WG-KRILL/CEMP-94

The model of the krill fishery presented in 1993 (wg-Krill-93/14) refined and applied to both Japanese and Chilean krill fishing fleets in Subarea 48.1. A stochastic element is introduced to account for variability in catch rates. The most successful management regime is found to be one which restricts fishing within 75 km of breeding penguins during January and February. For this regime the Read More
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Preliminary analyses of this topic identified some problems with the data originally submitted. To clarify these problems and to provide additional data to enhance the accuracy and relevance of the overall model, this paper provides quantitative information on potential biases associated with estimation of survival rate, observed rates of population increase (both maxima and at study colonies Read More
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Being prepared by a collective of authors, this paper demonstrates some approaches to mathematical modelling of Antarctic krill population in the Cooperation Sea. The choice of investigation area is not casual since there are data on YugNIRO long-term observations over kri11 biological state here, its stocks, other pelagic system components, inhabitancy conditions, landing by FVs for the Read More
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The CCAMLR Secretariat has been requested to provide annual calculations of the catch of krill within the critical period-distance of land-based predators in Subareas 48.1 and 48.2 (100km from colonies, December - March). This index of the overlap of predators and the fishery is unsuitable for a number of reasons. An alternative method of calculating an index of fishery-predator interaction is Read More
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The distribution and abundance of Antarctic krill (Euphausia superba) were estimated from four acoustic surveys conducted in the vicinity of Elephant Island, Antarctica, from mid-January to mid-March, 1994. The first and last surveys covered approximately 15,000 n.mile2 around Elephant Island and the eastern end of King George Island; the second and third surveys covered approximately 2100 n. Read More
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Dynamics of distribution, growth, life span and feeding were studied in the endemic Antarctic euphausiid Euphausia crystallorophias in the central part of the Indian sector of the Southern Ocean during the austral summer, from 1977 to 1990, and in the Lazarev Sea during the summer 1990/91. Both larvae and adult E.crystallorophias were found in abundance in shelf waters of 100-500 m depth. Read More
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Since penguins rely on the main planktonic resources of the Southern Ocean, knowledge of their diet may be used for monitoring these resources. During winter and spring of 1987 and 1989, we investigated the composition of the diet of gentoo penguins, Pygoscelis papua, in relation to changes in the availability of two prey species, Euphausia vallentini and Themisto gaudichaudii, sampled during Read More
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Predator-prey interactions play an important role in determining the dynamics of pelagic ecosystems. Human intervention in such interactions can have effects that cascade throughout these ecosystems. Recently, concerns have arisen due to the commercial harvesting of Euphausia superba, the Antarctic krill, a keystone prey species in the Southern Ocean food web. It has been difficult to evaluate Read More
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The consumption of food by the four species of breeding penguins at the Prince Edward Islands is assessed on an annual and seasonal basis. Total annual food consumption was estimated at 880 000 t, of which king penguins accounted for 74%, macaroni penguins 21%, rockhopper penguins 5% and gentoo penguins <1%. Pelagic fish, almost entirely myctophids, were the most important prey (70% of Read More
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This paper is a revision of the assessment of the competition between the Japanese krill (Euphausia superba) fishery and penguins (WG-Krill-93/7). Main fishing areas were confined to the slope and shelf to the north of either Livingston or Elephant Islands. In contrast, main foraging areas of penguins are considered to be formed in areas to the north of King George, Nelson and Robert Islands, Read More
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