Abstract
In the inner part of Osaka Bay, eutrophication has resulted in deterioration in quality of water and bottom sediments, while in western part of the bay, oligotrophication has resulted in serious damage to laver culture such as bleaching of "nori". A pilot project is underway in Hyogo Prefecture which seeks to adjust nutrient imbalance through cultivating sea bottom. We carried out field survey of water quality in the pilot project area. According to the results, "cultivation of sea bottom" is an effective method to adjust seawater nutrient imbalance.
