CCAMLR

As required by Conservation Measure 21-03, Annex 21-03/A, net diagrams and mammal exclusion devices included in Korean krill fishery notifications are submitted by Korea.

Results of longline survey on Antarctic toothfish in the Weddell Sea (Stage II) are presented in the paper. Options I and II of the survey were carried out from February 10 to February 22, 2014. A total of 34 longlines were set: the Option I – 10+20 and the Option II – 4 at the depths ranging from 605 to 2031 m. A total number of hooks - 116 100, fishing area – 13565 km². Catch value of the Antarctic toothfish was 228 t, by-catch – appr. 2 t. CPUE per 1 km main line was 1635 kg at average. As a result of the Research program Stage II the entire measured biomass of the Antarctic toothfish in the Weddell Sea was determined (565 000 t). It was calculated using areal method recommended by CCAMLR (SC-CCAMLR-XXX, 2011; п. 2.40 (ii)). The research Program Stage II in the Weddell Sea accepted by the CCAMLR Commission (CAMLR-XXXII, par. 5.59-6.60) has been successfully completed.

Analytical data on determination of reproductive potential of Antarctic toothfish D. mawsoni in the Pacific (SSRUs 88.1, 88.2, 88.3), Indian Ocean (SSRUs 58.4.1 и 58.4.2) and Atlantic (SSRU 48.6, 48.5) Antarctic areas are presented. Morphological indices of females and males, indices of gonads, fecundity, and condition by Fulton are described. Spawning time and regions for Antarctic toothfish are discussing.

Records of 14 trematode species, collected from bottom fishes from the western and northern parts of the Ross Sea, are given. Trematodes Otodistomum cestoides van Beneden, 1871, Lecithaster micropsi Zdzitowiecki, 1992, Neolepidapedon trematomi Prudhoe et Bray, 1973, Postlepidapedon opisthobifurcatum Zdzitowiecki, 1990, Discoverytrema gibsoni Zdzitowiecki, 1990, D. markowskii Gibson, 1976, Macvicaria muraenolepidis Zdzitowiecki, 1990, Helicometra rakusai Zdzitowiecki, 1997 and Proctophantastes sp. are recorded from the Ross Sea for the first time. Proctophantastes sp. differs from other species of Proctophantastes Odhner, 1911 by the morphology of the ventral equatorial ridge of the ventral sucker.

The aim of the work is to study the leukocyte composition in blood of deep-water fish species by the example of Antarctic toothfish Dissostichus mawsoni. Fish were caught in January–February 2012 in the Ross Sea (Statistical Subarea 88.1) at depths from 690 to 1183 m from onboard “Yantar-31” longline fishing vessel. Blood samples were collected from the caudal artery of immature fish (10 specimens) with average mass 21.4 kg and length 114 cm. The composition of leukocytes in Antarctic toothfish is similar to the leukocyte composition in freshwater fish species except basophils (Ivanova, 1983; Golovina and Trombitskii, 1989). Lymphocytes constitute the main portion (84.8 ± 2.13%) in the leukocyte formula; eosinophils (6.0 ± 1.29%), neutrophils (4.8 ± 0.92%), blast cells (2.7 ± 0.42%) and monocytes (1.7 ± 0.33%) are less numerous. Among studied Antarctic species, Antarctic blackfin icefish Chaenocephalus aceratus (Barber et al., 1981) have a similar composition of leukocytes.