Summary
The growth ofNotothenia squamifrons is analysed using scale reading of specimens from various isolated areas of the Indian sector of the Southern Ocean (Kerguelen, Crozet and Marion Islands; Ob, Lena and Kara-Dag seamounts). Studying reproductive biology reveals that spawning is annual and occurs during austral spring. Hatching takes place in summer. Scaling is set during the autumn. The smallest scaled fish measure 3.8 cm in total length. The data mentioned above, the check number on the scales and the sampling dates lead to the identification of the different age groups. Differences in growth rate appear between the studied areas. The fastest growth is observed around the Kerguelen Islands where the oldest specimens are 19 years old and reach 52 cm in total length. On the other hand, in the Crozet population,N. squamifrons does not live more than 12 years for a maximum length of 30 cm. Scale reading in fish from the Ob and Lena seamounts shows a minor decrease in growth during the winter season when compared to that in the other areas. The hydrographical conditions of this sector of the Southern Ocean may, in part, explain these differences: especially temperature and plankton biomass seem to effect growth rate. The cold antarctic waters and the highest plankton productivity, inducing the optimal growth rate, are found in the Kerguelen Islands.
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Duhamel, G., Ozouf-Costaz, C. Age, growth and reproductive biology ofNotothenia squamifrons gunther, 1880 from the Indian sector of the Southern Ocean. Polar Biol 4, 143–153 (1985). https://doi.org/10.1007/BF00263877
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DOI: https://doi.org/10.1007/BF00263877