Feeding of Burbot Lota lota in Modern Conditions of the Kuybyshev Reservoir

Abstract: The feeding of burbot Lota lota was studied in the modern conditions of the Kuibyshev Reservoir. With the decrease in the abundance of ruff Gymnocephalus cernuus in the reservoir, gradual establishing of gobies (Gobiidae) within the ruff range began. Recently, gobies form the basis of the of burbot diet. The dominance of alien species in the diet of burbot indicates that this predator may play the role of a regulator of the number of invasive fish species and of a biological ameliorator in waterbody

New approach to assessing the state of fish stocks on the example of bream

© 2020 Publishing House "O- Kratkoe". All rights reserved. This paper substantiates a new approach to the protection of fish resources, based on the transition from the concept of a calculated forecast of catches and quotas to a multilevel system for assessing the status of fish populations under conditions of slow flow. The main levels of the fish population monitoring system are considered. A new approach based an analysis of monitoring results of the main structural and functional population characteristics of fish, on data on the dynamics of the population size and its generations, changes in the age structure, growth rate, abundance of individuals with morphological anomalies. A new approach was tested on the example of a model species of bream (Abramis brama L.) in the Kuibyshev reservoir as a common inhabitant of different morpho-hydrological properties of reservoirs in Europe, belonging to the LC group according to the IUCN classification. An array of new scientific data has been obtained. Based on the calculation of natural mortality by approximating the population curve, taking into account the age composition of catches, it is shown that with a stable replenishment of the fishing herd, when high- and small-numbered generations enter the fishery, depending on the spawning conditions, bream stocks are not expected to be undermined. The results of the study can be used as a basis for assessing the state of fish populations, developing measures for the rational development of their reserves in conditions of unstable hydrological regime of reservoirs and weakening of control over fishing in the protection of fish resources