ABSTRACT

Osaka bay located in western Japan is one of the famous semi-closed water areas in Japan. Around this bay, the natural beach almost completely disappeared due to the development of the seafront zone. On the other hand, former Osaka bay has rich fishery resource; it was called "Chinu-no-Umi" which means "sanctuary for black sea bream". The environmental rehabilitation of Osaka bay is citizen's longtime hope. In this study, first, we divided Osaka bay into 5 sea areas and examined temporal and spatial change (1973–2005) on water quality, such as COD (Chemical Oxygen Demand) and DO (Dissolved Oxygen). Second, we also examined temporal and spatial change on the amount of catches of Japanese blue crab and black sea bream. Japanese blue crab and black sea bream are the symbol of wide-ranging and benthic animal in Osaka bay, respectively. Finally, using the statistical approach, the relationship between water quality improvement and the recovery of fishery resources was clarified.

Keywords:
black sea bream, time lag, cod, machine learning, correlation coefficient, sennan area, time series, bottom layer, water quality, fishery resource
Subjects:
Environment
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2013. International Society of Offshore and Polar Engineers
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