Lake Toya
Organization
Toya Lake Station, Field Science Center for Northern Biosphere, Hokkaido University
Research Theme
Lake Toya Wise Use: Synthetic studies for the compatibility of the lake environment conservation and the fish resource management
Site Outline
The Toya Lake Station is located on the shore of Lake Toya in the southwestern part of Hokkaido, Japan (42o36′ N, 140 o47′ E). The station consists of a hatchery house, 3 large fish ponds, 20 FRP aquariums, where kokanee salmon (Oncorhynchus nerka) and land-locked masu salmon (O. masou) are reared using spring water (40 ton/hr) from Mt. Yotei, and a research laboratory and office building in about 1 km2 site. Lake Toya is a large oligotrophic caldera lake in the Shikotsu-Toya National park, and is repeatedly affected by the volcanic activity of Mt. Usu, which has periodic eruptions on a 23-50 year cycle. The surface area is 70.4 km2, and average and maximum depths are 116.3 m and 179.0 m, respectively. The annual average concentrations of Total-P, Total-N, chlorophyll a and COD at the lake surface are 3, 150, 0.3 and 600 μg/l, respectively. This lake water is used for hydroelectric power, agricultural irrigation, and as a supply of drinking water.
Contact
- Address : 122 Tsukiura, Toyako, Abuta, Hokkaido 049-5723, Japan
- Name : Etsuro Yamaha
- Phone : 0142-75-2651
- Fax : 0142-75-2943
- E-mail : eyamaha@fsc.hokudai.ac.jp