Specific features of growth and energetics of juvenile rainbow trout Parasalmo (Oncorhynchus) mykiss at constant temperature and its short-time periodic deviations into the upper suboptimal zone

It was shown that short-time periodical temperature fluctuations within the upper temperature zone suboptimal for the growth of juvenile rainbow trout Parasalmo ( Oncorhynchus ) mykiss exerts a favorable effect on the growth and energetics of fish. Under variable temperature conditions, an increase...

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Bibliographic Details
Published in:Journal of ichthyology 2011-08, Vol.51 (7), p.528-535
Main Authors: Zdanovich, V. V., Pushkar’, V. Ya, Kelekhsaev, M. Z.
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Life Sciences
Oncorhynchus mykiss
Parasalmo
Zoology
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Summary:It was shown that short-time periodical temperature fluctuations within the upper temperature zone suboptimal for the growth of juvenile rainbow trout Parasalmo ( Oncorhynchus ) mykiss exerts a favorable effect on the growth and energetics of fish. Under variable temperature conditions, an increase in the rate of growth and improvement of energetic and production indices of juvenile trout, as compared to constant thermal conditions optimal for growth, are observed. Efficiency of food conversion is increased, and oxygen expenditure for the gain of body weight unit is decreased. Optimization of life activity and energetics of rainbow trout observed under variable temperature conditions indicates the need for subsequent discussion and clarification of the concept of an ecological optimum with respect to the temperature factor for fish and other poikilothermal hydrobionts.
ISSN:0032-9452
1555-6425
DOI:10.1134/S0032945211030155