Swimming fish dynamics : laju gerak ikan, hambatan dan hubungannya dengan bentuk tubuh ikan

Abstract

The locomotion of Shark and Mackerel (Milkfish) were recorded by a video camera and the parameters (velocities and positions as a function of time) were extracted by The World in Motion 95 software. The extracted parameters then were analyzed in force parallel to the fish motion track, those are; drag force and propulsion force. By calculating these forces and comparing two fish with the same body shape, we would predict the relation between speeds, length, in the drag force formula. Surprisingly, we found that the large fish have grater speed than a small one (for the same body shape) and the length comparison of two fish is close to quadratic model of speed comparison.