Investigations of Local Group of Red King Crab in the Coastal Barents Sea in Summer 2011
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Abstract
The object of our study is the red king crab Paralithodes camtschaticus, a species which was introduced into the Barents Sea to increase resource potential of this aquatic area. During the studies undertaken in Dalnezelenetskaya Bay we investigated size and sex composition of the local red king crab group, we took data on the occurrence of molting stages among red king crabs. Additionally we recorded data about egg conditions in females and percentage occurrence of limb injuries in red king crabs. Large mature crabs with carapace width > 100 mm prevailed in scuba diving catches. Among these animals females dominated in terms of total number that was 15 times higher than the level registered for male crabs. Females with violet eggs predominated among all egg-bearing females. Two barren females were caught, their presence indicate unfavorable reproductive status of the local red king crab group. Total limb injury level was estimated to be 52%; this level was lower than the multiannual mean value owing to lower abundance of juveniles which are more susceptible to limb injury through predator attacks. Total red king crab abundance was 5960 individuals. Significant decreasing in this value in comparison to 2010 was associated with abnormally low water temperatures observed in the coastal waters in winter 2010.
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References
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