The slowest moving fish is the pygmy seahorse, which swims at speeds of approximately 0.1 miles per hour. These tiny creatures are also the smallest fish, with a measurement of only 2 centimeters in length.
Two species of the pygmy seahorse, the Bargibant and the Denise, typically thrive in gorgonian coral in parts of Southeast Asia. However, they can also be found in other locations, such as Queensland, Australia's Great Barrier Reef. These fish use natural camouflage to protect themselves from predators, and they also avoid living in large groups. Unlike other kinds of seahorses, pygmy seahorses use pouches within their bodies to protect their young.