Abstract
Phytoplankton including blue-green algal or cyanobacterial blooms frequently occurred in aquaculture ponds. Some cyanobacteria produced cyanotoxins that may accumulate in the food web and eventually in the aquaculture products. In this study, accumulatation of microcystins in Nile tilapia (Oreochromis niloticus) and giant freshwater prawn (Macrobrachium rosenbergii) cultured in green water system was investigated.Nile tilapia was cultured in green water system and fish food; green water system with Microcystis aeruginosa Kützingand fish food and green water system with M. aeruginosa. Giant freshwater prawn was cultured: in green water systems with and without toxic M. aeruginosa. Microcystins of 8.32±0.76 and9.35±1.45μg·kg—1 d.w. were detected in fish cultured in green water system with M. aeruginosa and fish food and in green water system with M. aeruginosa, respectively. Microcystins of 14.42±1.63 μg·kg—1 was found in prawn samples. It implied that aquaculture products were likely to be contaminated with microcystins. This finding is useful for aquaculture in terms of food safety.
Highlights
Thailand is the fourth ranking Nile tilapia (Oreochromis niloticus) producer in the world since 2000
Phytoplankton including blue-green algal or cyanobacterial blooms frequently occurred in aquaculture ponds
Some cyanobacteria produced cyanotoxins that may accumulate in the food web and eventually in the aquaculture products
Summary
Thailand is the fourth ranking Nile tilapia (Oreochromis niloticus) producer in the world since 2000. There are many aquaculture ponds throughout Thailand where giant freshwater prawns, Macrobrachium rosenbergii, are cultured. The prawns can be grown in all freshwater bodies [3]. They are commercially important because they are widely used for human consumption. The occurrence can create a significant water quality problem, including their ability to produce toxins, namely microcystins (MCs). The toxins accumulate in aquatic organisms and are transferred to higher trophic levels. It involves the risk for human exposure through the consumption of contaminated aquatic organisms [4,5,6]. The data would be useful for food safety aspect and public health to avoid the damaging effect of cyanobacteria and their toxins
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