Abstract
The article presents a research of the features of embryonic development of clarid catfish (Clarias gariepinus (Burchell, 1822)) conducted at the Southern Scientific Centre of the Russian Academy of Sciences in the period 2016-2019, as well as at the Department of aquaculture and fisheries of Astrakhan State Technical University. The aim of research is to analyze the duration of embryonic development of the clarid catfish (Clarias gariepinus, Burchell, 1822) in early ontogenesis during artificial reproduction, as well as to study changes in the rate of development of clarid catfish at different temperatures and changes in temperature regime. When analyzing the influence of temperature on the embrional development it was found that duration of the initial stages of development changes slightly and the decrease rates of embryogenesis due to a decrease in temperature corresponds to the late stages of the embryo growth, which can be explained by the adaptation to hatching in the most favorable conditions. A description of embryonic development and growth of catfish embryos and pre-larvae is given. During embryogenesis, morphological features that are easily identified and reflect the process of morphogenesis are identified. It has been found that the duration of embryogenesis of clarid catfish, as well as its individual stages, increases with a decreasing water temperature. As a result of the research, it has been inferred that the duration of embryonic development inside the shells is 18-22 hours. The results of observations on the behavior and morphogenesis of pre-larval clarid catfish kept in an artificially formed system are analyzed
Highlights
The article presents a research of the features of embryonic development of clarid catfish (Clarias gariepinus (Burchell, 1822)) conducted at the Southern Scientific Centre of the Russian Academy of Sciences in the period 2016-2019, as well as at the Department of aquaculture and fisheries of Astrakhan State Technical University
The aim of research is to analyze the duration of embryonic development of the clarid catfish (Clarias gariepinus, Burchell, 1822) in early ontogenesis during artificial reproduction, as well as to study changes in the rate of development of clarid catfish at different temperatures and changes in temperature regime
When analyzing the influence of temperature on the embrional development it was found that duration of the initial stages of development changes slightly and the decrease rates of embryogenesis due to a decrease in temperature corresponds to the late stages of the embryo growth, which can be explained by the adaptation to hatching in the most favorable conditions
Summary
2 Astrakhan State Technical University, Astrakhan, Russian Federation The article presents a research of the features of embryonic development of clarid catfish (Clarias gariepinus (Burchell, 1822)) conducted at the Southern Scientific Centre of the Russian Academy of Sciences in the period 2016-2019, as well as at the Department of aquaculture and fisheries of Astrakhan State Technical University.
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