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Distribution, Abundance and population structure of the Antarctic krill (Euphausia superba Dana) in the Prydz Bay region, Antarctica

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Summary

This paper presents results of net sampling carried out on four marine science cruises, between 1981 and 1985, in the Prydz Bay region of Antarctica by the Australian Antarctic Division. Krill exhibited a patchy distribution and overall low abundance. The majority of sampling sites in January 1985 returned no post-larval krill or densities of <1 individual 1000 m-3. The estimated mean abundance of E. superba in January 1985 was 6 individuals or 2 g (wet wt.) 1000 m-3 integrated for the upper 200 m of the water column which represented 3.4% of the total zooplankton biomass. No more than five years-groups, including the larvae, were observed in Prydz Bay, with mean lengths of groups 1+, 2+, 3+ and 4+ being 24, 38, 46 and 53 mm (standard 1), respectively in the middle of January. A high proportion of naupliar stages observed in January 1985 indicated that spawning in Prydz Bay begins in January and examination of adult maturation showed that the spawning continues at least to March.

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Hosie, G.W., Ikeda, T. & Stolp, M. Distribution, Abundance and population structure of the Antarctic krill (Euphausia superba Dana) in the Prydz Bay region, Antarctica. Polar Biol 8, 213–224 (1988). https://doi.org/10.1007/BF00443453

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