My initial thought when watching this video was, “why would anyone want to make a robotic fish?”. especially when it seems to be a toy and as a toy or a pet or even food, fish just arent that fun. however, after doing some research i found that the Robot Fish is actually widely used in the fields of ocean development, ocean investigation, and marine environmental protection. This robot is one of the few several test robots have already been developed. Swimming methods of fish are various and interesting; they have many specialized modes of movement. For example, eels swim waving its whole body. A flat fish, on the other hand, swims by waving long fins in special patterns, allowing it to hover, backup or turn quickly in any direction. In this study,the focus is on fish such as the pike or tuna — fast and efficient swimmers. These fish accelerate with amazing quickness, turn easily, and attain great speed all while using very little energy. These kinds of fish move by coordinated side-to-side motion of their tail fin.