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Poltev Y.N.,Sakhalin Research Institute of Fisheries and Oceanography
Russian Journal of Marine Biology | Year: 2010

During a study performed in April 2008 in the Pacific waters of the northern Kuril Islands, the parasitic copepod Haemobaphes diceraus was found localized on the isthmus of two specimens of the walleye pollock Theragra chalcogramma. In both cases, the parasite directly penetrated the heart, without entering the blood vessels. © Pleiades Publishing, Ltd., 2010.

Material was collected in 1997-1999, 2002, and 2006 at the eastern coast of the northern Kuril Islands and at the southeastern extremity of Kamchatka. The prevalence of infection by the parasitic copepod Haemobaphes diceraus in the cod Gadus macrocephalus during the study period averaged 22.2%. The intensity of H. diceraus infection was up to 6 ind/fish, and it increased with decrease in the average and greatest body length of the cod. With increase in fish body length, the role of the fourth branchial arch as the attachment site of the parasite decreased and the importance of the second branchial arch increased. Pacific cod mainly become infected by H. diceraus at depths of 101-150 m. A sharp increase in the occurrence of chitinized remains of this parasite occurred in fish starting with the 41-45 cm size group. The death rate of infected cod up to 40 cm long was 14.3%. © 2010 Pleiades Publishing, Ltd.

Labay V.S.,Sakhalin Research Institute of Fisheries and Oceanography
Zoologicheskii Zhurnal | Year: 2013

A detailed description of the amphipod Protomedeia chelata Kudrjaschov 1965 from the Sea of Okhotsk shelf at northeastern Sakhalin is given. The description of males is essentially expanded. The description of P. chelata females is given for the first time; male of P. chelata is described in more detail.

Kaev A.M.,Sakhalin Research Institute of Fisheries and Oceanography
Journal of Ichthyology | Year: 2015

Results of study of scale structure of 17 generations of pink salmon Oncorhynchus gorbuscha from the southeastern coast of Sakhalin (return in 1994–2001, 2005–2013) are presented. The absence of statistically significant correlation between the number of sclerites on scale and duration of staying of fish of separate generations in seawaters and body length was established. Values of intersclerite distances on scales positively correlate with fish length, which allows the use of this index for characteristic of pink salmon growth. At calculation of the rate of growth of fish, fry length at the moment of formation of central scale plate was introduced into the formula. It was found that interannual variation of scleritograms of the first annual zone of the growth of scales by its magnitude is comparable to regional. Specific features of growth of pink salmon to a greater extent are apparently determined by temperature conditions rather than the level of development of its food resources. Survival of generations of pink salmon during marine period of life positively correlates with the rate of growth of fingerlings, which can be used in prognostic purposes. © 2015, Pleiades Publishing, Ltd.

Sokolov S.G.,RAS A.N. Severtsov Institute of Ecology and Evolution | Frolov E.V.,Sakhalin Research Institute of Fisheries and Oceanography
Zoologicheskii Zhurnal | Year: 2012

Parasites of the Amur sleeper from Sladkoe Lake located in the northwestern part of Sakhalin Island are described for the first time. A total of 24 species and unidentified forms of parasites were recorded; 11 species (forms) were described as new ones. More than half of the parasites were found in 1-2 individuals. Rhaphidascaris acus juveniles and Apatemon gracilis metacercariae were the most abundant parasites in rotans. Probably, the predominance of these species is caused by their accumulation in the host. Shannon, Brillouin and Berger-Parker indexes, which characterize the α-diversity of Amur sleeper's parasites in Sladkoe Lake, were determined. The data on the parasite fauna of Amur sleeper within its native range were obtained for the first time. Sixty-seven parasite species and unidentified forms were recorded. For 13 parasites species, Amur sleeper is the only or one of the not numerous obligate hosts. Trematoda was found to be the most numerous taxonomic group (31.3% species). Parasites are listed with notes on their location and references.

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