駿河湾深層水を用いたサガラメEisenia arboreaの0.1-1kL水槽規模での培養(Culture of sporophytes of Sagarame Eisenia arborea in 0.1-1 kL tanks by using deep seawater from Suruga Bay)
- 標題
- 駿河湾深層水を用いたサガラメEisenia arboreaの0.1-1kL水槽規模での培養(Culture of sporophytes of Sagarame Eisenia arborea in 0.1-1 kL tanks by using deep seawater from Suruga Bay)
- 作者
- 野田 浩之, 二村 和視, 岡本 一利(Hiroyuki NODA, Kazumi NIMURA, Kazutoshi OKAMOTO)
- 文件屬性
- 日本研究
- 知識分類
- 基礎研究
- 出版年
- 2010
- 刊名
- 海洋深層水研究
- 卷
- 11
- 期
- 1
- 頁
- P 13-19
- 點閱數
- 2528
摘要
駿河湾深層水を用いたサガラメEisenia arboreaの陸上養殖技術の開発を目的に, 駿河湾深層水をかけ流し, 通気によって胞子体を浮遊させた状態で0.1-1kL規模の水槽を用いた培養を試み, 培養密度と生長率の関係について調べた. 材料にはフリー配偶体から生産したサガラメ胞子体を用い, 開始時の葉長 (19～50mm) 及び培養密度 (1.65～4.80kg/kL) の異なる5試験区を設定した. 自然光の差し込む屋内で容量0.1kLから1kLの水槽を用い28～48日間培養した. いずれの試験区も培養期間の経過に伴い葉長と湿重量が増加し, 培養終了時には開始時から3.55～7.62kg増重した. 日積算光量の平均値が同様の2期間において, 培養密度と葉長および湿重量の各相対生長率の関係を検討した結果, 負の相関が認められた. 以上のことから, 駿河湾深層水を用いた浮遊培養によるサガラメの養殖は可能であり, 培養密度を2kg/kL以下に保つことで高い生長率を維持できると考えられた.
We attempted to develop a tank culture method for growing Sagarame Eisenia arborea by using deep seawater from Suruga Bay; For this purpose, we employed the mass-culture method using free-living sporophytes. Five experimental setups were created in the laboratory; the sporophytes were cultured at various cultivation densities (1.65-4.80 kg/kL) and had leaves of various blade lengths (19-50 mm). They were grown in polycarbonate tanks of 0.1 kL, 0.5 kL and 1 kL volume under natural daylight conditions for 28-48 days. Blade lengths and wet weights of all the culture samples under different setups were found to have increased, and the wet weights of cultures in each setup increased by 3.55-7.62 kg. Cultivation densities and the relative growth rates in blade lengths or wet weights showed negative linear correlations (blade length: y=-0.40x+3.81, r=0.64, p<0.05; wet weight: y=-0.73x+9.66, r=0.79, p<0.01) under same daily light quantity level. On the basis of these results, we think that tank culture of this kelp species with a high growth rate is possible if it is cultured at the density of 2 kg/kL or less.
We attempted to develop a tank culture method for growing Sagarame Eisenia arborea by using deep seawater from Suruga Bay; For this purpose, we employed the mass-culture method using free-living sporophytes. Five experimental setups were created in the laboratory; the sporophytes were cultured at various cultivation densities (1.65-4.80 kg/kL) and had leaves of various blade lengths (19-50 mm). They were grown in polycarbonate tanks of 0.1 kL, 0.5 kL and 1 kL volume under natural daylight conditions for 28-48 days. Blade lengths and wet weights of all the culture samples under different setups were found to have increased, and the wet weights of cultures in each setup increased by 3.55-7.62 kg. Cultivation densities and the relative growth rates in blade lengths or wet weights showed negative linear correlations (blade length: y=-0.40x+3.81, r=0.64, p<0.05; wet weight: y=-0.73x+9.66, r=0.79, p<0.01) under same daily light quantity level. On the basis of these results, we think that tank culture of this kelp species with a high growth rate is possible if it is cultured at the density of 2 kg/kL or less.