What Are the principle Varieties ofFish?
Fish are categorized into 3 principal types dependent on their skeletal composition and respiratory programs:

Bony Fish (Osteichthyes): This class features 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 multiple gill slits devoid of covers.

Jawless Fish (Agnatha): Primitive fish like lampreys and hagfish belong to this classification. As opposed to other fish, they deficiency jaws and depend upon suction or other unique feeding procedures.