Fig. 1 Fishing Locations in Tokyo Bay, Sagami Bay and the Choshi Sea.

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1 Mercury Concentration of Fish in Tokyo Bay and the Surrounding Sea Area Ruijun ZHANG, Yuji KASHIMA, Mitsuaki MATSUI, Toshiko OKABE and Rikuo DOI Department of Hygiene, Yokohama City University School of Medicine, Yokohama Abstract Total mercury in the muscles of three fish species was analyzed in fish caught in Tokyo Bay and the surrounding sea areas, Sagami Bay and Choshi. Tokyo Bay is a semi-closed sea area surrounded by Tokyo, Kanagawa and Chiba prefectures. Sagami Bay and Choshi are open to the Pacific Ocean. A total of 412 fish consisting of northern whiting (Sillago japonica), flatfish (Limanda yokohamae) and sardine (Sardinops melanosticta) were caught in these areas over a 6 months period from November 1998 to April mercury concentrations and body length or body weight in northern whiting and flatfish, irrespective of the sea area. A correlation was also found between mercury concentration in fish and their feeding habits: among the 3 species caught in the same area, crustacean feeding northern whiting had the highest, polychaete feeding flatfish moderate, and plankton feeding sardine had the lowest mercury concentration. In a comparison of mercury concentration in the same species caught in different sea areas, a higher concentration was noted in fish caught in the semi-closed sea area of Tokyo Bay, than in fish caught in the open sea areas of Sagami Bay and Choshi. This difference was most marked in fish caught at the bottom of Tokyo Bay and we considered that the mercury concentration of seawater and sediment in these areas was the cause of mercury accumulation in fish. These findings suggest that improved water quality control and environmental monitoring is necessary in semi-closed sea areas such as Tokyo Bay. Reprint requests to: Ruijun ZHANG Department of Hygiene, Yokohama City University School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, , Japan TEL: +81(45) , FAX: +81(45)

2 Fig. 1 Fishing Locations in Tokyo Bay, Sagami Bay and the Choshi Sea.

3 Table 1 Mean Body Weight, Length, and Range, Median and SD of Total Hg Concentration Table 2 Fish Body Length-Hg Concentration Regression Equation, R and Probability

4 Fig. 2 Body Length-Total Hg Concentration Scatter Diagram of Fish Species.

5 Fig. 3 Body Length-Total Hg Concentration Scatter Diagram of Fisheries.

6 Table 4 Principal Ingredient Point and Order of Fish Hg Level of Fishery Fig. 4 Cluster Dendrogram of Fishing Locations.

1) Francesconi AK, Lenanton RCJ. Mercury Contamination in a Semi-enclosed Marine Embayment: Organic and Inorganic Mercury Content of Biota, and Factors Influencing Mercury Levels in Fish.

7 1) Francesconi AK, Lenanton RCJ. Mercury Contamination in a Semi-enclosed Marine Embayment: Organic and Inorganic Mercury Content of Biota, and Factors Influencing Mercury Levels in Fish. Marine Environmental Research 1992; 33: ) Irie T. Bioaccumulation of mercury by marine Fish. Proceedings Japanese-French Workshop on Recent Progress on Knowledge of the Behaviour of Contaminants in Sediments and Their Toxicity to Aquatic Organisms. National Research Institute of Fisheries Science 1994: ) Kannan K, Smith RG, Jr, Lee RF, Windom HL, Heitmuller PT, Macauley JM, Summers JK. Distribution of total mercury and methylmercury in water, sedoment, and fish from South

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南太平洋におけるマグロ類とマカジキの体長と体重の関係について

NAOSITE: Nagasaki University's Ac Title 南太平洋におけるマグロ類とマカジキの体長と体重の関係について Author(s) 古賀, 重行 Citation 長崎大学水産学部研究報告, v.21, pp.23-31; 1966 Issue Date 1966-11 URL http://hdl.handle.net/10069/31460 Right This document