КамчатНИРО 88
years

Kamchatka Research Institute of Fisheries and Oceanography

Journal / Archives

УДК 597.553.2 DOI: 10.15853/2072-8212.2017.45.5-23Download the full article

To the issue of the use of asian pink salmon (Oncorhynchus gorbuscha, Walbaum) scale structure for identification in mixed marine catches 

Tatyana N. Naumova, Аlexander V. Bugaev. , Viktor S. I, Roman А. Shaporev, Vladimir А. Savin

Results of analysis of Asian pink salmon scale structure are demonstrated and estimation of the possible use of the structure as a differentiation marker in identification of mixed marine catches is made.

Five regional complexes of stocks are figured out on the base of the analysis of baselines collected in 2010, each having specific formation of sclerites in the first annual zone on the scale:

  1. of Japan (Hokkaido);
  2. of Sakhalin;
  3. Northern Kuril populations (Paramushir);
  4. of West Kamchatka;
  5. of East Kamchatka.

A complex of simulation tests is applied and results demonstrate quite high regional resolution ability of the model suggested (93,6% averaged). Identification is made for the samples from the drift net catches collected by RMV “Kadet-701” and SRTM-K “Leonid Khodyko” in June–August of 2010, and it is demonstrated that the results illustrate general commercial conjuncture in the year of the research. Correlations between coefficients of variation of the regional boot-stripe values and the number of sclerites used (in the zone of the 1st year) were analyzed. It is demonstrated that the model is stable when the number of the sclerites used is 11–15, and that allows regional identification of Asian juvenile pink salmon in marine catches possible.

mixed marine catches | stock identification | stock differentiation | regional complex of local stocks | sclerites | scale | pink salmon

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  .

Аlexandra. I. Chistyakova, Оlga О. Kim, Viktor S. I

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.

the Sea of Okhotsk | distribution | otolithe tagging | chum salmon | pink salmon