It was seen by means of single mesh that Lc was increased by mesh size. In term of multi- meshes size, the Lc was reduced to 29.56 cm since the mesh of 4.5 and 5.5 cm could catch the small fish which is the majority in catch composition. To give the fish had an opportunity for reproduction, minimally once, before being caught; the Lm was approached as a criterion for deciding an optimum mesh size.