Butis butis, commonly known as crazy fish or upside down sleeper, is a species of sleeper goby belonging to the genus Butis. They are small drably colored fish, reaching a maximum length of only 69 to 155 mm (2.7 to 6.1 in). They are predatory and are known for their behavior of swimming vertically – or even upside down – while hunting. They inhabit brackish and freshwater coastal habitats of the Indian Ocean and the western Pacific Ocean.
Crazy fish were first described by the Scottish naturalist Francis Buchanan-Hamilton in 1822. They are classified under the family Eleotridae.
Read more about Crazy Fish: Description, Taxonomy and Nomenclature, Distribution and Habitat, Ecology and Behavior, Importance
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