Microplastics that enter the water body might accidentally swallowed by aquatic organisms including fish. Thynnichthys thynnoides is a microphagous fish that lived in the Teluk Petai lake and feed mainly on phytoplankton, periphyton, algae and small zooplankton and thus the microplastics may be accidentally swallowed as the fish engulfed their food. To understand the microplastics present in th…