Phylum Chordata: Fishes

1. Phylum C hordata

2. C haracteristics Hollow nerve chord Notochord Gill slits/Pharyngeal pouches Digestive tube Post anal tail

3. Group of Vertebrates Fishes Amphibians Reptiles Birds Mammal

4. Fishes Water dwelling vertebrates that may have scales, fins and throats with gill slits. Close circulatory system. Contains tube like kidneys. Most species have separate males and females. External fertilization.

5. Classes of Fish Class Agnathostomata (Lampreys and Hagfishes) Class Chondrichthyes (Shark, Rays, and Skates) Class Osteichthyes (Tuna, Carp, Salmons, Stugeons )

6. Class Agnathostomata

7. Characteristics Absence of jaws Lack paired fins (Pelvic and pectoral) Skeleton made of cartilage Round eel-like body with a compressed caudal fin

8. Characteristics Soft skin devoid of scales Lack swim bladders and gill covers (Operculum) Two chambered heart Lateral lines No external ears and eyelids instead Otoliths External Fertilization Oviparous

9. Class Chondrichthyes Carcharadon carcharias Great white sharks swim constantly with their mouth slightly open to allow water to pass in and out through their gills. Source : http ://channel.nationalgeographic.com/

10.   The manta ray is the largest ray and one of the five largest species of fish in the world. Manta is a Spanish word meaning “blanket.”

11. Characteristics Skeleton made of cartilage Body covered with triangular placoid scales Ventral subterminal mouth with several rows of triangular teeth.

12. Characteristics Internal fertilization Ovoviviparous Two chambered heart No external ears and eyelids

13. Class Osteichthyes Yellow Fin Tuna

14. White Sturgeon

15. Carp

16. Salmon

17. Characteristics Skeleton made of bones Lateral lines Two chambered heart Operculum covering the gills Swim bladder

18. Characteristics Paired fins made of rays and spines or lobed fins lacking the rays and spines. Various types of scales ( ctenoid , ganoid, cycloid) External fertilization Spawning and oviparous No external ears and eyelids