Some data about distribution of fry saffron cod Eleginus gracilis and walleye pollock Theragra chalcogramma on the west coast of Кamchatka and species composition in the catches of midwater trawl with a small-meshed insertion
https://doi.org/10.15853/2072-8212.2020.59.27-38
Abstract
Data of trawl surveys for the period 2010–2017 revealed distribution of fry saffron cod in vicinity of river outlets, while juvenile walleye pollock was dictributed either near the shore or over the deepwater area in the southern part of shelf. In 2017 aggregations of saffron cod individuals with the body length 29.4–70.5 mm (averaged 52.9 mm) were observed in the area between 52° and 53°N at the depth range 14–195 m. The aggregation densities were maximum at the plots of the highest salinity, temperature and turbidity of the water and higher chlorophyll-a concentration. Principal catches of juvenile walleye pollock were in the area between 53° and 54°N at the depth from 20 to 195 m (averaged 68.2 mm). The aggregation densities of juvenile walleye pollock were maximal at the plots of higher salinity and oxygen concentrations. The concentration of chlorophyll-a was mediate at these plots, comparing to values in the area observed. The body length of the fry varied from 44.5 to 74.6 mm (57.8 mm averaged). Besides juvenile saffron cod and walleye pollock, adult and juvenile individuals of 11 bottom and demersal-pelagic species were found in the catches of the midwater trawl.
About the Authors
O. V. Novikova
Kamchatka Branch of Russian Research Institute of Fisheries and Oceanography (“KamchatNIRO”)
Russian Federation
Russian Federation
Leading Scientist, Ph. D. (Biology)
683000 Petropavlovsk-Kamchatsky, Naberezhnaya, 18
Tel./fax: +7 (4152) 41-27-01, 42-19-88
A. V. Klimov
Kamchatka Branch of Russian Research Institute of Fisheries and Oceanography (“KamchatNIRO”)
Russian Federation
Russian Federation
Head of the Lab.
683000 Petropavlovsk-Kamchatsky, Naberezhnaya, 18
Tel./fax: +7 (4152) 41-27-01, 42-19-88
V. V. Kolomeytsev
Kamchatka Branch of Russian Research Institute of Fisheries and Oceanography (“KamchatNIRO”)
Russian Federation
Russian Federation
Researcher
683000 Petropavlovsk-Kamchatsky, Naberezhnaya, 18
Tel./fax: +7 (4152) 41-27-01, 42-19-88
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For citations:
Novikova O.V., Klimov A.V., Kolomeytsev V.V. Some data about distribution of fry saffron cod Eleginus gracilis and walleye pollock Theragra chalcogramma on the west coast of Кamchatka and species composition in the catches of midwater trawl with a small-meshed insertion. The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean. 2020;(59):27-38. (In Russ.) https://doi.org/10.15853/2072-8212.2020.59.27-38
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