Селективные свойства кутков донных тралов на промысле балтийской трески.

Abstract

In 1972-1975 selectivity properties of bottom trawl codend with the mesh size 80 and 90 mm were investigated in the eastern areas of the Baltic Sea. The methods recommended by ICES (external small mesh coverings) were used. It was determined that codends made of capron (polyamid A) with the mesh size 90 mm correspond to the draft of International Fishery Regulations. Connections between the percentage (by number) of non-commercial fish by-catch (L 30.0 cm), the mode of fishery lenght (L max) and non-commercial fish abundance (Nm) in the exploited stock, which may be used for the calculation of minimum permissible sizes of meshes in condend, which meet the requirements of International Fishery Regulations, were revealed.