INFLUENCE OF MARINE ENVIRONMENTAL FACTORS ON THE DISTRIBUTION AND FLUCTUATION OF MARINE RESOURCES IN SOUTHWESTERN SEA OF VIETNAM

Abstract

The Southwestern region of Vietnam has great potential for economic development with the highest annual value in fisheries exports of the country. The climatic conditions and environmental characteristics have affected waters directly to the distribution and fluctuations of biological resources. The research results show that the catch per unit effort (CPUE) of marine resource groups with marine environmental factors existed a rather close relationship (correlation coefficient (R0) between 0.4 and 0.7). In the northeast monsoon, the relationship was weaker than the southwest monsoon. Fish concentration was inversely correlated with temperature and salinity and is positively correlated with chlorophyll a and sea currents. CPUE was usually high from July to December when the temperature ranged from 27.5 °C to 29.5 °C, the salinity was low and the research area was heavily influenced by water from the continent. Different aquatic species have different habitat suitability indices according to marine environmental factors (temperature, salinity, chlorophyll a, water mass disturbance, etc.) and are also different between the northeast monsoon and the southwest monsoon in the region.
Keywords: Marine environment, marine resources, habitat suitability index, marine
environmental factor, Southwestern region.