a-v@nxt.ru
Russian Federation, Moscow, 119071

V. Yu. Ponomareva

Institute of Ecology and Evolution

Email: p-a-v@nxt.ru
Russian Federation, Moscow, 119071

V. V. Kostin

Institute of Ecology and Evolution

Email: p-a-v@nxt.ru
Russian Federation, Moscow, 119071

D. S. Pavlov

Institute of Ecology and Evolution

Email: p-a-v@nxt.ru
Russian Federation, Moscow, 119071

Vo Thi Ha

Russia–Vietnam Tropical Research and Technology Center

Email: p-a-v@nxt.ru
Viet Nam, Ho Shi Minh

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