高知県海洋深層水研究所の養殖施設から採集した付着珪藻(Attached diatoms occurring in the aquaculture facility in Kochi Prefectural Deep Seawater Laboratory)
- 標題
- 高知県海洋深層水研究所の養殖施設から採集した付着珪藻(Attached diatoms occurring in the aquaculture facility in Kochi Prefectural Deep Seawater Laboratory)
- 作者
- 鈴木 秀和, 阿部 祐子, 藤田 大介, 南雲 保(Hidekazu SUZUKI, Yuko ABE, Daisuke FUJITA, Tamotsu NAGUMO)
- 文件屬性
- 日本研究
- 知識分類
- 水產養殖
- 出版年
- 2007
- 刊名
- 海洋深層水研究
- 卷
- 8
- 期
- 1
- 頁
- P 27-37
- 點閱數
- 2729
摘要
高知県海洋深層水研究所内の養殖施設 (水温10～16℃) の6水槽9試料に出現した付着珪藻を光学顕微鏡で調べ, 21属37種の出現を確かめた.主要種は, Navicula agnita, Craspedostaurosdecipiens, Nitzschia laevis, Gomphoseptatum aestuarii, Diploneis papula, Tabularia fasciculataおよびT. investiensで, このうちC. decipiens, G. aestuarii およびD. Papulaは少なくとも1試料で相対頻度の最高ランク (>50%) を示した. 低温 (10℃ 以下) の海洋深層水 (DSW) が利用されている富山県内の2養殖施設で報告された種も確認された. DSWを40日間かけ流しただけの覆い付き屋外水槽では4種しか出現せず, DSWの清浄性が確かめられた. アワビ養殖の3 (屋外2, 屋外1) 水槽には12-24種が出現し, 特に表層海水を混ぜた屋内水槽で種数が最も多かった.屋外コンブ水槽から8, 屋内エビ水槽から4種が出現した.以上, 生物 (特にアワビ) の飼育や表層海水の混入がDSW中の付着珪藻の種数を増やし, 相対頻度の高い種はDSWでの培養有望種として期待できると結論した.
The attached diatom flora in the aquaculture facility, Kochi Prefectural Deep Seawater Laboratory, Muroto, Japan, in which Pacific deep seawaters (DSW) were pipelined from depths of 320 m and 341 m, was studied using light microscopy. A total of 37 species in 21 genera were recorded from the tanks (10-16°C). The popular identified species were Navicula agnita, Craspedostauros decipiens, Nitzschia laevis, Gomphoseptatum aestuarii, Diploneis papula, Tabularia fasciculata and T. investiens; among them, C. decipiens, G. aestuarii and D. papula recorded the highest relative frequency rank (> 50%) in at least one sample. Some diatom species were previously reported from aquaculture facilities in Toyama prefecture, Sea of Japan coast, in which colder (< 10°C) DSW is used. Among six examined tanks, one tightly covered outdoor tank was prepared for the present study by running DSW for forty days before sampling. Two samples collected from a wall and detached colonies floating in the tank, included only 4 species, showing the cleanliness of DSW. Other samples were collected from five tanks of a variety of size, period and cultured organisms. Five samples collected from a wall or other substrata in three abalone (two outdoor and one indoor) tanks included 12 to 24 species; the richest flora (24 species) was recorded from a net cage in the indoor tank in which surface seawater (SSW) was also mixed for adjusting water temperature. The other two samples, collected from one outdoor kelp tank and one indoor shrimp tank (with some seaweed), included 8 and 4 species, respectively. We concluded that the inclusion of organisms, particularly abalone, as well as mixing of SSW increase the species richness of attached diatoms in DSW and that diatom species occurring in high frequency are adequate for high production in culture in DSW.
The attached diatom flora in the aquaculture facility, Kochi Prefectural Deep Seawater Laboratory, Muroto, Japan, in which Pacific deep seawaters (DSW) were pipelined from depths of 320 m and 341 m, was studied using light microscopy. A total of 37 species in 21 genera were recorded from the tanks (10-16°C). The popular identified species were Navicula agnita, Craspedostauros decipiens, Nitzschia laevis, Gomphoseptatum aestuarii, Diploneis papula, Tabularia fasciculata and T. investiens; among them, C. decipiens, G. aestuarii and D. papula recorded the highest relative frequency rank (> 50%) in at least one sample. Some diatom species were previously reported from aquaculture facilities in Toyama prefecture, Sea of Japan coast, in which colder (< 10°C) DSW is used. Among six examined tanks, one tightly covered outdoor tank was prepared for the present study by running DSW for forty days before sampling. Two samples collected from a wall and detached colonies floating in the tank, included only 4 species, showing the cleanliness of DSW. Other samples were collected from five tanks of a variety of size, period and cultured organisms. Five samples collected from a wall or other substrata in three abalone (two outdoor and one indoor) tanks included 12 to 24 species; the richest flora (24 species) was recorded from a net cage in the indoor tank in which surface seawater (SSW) was also mixed for adjusting water temperature. The other two samples, collected from one outdoor kelp tank and one indoor shrimp tank (with some seaweed), included 8 and 4 species, respectively. We concluded that the inclusion of organisms, particularly abalone, as well as mixing of SSW increase the species richness of attached diatoms in DSW and that diatom species occurring in high frequency are adequate for high production in culture in DSW.