Evaluation of density and biomass of arctic charr Salvelinus alpinus (L.) complex (Salmoniformes, Salmonidae) from two oligotrophic lakes in Krasnoyarsk Territory

Abstract

The paper considers the method of fish density estimation by gill net catches of different mesh size. The method is based on the analysis of the number of fish of different size groups approaching the net by simulating the movement of fish resulting in interaction with the net. The method include technical parameters of the net, morphometric features of fish and their behavioral characteristics. The process of interaction between fish and gill net is splitted into a series of sequential stages, each of which has its own probability calculated. The parameters necessary for the calculation are obtained from the primary analysis of catches and partly from literature data. For abundance estimation, its sensitivity to a number of key model parameters is shown.
Density estimates were obtained for Arctic charr Salvelinus alpinus (L.) from various locations in Lama and Kapchuk lakes, Krasnoyarsk Territory.