Evaluation of Ayu Habitat in the Planned Ship Bottom Section Channel of the Monobe River

Key Points

• The aim is to evaluate the habitat suitability for ayu fish in the Monobe River's planned channel after flooding.
• Applied the habitat suitability index developed by Tashiro et al. to assess current river conditions.
• Matched results with monitoring data to confirm the efficacy of the evaluation method.
• Analyzed changes in habitat quality post-flood in the planned channel.
• Investigated the impact of stone placement on flow diversity.
• Measured the area with a CSI value above 0.7.
• The area with a CSI value of 0.7 or higher increased post-flood.
• Qualitative improvements in habitat quality were observed after flood events.
• Introduction of stone placement created flow diversity, benefiting the resting environment for ayu.