Monitoring of aquatic biological resources of the Tsimlyanskoye reservoir by ichthyological indicators for operational management of technological processes of аquaculture

The article presents the results of monitoring of aquatic biological resources, as well as the release of juvenile fish from the Tsimlyanskiy fish hatchery. The results showed that the number of catches exceeds the number of released juvenile carp and white bighead. White amur, in turn, prevails more in releases than in catches.

Introduction. Relevance of theme is caused by necessity of increase of fishery value and also increase of exit of commodity production in Tsimlyanskoye water reservoir by means of artificial reproduction of fish stocks. In order to increase valuable fish species in the reservoir, first of all, it is necessary to carry out technical melioration of spawning grounds. Besides, it is important to carry out catching of those species, which are low-productive, namely roach, goose, crucian carp. So, for regular replenishment of commercial stocks with young valuable fish species, namely to partially replace natural reproduction of fish by industrial rearing of juveniles the Tsimlyansk Fish Hatchery was built. The main advantage of such breeding directly before the natural reproduction is a stable receipt of landing material irrespective of a level mode as well as hydrological features of the Tsimlyanskoye reservoir.

Materials and methods. The monitoring works were carried out on the base of the Tsimlyanskiy fishfarming plant and the Volgograd branch of the «All-Russian Research Institute of Fisheries and Oceanography». The objects of the studies were young carp (Cyprinidae), grass carp (Ctenopharyngodon idella) and white silver carp (Hypophthalmichthys molitrix).

Results and conclusions. According to the received data from release of young carp from the Tsimlyanskiy fish-farming factory, it is possible to draw a conclusion that this species of carp has formed its population optimally enough, according to what, release in 2021 was not carried out at all. During the study period, a total of 85.21 tons of young carp, 183.25 tons of white amur and 65.89 tons of white silver carp were released. The catch in the Tsimlyanskoye reservoir within the borders of Volgograd and Rostov regions in dynamics for the period 2018-2021 is: carp – 3669.5 tons, white amur - 104.75 tons, white bighead carp – 316.27 tons.

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