Evaluation of the potential abundance and biomass of commercial benthic fish in the Yalpug and Kugurluy lakes (Ukraine)
Journal Title: Scientific Annals of the Danube Delta Institute - Year 2014, Vol 20, Issue
Abstract
The paper deals with assessment of the potential abundance and biomass of commercial species of benthophagous fish from Yalpug-Kugurluy lake complex. The proposed method of calculation is based on analysis of feeding base, volume of catches of separate fish-species, sex, populations’ size and age composition, feeding and breeding. The basis for calculation of potential fish production is the total production of macrozoobenthic during the growing season. Fluctuations of environmental factors are also considered. This algorithm takes into account biological and ecological parameters of the species and changes in environmental factors, providing higher estimation accuracy compared with methods used in aquaculture (based only on calculation of the total amount of feed rate). Significant feeding on macrozoobenthic by Gobiidae negatively affects the productivity of valuable commercial benthophagous fish. Drainage and irrigation works were proposed to increase the number of valuable predatory species – Sander lucioperca - for which gobies are important food-components. The method of potential fish production assessment is suggested for being used in management of fisheries in lake ecosystems. The calculated values indicate the potential capacity of feeding base of reservoirs, i.e. allowing the assessment of the maximum number of individuals and biomass at a certain ratio of fish species. To increase fish production of commercially valuable species in lakes Yalpug and Kugurluy, more intense stocking of Cyprinus carpio is proposed. This will facilitate the most effective use of feeding base by benthophage fish that will lead to a significant increase in catches valuable species of carps in these lakes.
Authors and Affiliations
ZAMOROV Veniamin, LEONCHYK Yevgen, ZAMOROVA Maria, DZHURTUBAEV Michael
Keywords
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