Abstract
The article focuses on the special trend in technology of fish reproduction - use of a recirculated aquaculture system that allows creating optimum hydrological and hydrochemical parameters for a certain fish species regardless of the environmental conditions. Nevertheless, in the course of developing the new modifying factors of the environment (simulated conditions) the common orientation of a metabolism or separate biochemical reactions, in particular, generative exchange can be broken. It has been stated that dynamics of biochemical indexes of blood and urine characterizes intensity and orientation of generative exchange and allows to estimate possibility of structural transformations of fish ovaries. The analysis of the influence of a synthetic analog of hormone luliberin - surfagon on hybrid females of Russian × Lena sturgeon ( Acipenser guldenstadtii Brandt, 1833 × Аcipenser baerii Brandt , 1869) characterized by low fatness has revealed the stimulation of metabolic processes. During the research a low level of protein (16.0-28.0 g/l) under the influence of surfagon has increased by 35.0-38.0%. At the same time, throughout all experiment a high level of beta lipoproteins was observed in fishes of both pilot and control groups. Under the preparation impact the level of beta lipoproteins increased by 58.0% and 61.0% after injecting 0.2 mkg/kg and 2.0 mkg/kg of surfagon, respectively. The similar tendency was observed in the course of study of the hormones predecessor - cholesterol. Under the influence of surfagon in various doses there has been registered its increase from 1.3 g/l to 2.2-2.3 g/l. Thus, the surfagon injected groups of fish demonstrated a particular type of the biochemical status and reacted to hormonal stimulation under the low level of financial and energy resources. At the same time, histologic research hasn’t revealed cardinal changes in gonad morphology.
Highlights
The article focuses on the special trend in technology of fish reproduction - use of a recirculated aquaculture system that allows creating optimum hydrological and hydrochemical parameters for a certain fish species regardless of the environmental conditions
It has been stated that dynamics of biochemical indexes of blood and urine characterizes intensity and orientation of generative exchange and allows to estimate possibility of structural transformations of fish ovaries
The analysis of the influence of a synthetic analog of hormone luliberin - surfagon on hybrid females of Russian × Lena sturgeon (Acipenser guldenstadtii Brandt, 1833 × Аcipenser baerii Brandt, 1869) characterized by low fatness has revealed the stimulation of metabolic processes
Summary
У контрольной и опытных групп русско-ленского осетра, характеризующихся низкой упитанностью, концентрация гемоглобина в крови находилась в пределах нижней границы диапазона (50,0–80,0 г/л), установленного для рыб в процессе нерестовой миграции в природных условиях Анализ вариабельности бета-липопротеидов у опытных самок гибрида русско-ленского осетра в вариантах с инъекцией сурфагона в дозах 0,2 и 2,0 мкг/кг выявил ранее установленную тенденцию к увеличению транспорта этого биохимического субстрата у осетровых рыб при естественном созревании рыб в ходе нерестовой миграции [27]. Заключение Таким образом, у экспериментальных особей русско-ленского осетра, имеющих для данной возрастной категории исключительно низкую упитанность, характерную для производителей осетровых рыб после нереста в природных условиях, под влиянием сурфагона выявлена активизация транспорта в крови белка, бета-липопротеидов и холестерина – важнейших биохимических компонентов процесса формирования половых продуктов. Поэтому управление функциональной направленностью биохимических реакций в процессе формирования половых продуктов у осетровых рыб в УЗВ с применением искусственных кормов должно осуществляться через гормональное регулирование темпа первоначального накопления оптимальной массы тела с прицелом на дискретное формирование соматической и генеративной части гонад с учетом генетически обусловленных потенций исходных видов
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