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Fish Species - Vertebrates Slideshow
While fish are the first species we discuss, you need to know that there have been many other simple vertebrates through the years. We have fossil evidence of those species, but none are alive today.
The fish species in these images are from the large Osteichthyes superclass. These bony fish are the most common of the fish you will find. Fish are found across the world in both salt and freshwater habitats. Characteristics of fish include the distict head region and gills that filter oxygen out of the water. There are some specialized fish which have unique characteristics. The Coelacanth is an ancient fish that was thought to be extinct. Fisherman caught one and surprised the scientific world. They have many traits of ancient bony fish species. There are also some species called lungfish that can survive out of the water for short periods of time. They are able to 'breathe' air as they 'crawl' through the mud with the front fins. Most fish have fins that are designed to move quickly through the water. Image Credit: Andrew Rader Studios
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