成体サクラエビScrgia lucensの生残, 成長におよぼす海洋深層水の影響(Comparison of survival and growth in adult pelagic shrimp Sergia lucens between deep and surface seawater cultures)
- 標題
- 成体サクラエビScrgia lucensの生残, 成長におよぼす海洋深層水の影響(Comparison of survival and growth in adult pelagic shrimp Sergia lucens between deep and surface seawater cultures)
- 作者
- 岡本 一利(Kazutoshi Okamoto)
- 文件屬性
- 日本研究
- 知識分類
- 水產養殖
- 出版年
- 2006
- 刊名
- 海洋深層水研究
- 卷
- 7
- 期
- 1
- 頁
- P 1-7
- 點閱數
- 2389
摘要
駿河湾で採取した成体サクラエビを, 海洋深層水と表層水の2実験区に分け, 水温は約15℃, 餌料はアルテミアノープリウスを給餌することにより個別飼育した.海洋深層水区, 表層水区の実験結果は次のとおりであった.最大生残日数は各々185, 17日, 平均生残日数は各々58.8, 13.0日, 1個体あたりの最高脱皮回数は各々15, 1回, 平均脱皮回数は3.4, 0.2回であり, 海洋深層水区で生残日数が長く, 脱皮回数が増加した.海洋深層水区において, 飼育開始から最初の脱皮までの平均日数は15.8日, それ以降の平均脱皮間隔日数は12.0日で規則的に脱皮を繰り返した.脱皮前甲長 (x) と脱皮後甲長 (y) の関係を求めた結果, y=0.7156x+2.71 (r=0.80, n=31, p<0.001), の式で表された.飼育実験値と野外調査による成長推定値が類似した.海洋深層水を利用することによりサクラエビの生態解明が期待される.
Pelagic shrimp, Sergia lucens, is an important commercial species of which fisheries are endemic to Suruga Bay. Although the wild shrimp are known to live for about 15 months, adults survived at most one month in previous culture studies. Therefore we challenged to keep the adult shrimp longer in the laboratory by using clean and cold deep-sea water (DSW) pipelined from a depth of 687 m in Suruga Bay in 2004. In the present paper, growth and survival of wild shrimps (nine or ten individuals of 10.15-11.69 mm in carapace length (CL)) were compared between two culture media, DSW and surface seawater (SSW, pipelined from a depth of 24 m). The shrimps were fed Artemia nauplii and kept individually in 1 liter beakers controlled at about 15°C. As the result, the average periods of survival were 58.8 days in DSW and 13.0 days in SSW. At the longest case, an adult could survive for 185 days in DSW. Even after 17 days, when no shrimps survived in SSW, 44.4 % of shrimps survived in DSW. The average (maximum) frequencies of molts per individual were 3.4 (15) times in DSW and 0.2 (1) times in SSW, respectively. The average period from start of rearing to the first molt was 15.8 days, and the average intermolt period was 12.0 days in DSW. The relationship between premolt and postmolt CLs could be described by the equation, y = 0.7156x + 2.71 (r = 0.80, n = 31, p< 0.001). The growth rate obtained in the laboratory was similar to that estimated from wild stock in the previous study. As shown in the present paper, DSW is a good tool for the long-term culture of adult shrimp, which may ensure the increase in ecological information of this shrimp.
Pelagic shrimp, Sergia lucens, is an important commercial species of which fisheries are endemic to Suruga Bay. Although the wild shrimp are known to live for about 15 months, adults survived at most one month in previous culture studies. Therefore we challenged to keep the adult shrimp longer in the laboratory by using clean and cold deep-sea water (DSW) pipelined from a depth of 687 m in Suruga Bay in 2004. In the present paper, growth and survival of wild shrimps (nine or ten individuals of 10.15-11.69 mm in carapace length (CL)) were compared between two culture media, DSW and surface seawater (SSW, pipelined from a depth of 24 m). The shrimps were fed Artemia nauplii and kept individually in 1 liter beakers controlled at about 15°C. As the result, the average periods of survival were 58.8 days in DSW and 13.0 days in SSW. At the longest case, an adult could survive for 185 days in DSW. Even after 17 days, when no shrimps survived in SSW, 44.4 % of shrimps survived in DSW. The average (maximum) frequencies of molts per individual were 3.4 (15) times in DSW and 0.2 (1) times in SSW, respectively. The average period from start of rearing to the first molt was 15.8 days, and the average intermolt period was 12.0 days in DSW. The relationship between premolt and postmolt CLs could be described by the equation, y = 0.7156x + 2.71 (r = 0.80, n = 31, p< 0.001). The growth rate obtained in the laboratory was similar to that estimated from wild stock in the previous study. As shown in the present paper, DSW is a good tool for the long-term culture of adult shrimp, which may ensure the increase in ecological information of this shrimp.