진해만 해양환경변화에 따른 수산생산성지표 해석

Abstract

Jinhae Bay is a typical aquaculture farm with active fisheries. However, it has been contaminated by the development of a major city and industrial area, and has therefore diminished in value as a fishing ground. To preserve the continuing productivity of the ocean, this study have to estimate fisheries resources. To analyze the fisheries resources in Jinhae Bay, this study evaluated the Fisheries Productivity Index(FPI). The FPI is composed of the Total production(Tp), Total amount(Ta), and Production of edible protein(Ep), nitrogen(Np) and phosphorous(Pp). To calculate the FPI, this study used Annual statistics on cooperative sales of fishery products data from 1979 to 2004 and the Food composition table. The results of the FPI were as follows. Tp ranged from 70,235 tons to 113,556 tons and Ta ranged from 107,004 million won to 373,776 million won. Ep ranged from 8,124 tons to 13,357 tons, Np ranged from 1,965 tons to 3,273 tons, and Pp ranged from 168 tons to 276 tons. According to the FPI, maximum fisheries productivity occurred in 1994, when Ta, Ep, Np and Pp were at their highest values. To analyze annual variation of FPI by environmental change, we compared water quality, Oxygen Deficient Water mass and inflowing pollutant loads between Tp. The daily averaged pollutant loads of COD, TN, TP, DIN and DIP inflowing into Jinhae bay from 1992 to 2004 year were estimated about 16,152 kg-COD/day, 6,082 kg-TN/day, 254 kg-TP/day, 3,560 kg-DIN/day and 177 kg-DIP/day. Annual averaged inflowing pollutant loads were estimated about 5,896 ton-COD/year, 2,231 ton-TN/year, 93 ton-TP/year, 1,299 ton-DIN/year and 65 ton-DIP/year. According to the results of correlation analysis between inflowing pollutant loads and Tp, TN is the highest relationship between Tp. In terms of the results of the fisheries productivity the highest, the 1995 was the period when TN load and DIN load were at its maximum and the area of oxygen-deficient water mass was relatively little. According to these results, to increased marine productivity, we have to conserve water quality and maintain proper nutrient supplies.