A fish is a poikilothermic (cold-blooded)* water-dwelling vertebrate with gills. There are over 27,000 species of fish, making them the most diverse group of vertebrates.
Response last updated by Shadowmyst2004 on Aug 21 2016.
Apr 05 2006, 7:09 PM
Thre is a fish that swims vertically, I saw it on the telly , they swim in schools and it is so they can be camouflaged in the grasses. It was amazing as when they go into a grass field they literally disappear. from view. It was a documentary about camouflage and protection mechanisms.
The sea horse is one fish that swims upright. Another is the shrimp fish of the Indian Ocean, which congregates in schools of several individuals and swims vertically. A catfish indigenous to the Nile and other African rivers also swims in the vertical posture. Many kinds of midwater deepsea fishes swim or rest vertically.
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