Growth and age/length structure of populations of Notothenia (Lepidonotothen) squamifrons (Nototheniidae) in various areas of the Indian sector of the Southern Ocean

摘要

Age, growth and age/length composition of populations of grey rockcod (Notothenia (Lepidonotothen) squamifrons), inhabiting areas of the Ob and Lena Banks and the Kerguelen Island Shelf, are presented in this paper. It was found that during the first years of life the linear growth rate is 3 to 5 cm per year. It decreases by a maximum of 1 cm during the last years of life. Maximum annual weight increments of 100 to 120 g at the banks and 153 to 188 g in the Kerguelen Island area were recorded for fish at age 6 to 12. Growth parameters were calculated according to Bertalanffy’s equation. The dynamics of age/length composition of catches are also examined in this paper. On the Ob and Lena Banks this composition is fairly stable but on the Kerguelen Shelf there is a tendency towards younger fish being more abundant.