Fish(PISCES) general characters

INTRODUCTION, HABITAT AND CHARACTERS OF FISHES ARE DESCRIBED

1. Pisces – general characters G RAVITEJA LECTURER IN ZOOLOGY YVNR GDC, KAIKALUR. This Photo by Unknown Author is licensed under CC BY-SA

2. Introduction First Jawed vertebrates Completely aquatic and gill breathing animals Ostracoderms Consists most diverse and largest vertebrate group
Ichthyology Paedocypris progenetica (7.9mm) Rhynodon typhus (whale shark) This Photo by Unknown Author is licensed under CC BY-SA

3. Pisces - general characters This Photo by Unknown Author is licensed under CC BY-SA

4. Locomotion – unpaired (median and caudal) and paired (pectoral and pelvic) fins. Mouth is ventral and terminal Teeth are acrodont homodont and polyphyodont Pisces - general characters This Photo by Unknown Author is licensed under CC BY-SA

5. Pisces - general characters Exchange of respiratory gases - gills

6. Heart is two chambered – branchial and venous heart. Single circuit circulation. Pisces - general characters

7. Pisces - general characters Kidney are mesonephric Mostly ammonotelic and some are ureotelic. Cranial nerves are 10 pairs. Menix primitiva.

8. Internal ear consists of three semicircular canals. Lateral line sensory system – Neuromast organs – Rheoreceptor . Pisces - general characters

9. Eyes are without eyelids – Nictitating membrane. Unisexuals Fertilization is internal or external Development may be direct or indirect. Pisces - general characters