2 オニヒトデの摂餌刺激物質(口頭発表の部)

概要

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In the tropical zones of the Indian and Pacific Oceans, the crown-of-thorns starfish Acanthaster planci destroys coral by eating it, but there is no effective extermination of the starfish. Okinawa prefecture have conducted extermination of the starfish at a great cost. We sought to establish the method for clean, effective and ecological extermination of the starfish Acanthaster planci. We recently found that the sea urchin Toxopneustes pileolus had a feeding stimulant for this starfish. We established a simple bioassay system in the aquarium to study this stimulant, which was found to be composed of two unsaturated fatty acids, arachidonic acid (1) and α-linolenic acid (2). Since commercially available 1 and 2 also exhibited attracting activitiy for the starfish, 1 and 2 were found to be active principles from the sea urchin Toxopneustes pileolus. Other unsaturated fatty acids such as eicosapentaenoic acid (3), docosahexaenoic acid (4), γ-linolenic acid (5), and linoleic acid (7) showed no activity. We have set traps with α-linolenic acid for catching the starfish Acanthaster planci in the Okinawan sea at the depth of 1.5-2.5 meters. Size of the trap is 1.5 meters square. We could catch several starfishes in the sea. Studies on a receptor of the starfish for arachidonic acid and α-linolenic acid and pheromonal function of arachidonic acid and α-linolenic acid are currently in progress.
天然有機化合物討論会の論文
2000-10-01