(Børsabergan - The Trondheim fjord / 20 meters / 11.30.2003)

Phylum: Chordata

Superclass: Gnathostomata

Class: Elasmobranchii & Holocephali

 

Norwegian: bruskfisker

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The skeletons of cartilaginous fish like sharks, skates, rays are made of flexible cartilage, rather then bone. Only their teeth and in some cases the spine, is calcified. They lack the air bladder of the bony fishes. They have paired fins.