SOME ENVIRONMENTAL ISSUSE IN MARINE FISH CAGED AQUACULTURE AREA CAT BA - HAI PHONG AND LONG SON - VUNG TAU

Abstract

Research results show that water pollution occurs in marine fish caged aquaculture areas in Cat Ba - Hai Phong and Long Son - Vung Tau. For water environment: DO content of water is lower than permissible limit (≥5.0 mg/l), the lowest is 3.76mg/l; there was a time when 100% of samples had low DO content. The content of parameters N-NH₄⁺, N-NO₃^-, P-PO₄^3- and Coliform density in water exceeds the permissible limit by 1.1-14.2 times and is high in the period 2016-2021. Water environment Cat Ba farming area is polluted (RQ at levels 1 and 2) at low and medium levels. Water environment in Long Son farming area is polluted (RQ at levels 3 and 4) at high and polluted levels. very high. Low diversity index value H', high density of toxic algae shows that the water environment is affected by environmental pollution.