Spatial distribution and functional structure of the snow crab area in the Northern part of the Okhotsk Sea
https://doi.org/10.36038/2307-3497-2018-172-27-48
Abstract
Based on the materials of two trawl surveys (1997 and 2000), two trap surveys (1992 and 2001) and 153 fishing trips (1992–2007), the distribution of snow crab Chionoecetes opilio in the northern part of the Okhotsk Sea was analyzed. A functional structure of the snow crab area was compiled on materials of distribution of size and gender groups supplemented by literature data. The center of the structure is reproduction zone — dense accumulations of females with eggs deposited on pleopods or already released larvae, located near the edge of the shelf. The pelagic larvae settled down in the upper part of the shelf, the zone at depths of up to 100 m, where the fry grows up to 2 years, after which they descend deeper into the zone of non-migrating juveniles. In this zone the crabs become mature and start ontogenetic migration towards the reproductive zone. During the migration the females pass terminal molt, mate and come in the reproductive zone with laying on pleopods eggs. Females live up to 6 years after terminal molt. Terminal molt of males occurs gradually, in small portions of total males. Over molted males slow down and stop migration. During the period from maturity to terminal molt, several molts of growth can pass. As a result, some males after the terminal molt remain in the zone of migration, part in the reproductive zone, part follow the feeding zone of commercial males, where the terminal molt occurs. This zone is the main fishing area. These males return to the reproductive zone shortly before death, 3–4 years after the terminal molting. This structure reduces the negative role of cannibalism in the early stages of development.
About the Authors
A. N. KarasevRussian Federation
Novokuznetsk
M. G. Karpinsky
Russian Federation
Moscow
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Review
For citations:
Karasev A.N., Karpinsky M.G. Spatial distribution and functional structure of the snow crab area in the Northern part of the Okhotsk Sea. Trudy VNIRO. 2018;172:27-48. (In Russ.) https://doi.org/10.36038/2307-3497-2018-172-27-48