Title Restoration of Ecklonia cava forest on Hainan coast, Shizuoka Prefecture
Authers Yukio UNNO and Masatoshi HASEGAWA
Keywords Ecklonia cava, kelp forest, herbivorous fish, browsing, transplantation, gill net, fixed net
Citation Bull. Fish. Res. Agen. No.32, 119-124, 2010
Abstract
Along the coast of Hainan, extending from Sagara to Omaezaki on the west coast of Suruga Bay, Shizuoka Prefecture, the largest kelp forests comprising of Eisenia arborea Areschong and Ecklonia cava Kjellman have reduced since around 1985 and almost disappeared by 2000. As the result, catches of abalone and other marine fish and shellfish declined sharply along the coast. In order to avoid extinction of the kelp forest, Shizuoka Prefecture implemented a ‘Fisheries Infrastructure Development Project’ by deploying blocks implanted with E. cava thalli on the barren bottom formerly inhabited by the kelps. Furthermore, we also implemented another project to establish new methods of transplantation to cope with browsing by herbivorous fishes. In the project, restoration of E. cava forest was tried using ropes implanted with E. cava juveniles and removal of herbivorous fish by fixed net and gill net. The shoreline survey conducted in February 2008 revealed that 55 ha of E. cava forest was restored along the coast.
URI http://www.fra.affrc.go.jp/bulletin/bull/bull32/119-124.pdf