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FISH
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FISH

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  1. FISH

  2. Phylum Chordata • All chordates have for all or part of their lives: A. A notochord - Flexible rod shaped support B. A hollow dorsal nerve cord - Hollow cord that becomes spinal cord C. Gill Slits - Folds of skin D. Post Anal Tail

  3. Kingdom • Phylum • Subphylum • Class • Order • Family • Genus • Species Animalia Chordata Vertebrata Osteichthyes

  4. Class Osteichthyes A: First Dorsal Fin B: Second Dorsal Fin Dorsal fins give stability during swimming. The different sections are referred to as rays. # of rays is used in classification I: Pectoral Fin Side to side movement • Bony Fish • Scales smooth and overlapping C: Lateral Line Special line of cells connected to many sensory organs. Helps fish detect small differences in water around them. This is what allows fish to make movements all together as one school. D: Caudal Fin Main function is to propel fish forward. J: Pelvic Fin Stability in swimming H/G Anus and Urogenital Pore Exit for wastes Opening for genitals K: Gill Opening L: Operculum (Gill Covering) Gills are used for the exchange of gases from the water to the fish’s blood. Class Osteichthyes only has one gill slit. M: Mouth Used to ingest food N: Nostril Used for smelling food. Probably hunt more with nose than eyes. F: Anal Fin Stability in swimming. E: Caudal Peduncle Contains muscles that help fish use its caudal fin for movement forward. O: Eye Used for sight Many fish in caves have no eyes Eyes on same side of head means they probably stay on bottom of ocean

  5. 4 types of scales Placoid Ganoid Cycloid Ctenoid

  6. Class Chondrichthyes • Cartilaginous Fishes • Sharks, Skates, Rays • Main EXTERNAL differences from bony fish: • No Operculum • Only swim forward • Rough Scales

  7. Spike (for defense) 1st Dorsal Fin 2nd Dorsal Fin snout Gill slits