What Are the principle Varieties ofFish?
Fish are categorized into 3 principal types centered on their skeletal structure and respiratory devices:
Bony Fish (Osteichthyes): This class includes species like salmon, trout, and cod, accounting for approximately 96% of all fish species. Their skeletons are created of bones, and they've operculum (gill handles) for respiration.
Cartilaginous Fish (Chondrichthyes): Fish like sharks, rays, and skates fall into this team, characterized by skeletons crafted from cartilage. They normally have various gill slits with no covers.
Jawless Fish (Agnatha): Primitive fish like lampreys and hagfish belong to this group. In contrast to other fish, they deficiency jaws and count on suction or other unique feeding approaches.