Question

Respiration in cartilaginous fishes write short notes

Answer 1

Explanation:

Cartilaginous fish The individual lamellae of the gills lie on either side of the septum.

In slow-moving or bottom dwelling species, especially among skates and rays, the spiracle may be enlarged, and the fish breathes by sucking water through this opening, instead of through the mouth

Answer 2

Cartilaginous fish The individual lamellae of the gills lie on either side of the septum. ... In slow-moving or bottom dwelling species, especially among skates and rays, the spiracle may be enlarged, and the fish breathes by sucking water through this opening, instead of through the mouth.