Nghiên cứu biến đổi hàm lượng chlorophyll a ở vùng biển Đông Nam Bộ phục dự báo ngư trường khai thác hải sản

Abstract

Chlorophyll-a is an important ecological and environmental parameter that is widely used in correlation analyses and in forecasting potential fishing grounds for marine fish species. Statistical analysis in the Southeastern Vietnam Sea reveals a positive correlation between chlorophyll-a concentration and the catch per unit effort (CPUE) of small pelagic fish. Chlorophyll-a levels are typically higher during the rainy season, with monthly averages of 0.53 and 0.51 mg/m³ in January and December, respectively, and decrease during April and May to 0.26 and 0.24 mg/m³. The spatial and temporal distribution of chlorophyll-a exhibits clear variability across different subregions of the study area. In coastal waters, chlorophyll-a concentrations peak in January and December (1.30 and 1.23 mg/m³), several times higher than those in offshore waters (0.23 and 0.24 mg/m³). The lowest concentrations occur in April–May nearshore and in May–June offshore. In January and October, several localized high-chlorophyll-a zones appear mainly from the waters off Vũng Tàu (Ho Chi Minh City) to Cà Mau Province, forming potential fishing grounds. In April and July, additional high-concentration areas are also observed around Phú Quý Island. Understanding these spatiotemporal distribution patterns provides a scientific basis for predicting potential fishing grounds based on environmental parameters, particularly chlorophyll-a.