PECULIARITIES OF THERMOPREFERENCE IN SOME FISH SPECIES INHABITING THE WATERS OF THE UPPER VOLGA
Journal Title: Вестник Астраханского государственного технического университета. Серия: Рыбное хозяйство - Year 2013, Vol 0, Issue 3
Abstract
The purpose of this study is to determine the final selected temperature unit (FST) and the peculiarities of thermopreference in experimental temperature gradient in 14 fish species from 7 families at the age 0+…3+ in the summer and autumn seasons. While determining the preference temperature during the initial period of operation and stable range of preference the method of "final termopreferendum" in which the fish is provided with the possibility of free temperature choice in a thermal gradient, is used. Duration of experiments is ranged from 6 to 16 days. Two types of gradient installations different in size and design features are used. The initial temperature of fish acclimation is from 14 to 22 °C. The minimum value of the FST was found in third-fourth-year stone-loach – 15.1 °C, the maximum one – in the young of the fingerlings Amur sleeper – 30.0 °C. High FST values of the two thermophilic species, goldfish – 29.2 °C and carp – 28.7°C are also shown. FST indicators were fixed in three invasive species such as Amur sleeper (30.0 °C), and the two species of gobies – big-head goby and tubenose goby (22.4 °C). The peculiarities of thermoregulatory behavior of the juvenile and more adult fish and also the rate of their FST choice zones provided by temperature gradient environment are considered. The data can be used as variables characterizing the optimal or near-optimal temperature conditions of vital activity of fish of different age groups.
Authors and Affiliations
Golovanov Konstantinovitch , Verbitsky Borisovich , Kapshay Sergeevich , Mavrin Sergeevich , Vlasova Andreevna
Keywords
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