Morphological differentiation of Amur fall Chum salmon juveniles Oncorhynchus keta (Salmonidae) of natural and hatchery origin

Mikheev, P. B.; Polygalova, M. D.; Pomelova, A. S.; Kostitsyna, N. V.; Podorozhniuk, E. V.

doi:10.36038/0234-2774-2022-23-4-221-229

jour

2022

DOI: 10.36038/0234-2774-2022-23-4-221-229

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Morphological differentiation of Amur fall Chum salmon juveniles Oncorhynchus keta (Salmonidae) of natural and hatchery origin

P. B. Mikheev¹,

M. D. Polygalova

A. S. Pomelova

et al.

Abstract: The results of a comparative analysis of the number of myotomes and fin rays in the dorsal and anal fins of Amur fall chum salmon fry of artificial and natural origin are presented. Juveniles of natural origin were distinguished by large values of the analyzed morphological features. The results can be used for the determination of juvenile chum salmon of natural and artificial origin at the intra-basin level for large tributaries of the Amur River.

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Тhe second Аmur complex ichthyological expedition – prerequisites and first results

Kotsyuk¹,

Kolpakov²

2022

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In 2018–2019 the second Amur ichthyological expedition has been prepared and is being conducted since 2020. The impetus for its organization was a sharp drop in the catches of Pacific salmons in the basin of the Amur River in 2017 and 2018, when after the maximum catch in 2016 (65,2 thousand tons), their catch decreased to 26,9 and 21,6 thousand tons, respectively. This required the adoption of urgent management decisions to preserve their reserves, as well as the expansion of the study of the Amur aquatic biological resources. The expedition has a complex character; the research covers the channel and accessory system of the middle and lower Amur, as well as Khanka Lake. Totally completed: about 5 thousand stations, more than 1,1 thousand hydrobiological samples were taken, about 40 thousand fish were subjected to bioanalysis. New data on the biology of Pacific salmon, smelts, freshwater and sturgeon fish species have been obtained and partially published (70 papers). A number of modern innovative research methods have also been introduced (the use of UAVs and GIS systems to account for Pacific salmon spawners, microchemical analysis of otoliths to assess the effectiveness of their artificial reproduction). The results obtained are of wide practical importance: they are used in the development of measures to regulate the fishing of various aquatic biological resources, including when amending the Fishing Rules.

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Тhe second Аmur complex ichthyological expedition – prerequisites and first results

Kotsyuk¹,

Kolpakov²

2022

jour

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To the history of pacific salmon research in the Khabarovsk branch of VNIRO

Kotsyuk,

Kolpakov

2024

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The article presents an overview of publications by the staff of the Khabarovsk branch of the State Scientific Center of the Russian Federation FGBNU VNIRO (KhabarovskNIRO) over the entire period of its existence (1945–2023) devoted to the study of Pacific salmon. Of the 1,5 thousand scientific papers, 450 (29,1%) were published on this group of fish. In the 1950–1980s and 2000–2010s, the works were dominated by studies on the population dynamics (27,1%) and biology of salmon (24,5%), their artificial reproduction (17,6%), biology, trophic links and food supply of their young (9,2%) (a total of 78,4% of works). In 2020–2023, against the backdrop of a sharp decline in the number of Pacific salmon in the Amur River basin, within the framework of the Second Amur Ichthyological Expedition, the main efforts to study them were focused on studying fisheries and developing measures to regulate it (24,4%), methodological developments (24,4%), biology research (17,8%), modeling population dynamics (15,6%) and surveying spawning grounds, assessing the number of spawned producers (11,1%). It is concluded that further progress in developing a deeper understanding of the biology of Pacific salmon and the mechanisms of their abundance, as well as developing effective measures to regulate the fishery, will be facilitated by creating a database based on GIS technologies using both archival data and large-scale materials on salmon obtained in recent years as part of innovative scientific research using AI, GIS, UAVs, and the NetCor-3 hydroacoustic complex. In addition, it is necessary to involve in the analysis the extensive data of the Second Amur Ichthyological Expedition on zooplankton, benthos, other fish, the overall productivity of the Amur basin ecosystem, and the dynamics of its hydrological regime. Such an integrated approach will increase the number of analytical works and, in particular, prepare a summary of the Amur salmon based on the results of the expedition.

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Morphological differentiation of Amur fall Chum salmon juveniles Oncorhynchus keta (Salmonidae) of natural and hatchery origin

Cited by 2 publications

References 11 publications

Тhe second Аmur complex ichthyological expedition – prerequisites and first results

Тhe second Аmur complex ichthyological expedition – prerequisites and first results

To the history of pacific salmon research in the Khabarovsk branch of VNIRO

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