Natural age-dependent mortality rates of Antarctic krill Euphausia superba Dana in the Indian sector of the Southern Ocean |
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| Authors: | E A Pakhomov |
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| Institution: | (1) Southern Scientific Research Institute of Marine Fisheries and Oceanography (YugNIRO), 2 Sverdlov Street, 334500 Crimea, Kerch, Ukraine;(2) Present address: Southern Ocean Group Department of Zoology and Entomology, Rhodes University, P.O. Box 94, 6140 Grahamstown, South Africa |
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| Abstract: | Data on the size and age composition of Antarctic krill (Euphausia superba Dana) were collected in the Cooperation and Cosmonaut Seas (Indian sector of the Southern Ocean) from 1985 to 1990. The estimation of the age-dependent annual extinction rate of krill  =1-exp(-M)] was obtained using the Zikov and Slepokurov (1982) approach and results were fitted by a parabolic equation. The coefficients of instantaneous natural mortality (M) of E. superba derived with this approach range from 0.52 during the maturation period, to 1.1–2.41 during the first and last years of life. |
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