Mitsubishi Heavy Industry Ltd. made the world’s first radio-controlled robotic fish called Coelacanth. The robot can swim to see visitors and recharge itself when the battery becomes low.
Ryomei Engineering, along with two companies, developed a robotic carp called Nishiki Koi. It can swim in reverse, observe oceanic fishes and can survey oilrigs and pipes for damages.
Ryomei Engineering created the Sea Bream for fish farms to draw in Japanese fishing enthusiasts who want to perfect their angling skills. The bot has a 30 minute battery life.