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The assessment on the levels of microcystins in water
and Nile tilapia in Phayao lake caused by the presence of
cyanobacteria i.e. Microcystis, due to nutrient enrichment
(eutrophication) should, therefore, be of great concern.
The communities normally use water from Phayao Lake
as raw water for household consumption, agricultural
and industrial use and the lake as source of food and
livelihood for local fishermen. The present study has also
suggested that Microcystis species and microcystins in
cultivation ponds in Chiang Rai, may pose a possible
hazard to aquatic organisms and to humans through the
food web. Consumers that feed on fish from these aqua-
culture ponds may be at the risk of continuous micro-
cystins poisoning. It is therefore recommended that fish
farmers should develop management strategies to control
cyanobacterial growth and minimize the incidence of
bioaccumulation of microcystin in cultured fish.
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