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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 1993.8
- 수록면
- 133 - 146 (14page)
이용수
초록· 키워드
오류제보하기
Monthly variation of fatness index of the shortnecked clam was investigated at Moonhangri in Namhaedo of the southern coast of Korea from April 1991 to March 1992. The standing crops of umbo stage larvae and spats of this bivalve were also investigated. The results are as follows :
The ranges of a monthly average water temperature and salinity were 6.9~23.5℃ and 29.6~33.1‰ during the investigation period. Fatness index of the shortnecked clam decreased suddenly from June to September, which seemed to be spawning season. The umbo stage larvae of the clam were observed from May to November. The standing crops of the larvae were 883 inds./m³in August and 68 inds./m³in November.
The observed number per of the spats varied with the month and the different exposure time zones. The highest density (1,508 inds./㎡) was observed 1 hour exposure zone in August, and the lowest one (28 inds./㎡) at 1 hour exposure station in April. Even the observed number of the spats below 4 mm in shell length were high in 1 and 3 hour exposure zones, the spats above 4 mm in shell length were observed mainly at 3 hour exposure zone.
The ranges of a monthly average water temperature and salinity were 6.9~23.5℃ and 29.6~33.1‰ during the investigation period. Fatness index of the shortnecked clam decreased suddenly from June to September, which seemed to be spawning season. The umbo stage larvae of the clam were observed from May to November. The standing crops of the larvae were 883 inds./m³in August and 68 inds./m³in November.
The observed number per of the spats varied with the month and the different exposure time zones. The highest density (1,508 inds./㎡) was observed 1 hour exposure zone in August, and the lowest one (28 inds./㎡) at 1 hour exposure station in April. Even the observed number of the spats below 4 mm in shell length were high in 1 and 3 hour exposure zones, the spats above 4 mm in shell length were observed mainly at 3 hour exposure zone.
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