Q- State the difference between the gill slits of a cartilage fish and a bony fish.
Answer- The Gill slits of bony fishes are different from that of cartilage fish. The main difference between gills slits of bony fish and cartilage fish is that the gill slits of cartilage fish are of 5 pairs and uncovered, while in bony fishes these are usually 4 pairs and is covered with operculum.