Question

Which are the two types of fishes based on skeleton?

Answer 1

Fish are divided into three main types. They are divided into these groups based on the structure of their mouths and the types of skeletons they have. There are jawless fishes, cartilaginous fishes, and bony fishes.

All three types are "cold-blooded," or ectotherms. This means that they can't control their body temperature internally. Their body temperature is similar to the temperature of their outside environment.

1. Agnatha (Jawless fish): They do not have jaws, scales, a stomach or paired fins but have an embryonic vertebral column (notochord) for their entire lives and a skeleton made of cartilage.Skeletons made from cartilage are tough and flexible and allow fish to grow to large sizes and to swim quickly. E.x: Lampreys and hagfish

2. Cartilaginous: Cartilaginous fish have a skeleton made of cartilage. Cartilaginous fish include sharks, rays, skates and chimaeras (ghost sharks).

3. Bony fish: (also known as Ray-finned fish) are the largest of the three groups of fish with almost 27,000 species such as salmon, trout, lanternfish, cavefish, cod, anglerfish, tarpon, herrings, electric eels and much more. Bony fish have a skeleton made of bone.