Distribution of Spawning Space of Oncorhynchus masou masou Accordig to Spatial Changes of River Bed

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  • 山地河川における階段状河床地形とヤマメ(Oncorhynchus masou masou)産卵床の形成位置に関する研究
  • サンチ カセン ニ オケル カイダンジョウ カショウ チケイ ト ヤマメ On

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Abstract

Survival system of fish (Oncorhynchus masou masou) in devastated river is owing to space for spawning. But in devastated river, spatial and temporal changes of river bed are occurred by current with diverse scales. A purpose of this study is to clear the relationship between spatial changes of river bed and space of spawning. Distribution of river depth, current velocity and diameter distribution of bed load in pools were analyzed along river channel consisting from many pool-step profiles. Results are as follows, Fish locates a space between ordinary flow zone and jet flow zone (Froude number=1) for spawning. At the same time, coarse sand, granule and pebble are necessary for spawning. The space with these conditions was found out at lower part of pool, that is changed by small scale transportation of bed load. The pool with these spawning space was located in the section consisting of continual large pools, that is changed by middle scale transportation of bed load.

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