Title Isoyake Studies in Shizuoka Prefecture, Japan
Authers Masatoshi HASEGAWA
Citation Bull. Fish. Res. Agen. No.32, 109-114, 2010
Abstract
A type of isoyake in which Ecklonia forest died suddenly has been known in Izu Peninsula in Shizuoka Prefecture since 1911. On the Hainan Coast, the kelp forest which was the biggest in Japan has disappeared by isoyake in Japan. We struggled for the establishment of restoration of kelp and for clarification of the cause of the isoyake of Hainan Coast. The isoyake on Hainan coast was not affected by the high water temperature as was reported in Izu Peninsula of the Shizuoka Prefecture, but was thought as follows. The light condition deteriorated as a background of the isoyake. As a result, the productivity in the Ecklonia population was lowered. In addition, browsing by rabbitfish joined as a factor of the persistence of isoyake. By the observation on the alteration of generation in isoyake area in Izu in 2004, it was thought that the browsing of the parrotfish seemed to be a factor of isoyake.
URI http://www.fra.affrc.go.jp/bulletin/bull/bull32/109-114.pdf