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Microbial contamination in the coastal aquaculture zone of the Ba Lat river mouth, Vietnam

2023; Elsevier BV; Volume: 192; Linguagem: Inglês

10.1016/j.marpolbul.2023.115078

1879-3363

Nhu Da Le, Thi Thu Ha Hoang, Thi Mai Hương Nguyen, Emma Rochelle‐Newall, Thi Minh Hanh Pham, Thi Xuan Binh Phung, Thi Thuy Duong, Thi Anh Huong Nguyen, Le Minh Dinh, Thanh Nghi Duong, Tien Dat Nguyen, Thi Phuong Quynh Le,

Water Treatment and Disinfection

Contamination of aquaculture products by pathogenic organisms is a major concern in areas where this activity is of high economic importance. The abundances of total coliforms (TC), Escherichia coli (EC) and faecal streptococci (FS) (in CFU.100 mL-1) in seawater in the Red River coastal aquaculture zone were determined. The results showed TC numbers (200 to 9100; average 1822), EC (<100 to 3400; average 469) and FS (<100 to 2100; average 384), of which TC exceeded the allowable threshold of the Vietnam regulation for coastal aquaculture water. TC and EC numbers in 4 wastewater types (domestic, livestock farming sewage, agricultural runoff, and mixed sewage canals) were investigated and revealed the importance of point sources of faecal contamination in seawater. These results underline the need to reduce the release of untreated wastewater and to put into place seawater microbial quality monitoring in areas where the development of sustainable aquaculture is an objective.