Q- Enlist six peculiar characters of cartilage fishes.
Answer- There are several peculiar characters of the cartilage fishes but the six main peculiar features or characters of cartilage fishes are as follows:
1. The exoskeleton is formed of cartilage in these fishes.
2. Mouth is ventral and the ending gut is anus in these fishes.
3. The heart of cartilage fish is 2 chambered and single circulatory.
4. The gill slits of these fishes sare 5 to 7 in pair and are covered with operculum.
5. The exoskeleton is formed of placoid scales.
6. These are exclusive marine.