

FOLLOWUS
1.Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City700000, Vietnam
2.Faculty of Environment, Saigon University, Ho Chi Minh City700000, Vietnam
3.Guangdong Provincial Key Laboratory of Marine Disaster Prediction and Prevention, and Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou515063, China
4.Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City700000, Vietnam
5.Asian Center for Water Research (Centre Asiatique de Recherchesur l'Eau, CARE), Ho Chi Minh City University of Technology (HCMUT), Vietnam National University, Ho Chi Minh City700000, Vietnam
phamthanhluu@tdtu.edu.vn
Received:12 March 2024,
Published:01 November 2024
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PHAM Thanh Luu,BUI Manh Ha,NGUYEN Tan Duc,et al.Occurrence of microcystins in water, sediment, and aquatic animals in Dau Tieng Reservoir, Vietnam[J].Journal of Oceanology and Limnology,2024,42(06):1751-1763.
PHAM Thanh Luu,BUI Manh Ha,NGUYEN Tan Duc,et al.Occurrence of microcystins in water, sediment, and aquatic animals in Dau Tieng Reservoir, Vietnam[J].Journal of Oceanology and Limnology,2024,42(06):1751-1763. DOI: 10.1007/s00343-024-4077-x.
This study investigates the variations of microcystins (MCs) in water
cyanobacterial blooms
sediment
and aquatic organisms collected from the Dau Tieng Reservoir (DTR). Vietnam. High-performance liquid chromatography (HPLC) was employed to measure MC concentrations in various target samples. Results indicate that
Microcystis
spp. dominates as the primary MC producer in the DTR. The average concentrations of analyzed MCs in surface water ranged from 1.10 to 5.54 µg/L
temporally and spatially. In sediment
average concentrations varied from 0.15 to 1.13 µg/g wet weight (WW) temporally and from 0.41 to 0.72 µg/g WW spatially. MCs were detected in different organs of fish species (
Oreochromis
sp. and
Labiobarbus
sp.) and in the entire soft tissues of bivalve (
Corbicula
sp.) and gastropod (
Assiminea
sp.). The highest observed MC concentration in July was 0.83±0.22 µg/g WW in the intestines of fish
Oreochromis
sp. The presence of MCs in grass shrimp
Palaemonetes
sp. was observed solely in June
reaching a concentration of 0.28±0.19 µg/g WW. This is the first report of MC accumulation in the
grass shrimp
Palaemonetes
sp. during field collection. For the bivalve
Corbicula
sp.
the presence of analyzed MCs was consistent throughout the study period
except for March and September
with the highest concentrations in July at 0.77±0.1 µg/g WW. Pearson correlation analysis revealed significant positive correlations between MCs in water and sediment with MC concentrations in aquatic animals
indicating the potential transfer of MCs across different trophic levels. The estimated daily intake values for analyzed MCs indicate that fish collected from the DTR are considered safe for consumption
as long as only the edible organs
such as the muscle
are consumed. However
bivalves or gastropods collected from the DTR are not safe for human consumption. This study underscored the importance of monitoring MC accumulation in aquatic animals used as food to mitigate adverse effects on human health.
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