Abstract
The study was conducted to assess the distribution of seagrass around Hai Tac archipelago, Ha Tien city, Kien Giang province. From two survey trips in September 2018 and March 2019, using the field survey methods of deep diving with SCUBA, photographing and sampling, the study has recorded 6 species of seagrass. These species were morphologically identified, namely: Cymodocea rotundata, Cymodocea serrulata, Halodule uninervis, Enhalus acoroides, Thalassia hemprichii, and Halophila ovalis. The seagrass beds occupied a surface area of approximately 30 hectares in Hai Tac archipelago. They mainly distributed in the Northeastern of Hon Doc, the East of Hon Truc Mon and the North of Hon Doi. In which, Thalassia hemprichii is always the most dominant species. In Hai Tac archipelago, the segrass’s shoots density was about 201 ± 34 shoots/m2; the average of coverage was 33.8 ± 15.1%; the average of biomass was 690 ± 267 g/m2; seagrass resource was estimated at 207 ± 80 tons. The research results are an important scientific basis for orienting the rational use of biodiversity and aquatic resources in the Southwestern of Vietnam.
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