scholarly journals Interannual Dynamics of Abundance of Pink and Chum Salmon Juveniles and their Average Body Size in the Sea of Okhotsk in 1998–2017

2018 ◽  
Keyword(s):  
Body Size ◽  
Sea Of Okhotsk ◽  
Chum Salmon ◽  
Dynamics Of Abundance ◽  
The Sea Of Okhotsk ◽  
Interannual Dynamics ◽  
Average Body

scholarly journals Trace element composition of the Southwestern Sakhalin Chum Salmon

2021 ◽  
Vol 937 (2) ◽  
pp. 022074
Author(s):  
A Litvinenko ◽  
N Khristoforova ◽  
V Tsygankov ◽  
M Kovalchuk
Keyword(s):  
Sea Of Japan ◽  
Sea Of Okhotsk ◽  
Chum Salmon ◽  
Trace Element Composition ◽  
Oncorhynchus Keta ◽  
The Sea Of Japan ◽  
The Sea Of Okhotsk ◽  
Lead And Cadmium ◽  
The Difference ◽  
The Impact

Abstract The study is devoted to the microelement composition of organs and tissues of chum salmon (Oncorhynchus keta), which came for spawning in September 2018 in the r. Lovetskaya on the southwestern coast of Sakhalin. Samples of organs and tissues of fish, prepared in Sakhalin, were frozen and delivered to Vladivostok for chemical analysis. Trace elements were determined from acid mineralizates by atomic absorption on a Shimadzu AA 6800. It was found that the content of microelements indicating anthropogenic impact on the environment (Zn, Cu and Ni) in the Sea of Japan chum was significantly higher than the content of those in the Okhotsk Sea fish. So, for example, the amount of zinc in the muscles of the Sea of Japan chum salmon was 2.5 times higher than in those of the Sea of Okhotsk fish. In the liver, the effect was even greater - the difference between the content of this element in the Sea of Japan and the Sea of Okhotsk reached 19 times. At the same time, in the organs and tissues of the Okhotsk chum salmon, which crossed the impact geochemical zone in the Kuril-Kamchatka region at least twice during its life cycle, the content of lead and cadmium, witnesses of underwater and surface volcanism in the Kuril straits, prevailed. The content of lead in the muscles of chum salmon from r. Raidovaya was 4 times more than in the muscles of chum salmon from the river. Lovetskaya; in the liver, the difference was 5 times.

Testing of the nest-incubator of chum salmon roe (Oncorhynchus keta W.) in small rivers of the Sakhalin region

Fisheries ◽  
2021 ◽  
Vol 2021 (5) ◽  
pp. 101-104
Author(s):  
Denis Efremov ◽  
Mikhail Skorobogatov ◽  
Aleksei Veselov
Keyword(s):  
Sea Of Okhotsk ◽  
Chum Salmon ◽  
Small Rivers ◽  
Oncorhynchus Keta ◽  
The Sea Of Okhotsk ◽  
Volume Method ◽  
To Receive

The result of an extra factory method of reproduction of a chum (Oncorhynchus keta) is presented. The method is tested in small tributaries river Mulka (bass. The Sea of Okhotsk, Strait of Tartary) and in Savushkin's river (bass. Sea of Okhotsk, Second Kuril passage). The original devices representing the flattened container in which in 6 tiers incubatory modules with flutes for caviar are placed are used. The nest allows to incubate during the winter the impregnated caviar of salmon species of fish and to receive the durable larvae which are independently settled in a threshold of the river or forcibly taken from devices in pools in the spring. The device has the increased capacity for the incubated caviar to 10000 berries of a chum on the device, the volume method of loading of caviar in the device is applied, time of equipment and installation of a nest to the river doesn't exceed 15 minutes. In general efficiency of hatching of larvae has made 96%. An exit of larvae has averaged 42,5%. At insignificant completion the device can be used for restoration of number of a chum and other salmon species of fish in the small rivers where factory reproduction is for various reasons unprofitable.

Long-term trends in distribution and regional composition of the catches of hatchery pink and chum salmon during autumn migrations in the basin of the Sea of Okhotsk

2021 ◽  
Vol 57 (57) ◽  
pp. 67-98
Author(s):  
A. V. Bugaev ◽  
A. I. Chistyakova ◽  
S. Urava
Keyword(s):  
Sea Of Okhotsk ◽  
Chum Salmon ◽  
Pink Salmon ◽  
The Sea Of Okhotsk ◽  
North East ◽  
The North ◽  
Intraspecific Structure ◽  
Juvenile Chum Salmon ◽  
Long Term Trends

Long-term trends in distribution and regional composition of the catches of hatchery pink and chum salmon during autumn post-catadromous migrations in the basin of the Sea of Okhotsk in 2011–2017 were evaluated based on the otolith marking data. Qualitative and intraspecific structure of the hatchery fish aggregations was analyzed in connection to the interannual variety in forming abundant and not abundant generations of pink salmon. The analyze is carried out allowed to find out that the aggregation density of Russian and Japan hatchery juvenile chum salmon in the eastern part of the Sea of Okhotsk is higher in the even years of observation. Along that the distribution of the active migrants of the Sakhalin-Kurile and Hokkaido stock complexes in the north-east direction withing the Okhotsk Sea basin is better expressed. We think, that the main reason is low abundance of pink salmon generations (odd years of spawning) on West Kamchatka during autumn migration in the even years.In general the results obtained indicate that the cyclic migration of juvenile pink and chum salmon in the basin of the Sea of Okhotsk during post-catadromous migrations is of a systemic and mass character. Hatchery and wild fish have been engaged. The scheme of the juvenile distribution is similar in even and odd years.

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