Lake Izu (Izunuma) located in the northern part of Miyagi Prefecture, Japan is designated as a registered wetland under the Ramsar Convention and is one of the nation's most popular stopovers for migartory birds. However, in recent years the proliferation of non-native species including the large mouth bass and red swamp crayfish has led to fears of the extinction of native plant and animal species. This group has been studying methods for the preservation of native plants and animals including submerged plants, bivalve crustaceans, and small fish species and has placed floating islands planted with Indian rice (root curtains) in the lake. This has resulted in higher survival rates for small fish and has made possible the revival of production of bivalve crustaceans, with which the fish have a symbiotic relationship. Working together with elementary schools and vocational aid centers fibrous structures ('trees') that block non-native species have been constructed and placed in Izu Lake providing places of refuge for small fish-a lake bottom man made forest. Prototypes were made and tested and these structures will be manufactured, placed in the lake and their effectiveness monitored. In order to raise awareness of this project, site visits and forums will be held.