Archives / Volume 48
УДК 575.174.015.3DOI: 10.15853/2072-8212.2018.48.5-18Download the full article
Differentiation of walleye pollock (Theragra chalcogramma)of the Sea of Okhotsk based on the microsatellite loci
Results of examination of the variety of 10 microsatellite loci (Gmo34, Gmo35, PGmo32, Gmo3, Gmа102, Gmа106, Gmа108, Gmo-G18, Gmo-С83, Gmo-С86) in samples of walleye pollock from the Sea of Okhotsk are represented in the article. It is demonstrated, that the best differentiators in case of walleye pollock in the Sea of Okhotsk are the loci Gmo-C86 and Gma106. A high level of individual genetic variety within examined samples is revealed. The clusters of the samples are of random nature. It has not found correlation between quantitative values of genetic differences of Fst samples and geographic distances between sampling locations. The hypothesis that there are separate populations in spawning districts was not confirmed on results of the research.
УДК 597.552.51:639.32(265)DOI: 10.15853/2072-8212.2018.48.19-30Download the full article
Current state of the health of pacific salmon (Oncorhynchus) in the aquaculture of Kamchatka
Results of complex virological, bacteriological, parasitological and histological examination of juvenile and mature Pacific salmon from hatcheries of Kamchatka in 2015–2017 are demonstrated. The most dangerous pathogens for salmon included the Infectious Hematopoietic Necrosis Virus (IHNV) and bacteria Aeromonas salmonicida subsp. salmonicida, the causative agent of furunculosis. An asymptomatic carriage of IHNV was revealed in mature sockeye salmon (O. nerka) from two hatcheries and chum salmon (O. keta) in one hatchery. An outbreak of the IHNwas recorded among juvenile sockeye salmon at one of hatcheries in 2017. For the research period A. salmonicidawas found at four hatcheries in sockeye salmon, coho salmon (O. kisutch) and chum salmon used for reproduction. Histopathological changes typical as chronic form of alimentary toxicosis were the most frequent in liver, kidneys and gastrointestinal tract of juvenile individuals. Serious structural changes of the organs and tissues as a result of water or alimentary toxicosis were revealed in coho salmon underyearlings in 2017.
УДК 591.69-7(597.553.2) DOI: 10.15853/2072-8212.2018.48.31-42Download the full article
Parasites of Salmonidae in the Аzabachye Lake (Kamchatka), dangerous for human health or affecting quality and commercial value of fish
Myxosporidia Henneguya zschokkei(Gurley, 1894) and Myxobolus dermatobius Achmerov, 1960, cestodes Diphyllobothrium dendriticum (Nitzsch, 1824) and D. ditremum (Greplin, 1825), nematodes Anisakis simplex (Rud., 1809) and Philonema oncorhynchi Kuitunen Ekbaum, 1933, copepods Salmincola spp. and lampreys Lethenteron spp. were found in resident and migratory salmonid fish of Azabachye Lake basin. These parasites can be dangerous to human health or can lower quality and commercial value of fish.
УДК 574.3(265.53)639.222.03DOI: 10.15853/2072-8212.2018.48.43-51Download the full article
Productivity and biomass dynamics of pacific hering Clupea pallasii of Tauyskaya Bay in the population structure of the species in the Sea of Okhotsk
Biomass dynamics and formation of somatic production of the Tauyskaya Bay herring population and the other populations of this species in the Sea of Okhotsk and adjacent waters were studied on the base of author’s own materials and literature data. It was found, that depending on the features of the body weight growth rates and natural decline with ages, there can be differences between herring populations, illustrated by asymmetry of the biomass dynamics parabolic curves, characterizing different biomass growth or reduction rates. In this parameter the Tauyskaya Bay herring population is close to the Gizhiga-Kamchatka’s population, and both represent large population cluster of herring on the southeast of Kamchatka. All these populations are characterized by comparatively slow increase of the biomass with ages and late culmination of the biomass. On the contrary, the Okhotsk population of the species, it being close to the Tauysk herring population in geographical sense, is more similar with the population of the De Castries Bay. Both demonstrate similarity with the population cluster of Eastern Sakhalin. On the productivity index (Р/В-factor), the Tauyskaya Bay herring population is minor comparing to the Gizhiga-Kamchatkan or Okhotsk populations, what can be due to historically small area occupied, limited from the east and west by distribution of mentioned large populations.
УДК 595.384.2 DOI: 10.15853/2072-8212.2018.48.52-61Download the full article
Size-age structure of rock sole Lepidopsetta polyxystra near Southeast Kamchatka in 2003–2016
Size-age composition in the catches of different fishing gears and seasonal and interannual dynamics of rock sole was examined based on materials collected in 2003 and 2005–2016 on the shelf of Southeast Kamchatka in order to provide analysis and characterization for mentioned period. It was found during the work, that the size composition of rock sole was similar in the catches of different fishing gears and in different gulfs of Southeast Kamchatka. That creates possibility to use united data to analyze sspecifics of ize-age composition dynamics in the periods of different intensity of fishery, and in math models to estimate stocks of commercial fish species.
УДК 597.553.2-154.343 DOI: 10.15853/2072-8212.2018.48.62-69Download the full article
Assessment of regional origin and distribution of hatchery pink and chum salmon on results of otolith marking in the basin of the Sea of Okhotsk in the fall period of 2016 .
Otolith structures of juvenile pink and chum salmon from trawl catches of complex surveys provided in October–November of 2016 by R/V “Professor Kaganovsky” were examined. The otolith samples for the analysis were collected from 600 pink salmon individuals and 1150 individuals of chum salmon. Obtained results allow to identify hatchery marked fish in mized catches. In the total there were 15 (2.5%) pink and 50 (4.3%) chum salmon individuals revealed with otolith marks of different salmon hatcheries (SHs) of Russian Far East and Japan. Structure of hatchery juvenile release in the Sea of Okhotsk basin was analyzed. The highest number of juvenile pink and chum salmon was released from the Shs of Sakhalin, and the leader in the release of marked juvenile pink was Sakhalin cluster of the hatcheries, and of chum salmon – the cluster of Japan. It was figured out based on the analysis of the otoliths of juvenile pink salmon from the Sea of Okhotsk, that the percental contribution of fish from different regions into the catches is generally fits structure of the release of marked juvenile pink salmon from the SHs of Russian Far East and Japan. In the ratio between marked Russian and Japan juvenile chum salmon in the Sea of Okhotsk juvenile aggregations the part of Russian hatcheries was first time ever higher than the part of the hatcheries of Japan, what can indirectly evidence in favour of increasing survival of marked fish from Russian SHs and better quality of the marks.
It was figured out during analysis of the distribution of marked juvenile pink salmon in the west part of the Sea of Okhotsk, that the sites of the catches of marked pink in most cases coinsided with the sites of increased density of pink salmon underyearlings. Analysis of distribution of marked juvenile chum salmon in the waters of the sea has revealed that in 2016 there was rather obvious spatial dissociation between feeding juvenile salmon from Russian and Japan SHs.
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