The role of silver bream (Blicca bjoerkna L.) in the formation of ichthyocenoses of small water bodies in the Kaliningrad region
Year: 2024
Type: article
Abstract: Structural parameters (frequency of occurrence, catches per unit effort in number and biomass) are considered, which make it possible to characterize the role of species in the ichthyocenosis and determine the ways of fishery exploitation of aquatic biological resources. The frequency of occurrence is analyzed as a structural parameter of the species structure of the ichthyocenosis and as a characteristic that allows one to determine the optimal mesh size of fixed gill nets. Data from 1.141 catches and 8.205 individuals were analyzed. A comparative analysis of the structural characteristics of silver bream in different types of water bodies of the Kaliningrad region was carried out using the example of Lake Marinovo, the Sokolniki Quarry and the Staraya Dam Pond. The frequency of occurrence of silver bream in the studied water bodies ranges from 56 to 73%. The frequency of occurrence of silver bream in fixed nets of different mesh reaches maximum values in fixed nets with mesh size of 14 to 30 mm in the Staraya Dam Pond and reaches high values in all studied water bodies in fixed nets with mesh size of 20 to 27 mm. With increasing mesh size, the frequency of occurrence of silver bream decreases, with the exception of the Sokolniki Quarry. In the studied water bodies, silver bream predominates in small-mesh fixed nets with a mesh size of 14-18 mm, with the exception of the Sokolniki Quarry, where the dominance of medium-sized silver bream (14-17 cm) was also noted. The silver bream is the “core of the ichthyocenoses” of the studied water bodies according to the three parameters studied and belongs to numerous species in terms of numbers and biomass. The size-weight and some biological indicators of the silver bream in the studied water bodies are similar. In these water bodies, the silver bream can be used as an object of amateur and sports fishing.
Author: Yuliya Kazimirovna Aldushina
Institution: Kaliningrad State Technical University
Language: English
Subfield: Aquatic Science
Domain: Life Sciences
SDG: Life below water
Open Access status: diamond
OpenAlex ID: W4403136632