- 著者
-
西田 睦
澤志 泰正
西島 信昇
東 幹夫
藤本 治彦
- 出版者
- 日本水産學會
- 雑誌
- 日本水産学会誌 (ISSN:00215392)
- 巻号頁・発行日
- vol.58, no.2, pp.199-206, 1992
- 被引用文献数
-
17
24
The distribution and abundance of an endangered subspecies of the ayu <i>Plecoglossus altivelis ryukyuensis</i> was determined on the three major islands, Amami-oshima, Tokunoshima, and Okinawa Islands, in 1986. The fish was observed only in five streams in the southern part of Amami-oshima Island. Among these five streams, the majority of fish were found in the Yakugachi River. While the number of fish in this particular stream was approximately 3.5×10<sup>4</sup>, in all other streams the densities were much lower, and we therefore conclude that this subspecies is threatened and some attempts should be made for conservation of this fish.