Seasonal formation of annual rings on the scales of Baikal grayling inhabiting the middle reaches of the Yenisei River under altered temperature regime : научное издание
Библиографическое описание:Seasonal formation of annual rings on the scales of Baikal grayling inhabiting the middle reaches of the Yenisei River under altered temperature regime : научное издание / I. V. Zuev, P. Y. Andrushchenko, T. A. Zotina. - Текст : непосредственный // Environmental Biology of Fishes. - 2021. - Т. 104, № б/н. - P. 1293-1302. - ISSN 0378-1909. - ISSN 1573-5133, DOI 10.1007/s10641-021-01155-y.
Аннотация:The seasonal formation of annual rings on the scales of Baikal grayling from the middle reaches of the Yenisei River has been studied to find out the reasons for the high growth rate of the grayling under altered temperature regime downstream of the dam of the Krasnoyarsk Hydroelectric Plant. The number of circuli outside the last identified annuli and in the second, third, and fourth completed annuli was estimated on 569 fish caught during the annual cycle. The von Bertalanffy growth function was used to describe the increment in the number of circuli over a year. The calculation showed that a new annual ring was produced in July. In November, there was no statistically significant difference between the circulus number in scale increment and the circulus number in the corresponding completed annuli of older fish. Thus, despite the increased duration of the period with optimal water temperatures downstream of the dam of the Krasnoyarsk Hydroelectric Plant, fish growth was observed in a limited period of the year, from July to November. The probable reason for the high growth rate of grayling in the study area is that the fish do not have to waste energy on seasonal migration to the tributaries. Taking into account that grayling biomass production in the middle Yenisei occurs from July to November, we can recommend shifting the dates of commercial fishing for grayling to the end of this period—November–December.
Издательство:Springer Science+Business Media B.V., Formerly Kluwer Academic Publishers B.V.
Источник:Environmental Biology of Fishes
Выпуск:Т. 104
Номера страниц:1293-1302
Держатель оригинала документа:Institute of Biophysics,Federal Research Center “Krasnoyarsk Science Center SB RAS”, Institute of Fundamental Biology and Biotechnology,Siberian Federal University
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