동해에 서식하는 대게류(Chionoecetes spp.)의 재생산 및 분포 특성
Reproduction and distribution of Chionoecetes crabs (C. opilio and C. japonicus) in the East Sea
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초록
Two Chionoecetes crabs, C. opilio and C. japonicus are primary targets of trap fisheries in the East Sea. To promotethe sustainable management of these species, we investigated their reproductive biology and spatial distributionbased on samples collected in standardized traps in the coastal waters of eastern Korea from September 2007 toAugust 2008. The estimated spawning season of C. opilio was March- April, whereas that of C. japonicus continuedyear-round. The estimated molting period of both species was September- October. Fecundity of C. opilio was proportionalto female, size, ranging from 44,791 to 151,538 eggs, and the estimated body size at 50% sexual maturitywas 63.9 mm carapace width. Egg bearing female C. opilio were mostly collected depths of 200-300 m, particularlyoff Hupo and Chuksan, suggesting that these areas are their major spawning grounds. In contrast, female C. japonicuswere mostly collected at depths of 400-600 m, peaking at 600 m. The species-specific catch rate was higher for C. opilio above 400 m, similar at ca. 450 m, and higher for C. japonicus below 500 m. These vertical differences indicateapparent spatial segregation of the species, suggesting that spatially-explicit fisheries management plans may benecessary for mitigating conflicts between the respective crab fisheries and maintaining these crabs.
Abstract
Two Chionoecetes crabs, C. opilio and C. japonicus are primary targets of trap fisheries in the East Sea. To promotethe sustainable management of these species, we investigated their reproductive biology and spatial distributionbased on samples collected in standardized traps in the coastal waters of eastern Korea from September 2007 toAugust 2008. The estimated spawning season of C. opilio was March- April, whereas that of C. japonicus continuedyear-round. The estimated molting period of both species was September- October. Fecundity of C. opilio was proportionalto female, size, ranging from 44,791 to 151,538 eggs, and the estimated body size at 50% sexual maturitywas 63.9 mm carapace width. Egg bearing female C. opilio were mostly collected depths of 200-300 m, particularlyoff Hupo and Chuksan, suggesting that these areas are their major spawning grounds. In contrast, female C. japonicuswere mostly collected at depths of 400-600 m, peaking at 600 m. The species-specific catch rate was higher for C. opilio above 400 m, similar at ca. 450 m, and higher for C. japonicus below 500 m. These vertical differences indicateapparent spatial segregation of the species, suggesting that spatially-explicit fisheries management plans may benecessary for mitigating conflicts between the respective crab fisheries and maintaining these crabs.
참고문헌 (28)
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