"Summer habitat use of adult Sakhalin taimen in a tributary of the Teshio River, Hokkaido, Japan: Management implications for habitat conservation."
2002
"Sagawa, S. (Docon Co. Ltd., Sapporo (Japan)) | Yamashita, S. | Nakamura, F. "
"Summer habitat use of adult Sakhalin taimen in a tributary of the Teshio River, Hokkaido, Japan.: Management implications for habitat conservation. Shirou SAGAWA, Shigeaki YAMASHITA (Environmental Assessment Dept, Docon Co., Ltd., Sapporo 004-8585, Japan) and Futoshi NAKAMURA (Department of Forest Science, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan). Japane Journal of Ecology 52: 167-176 (2002). The summer habitat of adult Sakhalin taimen (Hucho perrvi) was studied in a fourth-order tributary of the Teshio River, Hokkaido. Sakhalin taimen selected large pools with slow water velocity and canopy shade or cover (especially canopy shade). The maximum number of Sakhalin taimen observed in pools during three censuses was positively correlated with the percentage of canopy shade or cover. while the maximum body size was positively correlated with the bed area. The study section had a reach within some nature-oriented river works, but no taimen were found there, probably because of insufficient pool sizes and canopy shade or cover patch for this species. 0n the other hand, Sakhalin taimen in this study stream are known to spawn from May to June in first-, second- and third-order streams where meandering channels and riparian forests are well preserved. These results suggest the importance of preserving large deep pools with canopy shade or cover and allowing adult taimen to migrate uqstream (first-, second- and third-order streams) and downstream (fourth-order streams) throughout the river system."
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