Summary
10 species of Mysidacea were sampled during the Polarstern and Walther Herwig SIBEX cruises to the Antarctic Peninsula region from 1983 to 1986. The commonest were Antarctomysis maxima, A. ohlini and Mysidetes posthon. For these species the size and maturity stage composition as well as the length-weight relationships are given. The species considered are growing slowly and attain a long life span, M. posthon reached age class 3+, A. ohlini at least lived as long as 5 years, while A. maxima was found to be of age 5+ in the Peninsula area and probably 6+ in the Weddell Sea. The generation time of Antarctomysis species was 4 years and 3 years in Mysidetes posthon. Fecundity was low, mean number of offspring was about 13 for M. posthon and 21 for A. maxima. Rematuration was observed for the species A. maxima, indicating several spawning events during its life span. Biomass production is low for A. maxima, shown by a P/B-index of 0.98. Mortality of this species was estimated to be Z=1.1, which indicates that 33% of the specimens of an age group survive until the next year. The distribution and spatial separation of the two Antarctomysis species is discussed.
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Siegel, V., Mühlenhardt-Siegel, U. On the occurrence and biology of some Antarctic Mysidacea (Crustacea). Polar Biol 8, 181–190 (1988). https://doi.org/10.1007/BF00443451
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DOI: https://doi.org/10.1007/BF00443451