INFLUENCES OF SEABED DISTURBANCE CAUSED BY DREDGE NET FISHERY ON WATER QUALITY AND PRIMARY PRODUCTION IN OSAKA BAY

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  • 底曳網漁業による海底擾乱が大阪湾の水質と一次生産に及ぼす影響

Abstract

<p> Seabed disturbance caused by bottom trawling (dredge net fishery) was considered as a new nutrient supply mechanism in Osaka Bay, and the nutrient load due to trawling was calculated based on fishery operational records and bottom sediment survey data. Three-dimensional flow and water quality simulations were also conducted to quantitatively evaluate the effects of fishery on water quality and primary production in the bay. As a result, it was estimated that the nutrient load by the bottom disturbance accounted for only 1-3% of the total load to the bay in summer, while it ranged from 4-14% in winter. Seabed disturbance caused by fishery increased nitrogen concentration and primary production along the eastern coastal area in winter, and also increased primary production of the entire bay by about 1.03%, indicating that the effects of dredge net fishery have a non-negligible effect on the lower ecosystem at the bay scale.</p>

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