Growth rates in cultured common wolffish (Anarhicahas lupus) and spotted wolffish (A. minor)
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Field caught common wolffish (Anarhichas lupus) and spotted wolffish (A. minor) have been raised from fry on dry pellets. The two species have experienced annual fluctuations in temperature between 6 and 12 °C and the results indicates that both species have there best growth rates below 10 °C. With initial average wet weights of 2.6 g (common wolffish) and 6.3 g (spotted wolffish), and at equal experimental conditions, the spotted wolffish reached four times the wet weight of the common wolffish over a period of two years and 10 months, 3.4 and 0.9 kg respectively. The specific growth rate, however, were 0.62 %d^-1 and 0. 58 %d^-1 respectively, indicating only small differences in growth rates in that period. Estimates based upon the fastest growing fish in the experimental groups indicated that at optimum temperature conditions (approx 6 °C) the spotted wolffish will probably reach a total wet weight of 6 kg in two years from start-feeding, while the common wolffish (below 10 °C) will reach a weight of 3 kg in that same period. The common wolffish mature at a size from 0. 5 - 1. 0 kg, while the spotted wolffish mature at a size above 4 kg.