27 acquatic lifeforms you’ve never caught, (because they are so rare or are deep sea creatures) including this excellent robot fish. The robot fish is located at the London Acquarium: 
Computer scientists at the University of Essex in the U.K. developed the self-guided robot fish, seen here swimming in the aquarium. The designers say it is the smartest such robot yet created—the fish uses artificial intelligence and built-in sensors to avoid obstacles and respond to environmental changes.  Â