Gillnet is the most important fishing gear in World’s inland fisheries e.g. Greece (Stergiou and Erzini,
2002); Sri Lanka (Pet et. al., 1995) and Thailand (Jutagate et al, 2001). Some papers mentioned to
efficiency of gillnet by studying its selectivity as well as the relationship between selectivity and fish
morphology (Reis and Pawson, 1999; Hovgård and Lassen