Which fish have a paddle tail?
A paddle tail is a rounded tail on a fish. It is usually vertical (up and down), and it moves side to side.
Eels have paddle tails. Some newts have paddle tails. Knifefish have paddle tails. Lungfish have paddle tails. Aquatic leeches have paddle tails.
A paddle tail is used for locomotion. A paddle can push through water using less muscle power, making each stroke very efficient. It enables fish to use a constant, steady movement for a long period of time. Therefore, fish with paddle tails can be fast without using much energy.
Photographer: Martina Nicolls
Martina Nicolls: SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM