지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 1993.11
- 수록면
- 235 - 253 (19page)
이용수
초록· 키워드
오류제보하기
The freshwater crab, Eriocheir japonicus inhabits from sub-tropical to temperate zone in Asia. This species belongs to a large size group among freshwater crabs. Common size of this crab is 5~6 cm in carapace length and occasionally 7 cm in carapace length.
This species of crab used to inhabit in estuaries, rivers and inland waters in Korea. However, natural population recently has been rapidly decreased because of pollution and lost their habitats by suburban development. Therefore, development of proper methods of seedling production to increase natural stock became necessity. As parts of achieving this goal, duration from mating to spawning, egg incubation period, and egg development of this species were studied. The influence of temperatures and salinities on the egg incubation and hatching was also investigated.
It took 2~8 hours from mating to egg spawning and the spawning lasted 3~9 hours from the first spawning. Egg numbers per female (6 cm in carapace length) were 380,000~410,000. Optimum temperature for egg incubation was 17~23℃ and optimum salinity, 14.0~31.5‰.
Incubation period of the eggs at 14℃, 17℃, 20℃, 26℃, and 28℃ was 42, 28, 21, 15, and 14 days, respectively. Relation between temperature (X) and incubation days (Y) was Log Y= Log 2764.267-1.608 Log X. A female can spawn 4~6 times per year by manipulation of environmental conditions.
Under the conditions of 18℃ and 24.5‰, it took 6 days up to embryo formation, 18 days up to compound eye formation, 22 days up to abdominal movement, and 25 days up to hatch out as zoea larvae.
This species of crab used to inhabit in estuaries, rivers and inland waters in Korea. However, natural population recently has been rapidly decreased because of pollution and lost their habitats by suburban development. Therefore, development of proper methods of seedling production to increase natural stock became necessity. As parts of achieving this goal, duration from mating to spawning, egg incubation period, and egg development of this species were studied. The influence of temperatures and salinities on the egg incubation and hatching was also investigated.
It took 2~8 hours from mating to egg spawning and the spawning lasted 3~9 hours from the first spawning. Egg numbers per female (6 cm in carapace length) were 380,000~410,000. Optimum temperature for egg incubation was 17~23℃ and optimum salinity, 14.0~31.5‰.
Incubation period of the eggs at 14℃, 17℃, 20℃, 26℃, and 28℃ was 42, 28, 21, 15, and 14 days, respectively. Relation between temperature (X) and incubation days (Y) was Log Y= Log 2764.267-1.608 Log X. A female can spawn 4~6 times per year by manipulation of environmental conditions.
Under the conditions of 18℃ and 24.5‰, it took 6 days up to embryo formation, 18 days up to compound eye formation, 22 days up to abdominal movement, and 25 days up to hatch out as zoea larvae.
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