浅海養魚場における不稔性アナアオサ変異種の栽培

概要

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Water pollution by excess nutrients from coastal fish farms has become a serious problem. In order to reduce such eutrophication in the sea, an attempt to culture the sterile Ulva sp. was conducted in fish farms of Nagashima, Kagoshima Prefecture. The Ulva sp. used in this experiment was transferred from the Nagasaki Fisheries Experimental Station to our laboratory in 1987. Eighteen crab-traps were employed as culture cages of the Ulva sp. Stocking density was 8 g per cage. The cages were placed in a yellowtail farm at a depth of about 50 cm. The growth of the Ulva sp. and water temperature were observed every neap tide from September 1989 to September 1991. The average daily growth rate (DGR) of Ulva sp. was 21.7 % throughout the period. The higher DGRs, 23-30 %, were observed at higher temperatures of 25-28°C. On the contrary, the lower DGRs, 6-21 %, were obtained at lower temperatures of 13-15°C. Seasonal variation in growth was closely related to the variation in water temperature. The study suggested that the sterile Ulva sp. is a suitable aquatic plant for introducing a polyculture of seaweed and fish in the sea.
水産増殖談話会の論文