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.
Abstract:
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.
