In general it can be said that the predator P. ramburi enough effective because of the nature of the type II functional response criteria or hyperbolic functional response is when the rate of predation decreases with increasing prey density, prey maximum mortality occurred at low prey densities. This is consistent with one of the criteria for determining the effectiveness of a predator that can be measured by its ability to find prey at low prey densities and consume many prey upon abundant prey populations [16].