In accordance with the Conservation Measure 41-07 (2009), a survey was conducted in order to collect information for the stock status and biological information on toothfish in the southeast sector (24 allocated points) of Division 58.4.3b (Banzare Bank), using a commercial bottom longline vessel Shinsei Maru No. 3, from December 1 to 13, 2009. Shinsei Maru Trot line system was used as fishing gear. Total catch (excluding released weight) of Dissostichus spp. And the other by-catch species was 15.9 tonnes in the SE sector, where the catch limit of 18 tonnes was set. Dissostichus spp. Made up 16 % in number and 87.5 % in weight of the whole fish caught, while Macrourus spp. Made up 81% in number but only 11 % in weight to the total. Among two species of toothfish, Dissostichus mawsoni was dominant (82 % in number and 88 % in weight to the total). Mean CPUE of D. mawsoni was 3.4 indiv. / 1,000 hooks in number and 111 kg / 1,000 hooks in weight. D. mawsoni showed a broad modal composition at approximately 130-150 cm. Total of 60 individuals of toothfish were tagged and released during the survey. One male D. eleginoides was recaptured.
Preliminary reports on stock status and biological information on toothfish obtained from the scientific research survey by Shinsei Maru No. 3 in 2009/10 in the SE sector of Division 58.4.3b
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WG-SAM-10/13
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