Misgurnus anguillicaudatus

From Freepedia

The Dojo Loach (or Weather Loach) is, like many other loaches, a slender and eel-like and fish from Asia. A generally drab gray to light brown fish with lighter undersides, the Dojo can reach lengths of 12 inches or more. The mouth of the Dojo is surrounded by three sets of barbels. The unusual fish is very active and peaceful in the aquarium and can even be somewhat friendly to humans. Many Dojo Loaches have even been known to let their owners "pet" them and may be hand fed.

The Dojo, is also called a weather loach. This is because before a storm, the barametric pressure changes. This change is known to make the loach more active.

A larger, similar fish is indigenous to parts of Europe but is seen less in aquariums (probably due to its size).