Potential resources of narrow clawed crayfish (Astacus Leptodactylus) in lakes and reservoirs of the belarusian part of the Western Bug
Abstract
The biomass of the fished part of narrow-clawed crayfish Astacus leptodactylus was estimated in the main lakes and reservoirs of the Belarusian part of the Western Bug basin. Populations of narrow-clawed crayfish are found in all lakes, reservoirs, quarries, ponds and large rivers of the Western Bug basin. The density of crayfish individuals was determined from the average movement distance of crayfish (10 meters) and the catch factor of 0,5. The traps that were used during fishing consisted of two baskets and a net between them. The net was fixed vertically along the inlet openings. The traps were set without bait in the morning and taken out the next day before noon. The traps are called «Zhaki» in the Polesie region of the country. The calculated fishing area of one crayfish trap if 20 m2/day. The density of crayfish individuals varied from 0,003 to 0,26 individuals/m2. The crayfish individuals were measured from the tip of the rostrum to the end of the telson and weighed individually with an accuracy of 0.1 grams. In order to determine the mass of an individual from a known length, the corresponding equations were calculated, which were determined separately for males and females. The total biomass of the harvested part of the population was calculated from the average values of density, length of the individuals, and mass to length dependence of the individuals. The total biomass of the fished part of narrow-clawed crayfish population of the main lakes and reservoirs in the Belarusian part of Western Bug basin is estimated at 20 tons. The material was collected on May, 2017.
About the Authors
A. V. Alekhnovich
Scientific and Practical Centre of the National Academy of Sciences of Belarus for Bioresources, Minsk
Belarus
Belarus
K. A. Slivinskaia
Scientific and Practical Centre of the National Academy of Sciences of Belarus for Bioresources, Minsk
Belarus
Belarus
D. V. Molotkov
Scientific and Practical Centre of the National Academy of Sciences of Belarus for Bioresources, Minsk
Belarus
Belarus
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Review
For citations:
Alekhnovich A.V., Slivinskaia K.A., Molotkov D.V. Potential resources of narrow clawed crayfish (Astacus Leptodactylus) in lakes and reservoirs of the belarusian part of the Western Bug. Natural resources. 2018;(1):65-71. (In Russ.)
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