Mention eight important general characters of Pisces.
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1. They are the first jawed vertebrates and the study of fish is called Ichthyology.
2. They are aquatic (may be fresh water or marine).
3. Fish are cold blooded animals (poikilothermic).
4. Their body is spindle shaped or streamlined to enable them to move rapidly in water.
5. Body is covered with water proof dermal scales; which may be of placoid, cycloid, ctenoid or ganoid type.
6. Fins are the locomotary organs.
7. Pectoral and pelvic fins are paired whereas dorsal and caudal fins are unpaired.
8. Eyes are without eyelids.
9. External and middle ears are absent; only internal ear is present.
10. They consist of 4-7 pairs of gills for respiration which may be naked or covered with an operculum.
2. They are aquatic (may be fresh water or marine).
3. Fish are cold blooded animals (poikilothermic).
4. Their body is spindle shaped or streamlined to enable them to move rapidly in water.
5. Body is covered with water proof dermal scales; which may be of placoid, cycloid, ctenoid or ganoid type.
6. Fins are the locomotary organs.
7. Pectoral and pelvic fins are paired whereas dorsal and caudal fins are unpaired.
8. Eyes are without eyelids.
9. External and middle ears are absent; only internal ear is present.
10. They consist of 4-7 pairs of gills for respiration which may be naked or covered with an operculum.
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