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Long-term dynamics of the spatial distribution of European vendace (Coregonus albula L.) of Lake Vishtynetskoye, Kaliningrad region

Year: 2024
Type: article
Abstract: European vendace in the Kaliningrad Region is represented only in Lake Vishtynetskoe. It is a valuable com-mercial species and it was actively used by fishing in the 70-80s of the 20th century. Its annual catch reached 29 tons with an average catch of 16 tons. However, currently catches of this fish do not exceed 2 tons while a recommended volume is 12 tons. Modern studies have shown a decrease in size characteristics and a high vendace population in Lake Vishtynetskoe. In order to increase the efficiency of targeted fishing for this species in a reservoir and determine areas of the water area in which it forms high concentrations, its spatial distribution was studies over the period from 2014 to 2021 by conducting night hydroacoustic surveys. Processing of echograms made it possible to obtain quantitative characteristics of the densities of vendace aggregations along the ship’s route. By using of geographic information systems for each section of lake, for which fishing squares were selected, the average concentration of this species were determined. An average density of aggregations for the considered series of years, amounting to 10,000 specimens/ha, was chosen as a measure of high concentration. The results of the studies showed that in different years high densities of vendace aggregations are formed in different parts of the lake and the number of population does not reliably affect the number of such ar-eas. Spatial analysis showed that during the period under review consistently high concentrations of this species were observed annually in only two fishing squares and its can be recommended for targeted vendace fishing.
DOI: 10.24143/2073-5529-2024-3-33-41
Language: English
Open Access status: diamond
OpenAlex ID: W4403136645
FWCI:
Cites: 4
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Related to: 10