
Lemon Shark - Negaprion brevirostris
Lemon Sharks got their name from the yellowish tint on their skin.
They are among a few species of Sharks that does not need to constantly swim to breath as they have the ability to pump fresh water over its gills while it rest on the sea bottom.
In this picture, this Lemon Shark was resting on the sea bottom and getting cleaned by a Remora.
Picture of the whole Shark can be seen here :

The lemon shark, ''Negaprion brevirostris'', is a shark in the family Carcharhinidae, can grow to 10 feet long. It is known as the lemon shark because light interacting at certain depths with the local seawater can give this shark a tanned and yellow, pitted appearance, much like the surface of a lemon.