This study aim to evaluate the environmental toxin (organics and inorganics) in seawater, marine sediment, and find the relationship of environmental toxins and marine cultivated species at aqua cultural and industrial sites.

- Sciences. This present study evaluated the inorganic toxin (eight heavy metals), 28 persistent organic pollutants (OCPs), 14 Polychlorinated Biphenyls (PCBs) and 18 Polycyclic Aromatic Hydrocarbons (PAHs) in seawater, marine sediment and five marine organisms from two aquacultural and two industrial sites in Khanh Khoa province.

+ The results showed that inorganic and organic toxins in the seawater from both aquacultural and industrial sites were lower than the national standards. In the marine sediment, the Cu concentration in marine sediments collected at Cam Ranh exceeded the national standards. The SQG-Q index at Cam Ranh Bay was highest, and having ecological risk. The concentration of organic pollutants at Cam Ranh Bay were much higher than other sites. In the similar way, Cam Ranh and Thuy Trieu were polluted by organic compounds. The HCHs, DDTs (OCPs) and DEHP (PAHs) were commonly found. Dieldrin (OCPs) in marine sediment at aquacultural sites exceeded the national standards. For seafoods, the Pb bioaccumulation in sea snail Babylonia areolata exceeded the national standards, and the bioaccumulation of DEPH (PAHs) in Marcia hiantina at Thuy Trieu was much higher than other species;

+ This present study also presented the new checked list if marine macro algae in Viet Nam with 879 species including two new species for science. In addition, the present study estimated the seagrass distribution in Viet Nam with 15.613 hectare, and the loss of seagrass beds was 45,6%.

- Scientific papers in SCIE journals (list):

Nguyen XV, Liao ML, and Lin SM. 2023. Systematic revision of the Grateloupia complex (Rhodophyta) from Vietnam using rbcL and LSU sequences, with the description of Phyllymenia nhatrangensis sp. nov. Phycologia 62(5), 436-444. doi: 10.1080/00318884.2023.2247175.

Nguyen XV, Nguyen XT, Kittle PR, McDermid JK. 2022. Meristotheca lysonensis sp. nov. (Solieriaceae, Rhodophyta), a new flattened species from Vietnamese waters. Phytotaxa 574(2), 137-148. doi:10.11646/phytotaxa.574.2.2

- Scientific papers in VAST2 journals (list):

Nguyen XV, Nguyen-Nhat NT, Nguyen XT, Le-Ho KH, Pham DT, Dao VH. 2023. Effect of environmental parameters on the content and sugar composition of sulfated polysaccharides in some tropical seagrass. Vietnam Journal of Marine Science and Technology. doi: 10.15625/1859-3097/18053

Nguyen XV, Phan TTH, Cao VL, Nguyen-Nhat NT, Nguyen TH, Nguyen XT, Lau VK, Hoang CT, Nguyen TMN, Nguyen MH, Dao VH, Teichberg M, Papenbrock J. 2022. Current advances in seagrass research: A review from Viet Nam. Frontiers in Plant Science. 13: 991865. doi: 10.3389/fpls.2022.991865

 

Other products

+ Dataset of eight heavy metals, OCPs (19), PCBs (14) and PAHs (19) in seawater at Van Phong, My Giang, Thuy Trieu and Cam Ranh;

+ Dataset of eight heavy metals, OCPs (19), PCBs (14) and PAHs (19) in marine sediment at Van Phong, My Giang, Thuy Trieu and Cam Ranh;

+ Dataset of eight heavy metals, OCPs (19), PCBs (14) and PAHs (19) in three species of seafood (Trachinotus blochii, Litopenaeus vannamei, Babylonia areolata) at Van phong and Thuy Trieu (Epinephelus lanceolatus, Litopenaeus vannamei, Marcia hiantina);

+ Dataset of eight heavy metals, OCPs (19), PCBs (14) and PAHs (19) in three species (Trachinotus blochii, Litopenaeus vannamei, Babylonia areolata) at My Giang and three species (Trachinotus blochii, Litopenaeus vannamei, Babylonia areolata) at Cam Ranh;

+ Dataset of heavy metals in seaweed Caulerpa lentillifera at Van Phong; 01 dataset of Cu and phytochelatines (PC)n in Caulerpa lentillifera in experiments;

+ Reports of two new seaweed species that collected in Central Viet Nam for science;

+ Final report of the project.

- Product of education: 01 PhD student are studying following direction of this project.