駿河湾深層水中で培養したカジメEcklonia cava (Phaeophyceae) 幼体の生長表層海水との比較および光量・水温の影響(Growth of juvenile Ecklonia cava(Phaeophyceae) sporophytes cultured in pumped Suruga Bay deep-sea water comparison with surface seawater culture and effects of irradiance and water temperature)
- 標題
- 駿河湾深層水中で培養したカジメEcklonia cava (Phaeophyceae) 幼体の生長表層海水との比較および光量・水温の影響(Growth of juvenile Ecklonia cava(Phaeophyceae) sporophytes cultured in pumped Suruga Bay deep-sea water comparison with surface seawater culture and effects of irradiance and water temperature)
- 作者
- 二村 和視, 岡本 一利, 高瀬 進(Kazumi Nimura, Kazutoshi Okamoto and Susumu Takase)
- 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 9-15
- 點閱數
- 2428
摘要
カジメ幼体の生長に及ぼす駿河湾深層水, 光量, 水温の影響について調べた.深層水区で培養した幼体の介在生長速度は2.9±0.4mmday-1であり, 表層海水区での生長速度2.4±0.5mmday-1に比べて1.2倍高かった.高光量区 (1.0Em-2 day-1) での介在生長速度は3.0±0.6mmday-1であり, 低光量区 (0.3Em-2day-1) での生長速度 (1.0±0.1mmday-1) に比べて高かった.また, 低・中水温区での介在生長速度は1.8±0.3mmday-1であり, 高水温区での1.5±0.5mmday-1に比べて1.2倍高かった.茎状部の生長については, 試験IIでの高光量区および試験IIIの低・中水温区において高い生長を示したが, 試験Iにおいて深層水と表層海水での生長の差はなかった.このように幼体の生長速度が速いことから, 駿河湾深層水は培養海水として利用価値が高く, また深層水を培養海水とする際には光量約1Em-2day-1, 水温13～16℃が適していた.
JuvenileEcklonia cavasporophytes were cultured in indoor tanks with flowing deep-sea water(DSW, known as clean, cold and nutrient-rich)pipelined from a depth of 397 m in Suruga Bay, central Pacific Coast of Japan, in 2004 to determine the best growth condition for its seed production. In the experiment I(April 26thto June 6th), growth was compared be-tween the deep-sea water and surface seawater(SSW)pipelined from a depth of 24 m at a temperature around 18°C. As a result, blade elongation in DSW was 2.9±0.4 mm day-1, which was 1.2 times higher than that in SSW(2.4±0.5 mm day-1). Therefore, the latter two experiments were merely conducted in DSW. In experiment II(May 10thto June 6th), in which growth was compared between two levels of irradiance(0.3 and 1.0 Em-2day-1)conditioned with and without a cover above the tanks, blade elongation in high irradiance(3.0±0.6 mm day-1)was 3 times higher than that in low irradiance(1.0±0.1 mm day-1). In Experiment III(June 29thto July 26th), growth was compared among three levels of water temperature(13, 16 and 20°C)conditioned by changing the mixing rate of ambient and heated DSW. Blade elongation at low and mid water temperatures(1.8±0.3 mm day-1)was 1.2 times higher than that at high water temperature(1.5±0.5 mm day-1). In stipe elongation, higher growth rates were obtained in high irradiance in Exp. II and low and mid water temperatures in Exp. III, while no difference was found between DSW and SSW in Exp. I. These results indicate that Suruga Bay deep-sea water is useful as a medium for culturing juvenileE. cavaand that optimal culture conditions were 1 E m-2day-1and 13-16°C.
JuvenileEcklonia cavasporophytes were cultured in indoor tanks with flowing deep-sea water(DSW, known as clean, cold and nutrient-rich)pipelined from a depth of 397 m in Suruga Bay, central Pacific Coast of Japan, in 2004 to determine the best growth condition for its seed production. In the experiment I(April 26thto June 6th), growth was compared be-tween the deep-sea water and surface seawater(SSW)pipelined from a depth of 24 m at a temperature around 18°C. As a result, blade elongation in DSW was 2.9±0.4 mm day-1, which was 1.2 times higher than that in SSW(2.4±0.5 mm day-1). Therefore, the latter two experiments were merely conducted in DSW. In experiment II(May 10thto June 6th), in which growth was compared between two levels of irradiance(0.3 and 1.0 Em-2day-1)conditioned with and without a cover above the tanks, blade elongation in high irradiance(3.0±0.6 mm day-1)was 3 times higher than that in low irradiance(1.0±0.1 mm day-1). In Experiment III(June 29thto July 26th), growth was compared among three levels of water temperature(13, 16 and 20°C)conditioned by changing the mixing rate of ambient and heated DSW. Blade elongation at low and mid water temperatures(1.8±0.3 mm day-1)was 1.2 times higher than that at high water temperature(1.5±0.5 mm day-1). In stipe elongation, higher growth rates were obtained in high irradiance in Exp. II and low and mid water temperatures in Exp. III, while no difference was found between DSW and SSW in Exp. I. These results indicate that Suruga Bay deep-sea water is useful as a medium for culturing juvenileE. cavaand that optimal culture conditions were 1 E m-2day-1and 13-16°C.