Modeling of the rainbow trout feeding in the cage complex of the "russian Sea - Aquaculture" company

Abstract

The paper describes three models of feeding rainbow trout used in the cage complex of LLC "Russian Sea - Aquaculture". It is shown that the most effective is the method that combines models of three, two, and one-time feeding of rainbow trout. Fish diseases negatively affect feeding efficiency. With the onset of diseases, feed intake decreases sharply. Under marine conditions, rainbow trout are often affected by the salmon copepod Lepeophtheirus salmonis, which damages the mucous membrane and feeds on the blood of fish. Timely use of medicinal feed and chemical delasing has a positive effect on the physiological state of fish and feeding efficiency is restored. It was found that when choosing a feeding model, it is necessary to take into account the length of daylight hours. With an increase in daylight hours in fish, feed saturation increases, and with a decrease in daylight hours, on the contrary, decreases. Maturity stage in cage trout occurs faster than in wild-living individuals, which must also be taken into account when drawing up the feeding regimen. When developing a model for feeding rainbow trout, it is necessary to control the content of dissolved oxygen in the water. With a decrease in oxygen concentration, the fish experiences stress, and food saturation decreases. It has been established that the main factors affecting the choice of feeding model are water temperature, daylight hours, average weight of fish in the cage, physiological state of the fish and its maturity stage. The selection of the most appropriate model should be based both on the biological characteristics of the fish grown and on environmental factors.