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Modelling individual growth of the Antarctic krill Euphausia superba Dana

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Growth of the Antarctic krill, Euphausia superba, is not easily determined from net catches nor from laboratory experiments. Therefore, in support of these methods, a phenomenological model was constructed which in its present state describes the growth of a single krill specimen under periodically limiting food conditions with summer seasons of variable lengths. Published data of krill body length vs. age and of the annual cycle of primary production of algae in the Drake Passage were used to formulate equations and to calculate growth curves. At 1,000 days after hatching, the model predicts a body length of 63 mm, growth being delayed by 380 days compared with constant, optimal feeding conditions. Final length, weight and time delay are related to the amount of food supplied and compared with published population growth curves.

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Astheimer, H., Krause, H. & Rakusa-Suszczewski, S. Modelling individual growth of the Antarctic krill Euphausia superba Dana. Polar Biol 4, 65–73 (1985).

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