Utility of artificial settlement collector using crustose coralline algae for sampling abalone larvae in southwestern Japan
2006
Kiyomoto, S.(Seikai National Fisheries Research Inst., Nagasaki (Japan)) | Watanabe, S. | Suenaga, T. | Yamanaka, H. | Fujii, A. | Koshiishi, Y. | Horii, T.
To assess the utility of artificial settlement collectors in southwestern Japan, collecting trials for abalone were carried out at Hirado and Iki, northwestern Kyushu, from Oct. 2001 to Feb. 2002 using settlement plates with different algal species. Corrugated polyvinyl chloride plates were conditioned as settlement plates with four treatments: high cover (30-80%) with crustose coralline algae (H-CCA), low cover (5-40%) with crustose coralline algae (L-CCA), cover with Myrionema sp. (MY), and no conditioning (NC). Most of the postlarvae (440 to 1250 mum) were collected from mid November to early December. The largest number of postlarvae were collected by H-CCA plates, followed by L-CCA and MY plates, and no postlarvae was collected by NC plates. These results suggested that the H-CCA conditioning was the most effective among the four treatments, and some conditioning of settlement collectors is necessary to optimize settlement of abalone larvae.
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