CCAMLR

From the field material collected on the YugNIRO integrated expedition in the Indian Ocean sector of the Antarctic in the season of 1989-1990, information is presented in this paper on ichthyofauna, size–weight composition and main parameters of the biological state of the more abundant fishes taken on the shelf of Antarctica, at Ob and Lena Seamounts (referred to as Banks in the Russian usage), and in the zone of the Southern Polar front.
In the shelf area, of Cooperation Sea, localities of elevated bioproductivity were pinpointed, mixed-species aggregations of Chaenodraco wilsoni and Pseudotrematomus eulepidotus were found in those places. Both seasonal and diurnal trends of the species cooccurrence (i.e. the varying species ratio in the aggregation) were brought out. The bulk of fish examined was made up of matte individuals with gonads in postspawning stages of maturity. Krill was the chief component in the diet of fish.
From census survey by trawl and acoustic means, simultaneous ichthyomass was estimated on Rise "6230" (Storegg Bank), where some 30 thousand tons of fish concentrated over an area of some 50 square miles. Census surveys were carried out also in other areas of the Cooperation Sea shelf and in the subantarctic zone of the Indian Ocean (Ob and Lena Banks).

According to the results of the registered trawling surveys carried out during the joint Soviet-French expeditions (1987-1988), more precise evaluations of the main commercial species biomass in the Kerguelen Islands area are given below. When evaluating the fish stocks, a special attention has been paid to the registration of hurricane samples zones and to the construction of their content evaluations. It is shown in the paper, that the total fish biomass is subjected to considerable variations and is in direct dependence on the quantity of the icefish year-class entering fishery.

The paper “The state of Dissostichus eleginoides stock and TAC for it for 1990/91 season in S.Georgia area (48.3)” presents the data on main biological characteristics of this species (Patagonien Toothfish), caught using long-line bishing in shelf waters of Shag Rocks and S.Georgia. While determining growth rate, size and age composition, natural mortality and catch statistics an attempt was made to determine total biomass of adult toothfish in the area under investigation and the value of possible catch at F0.1 and FMSY.