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http://www.youtube.com/watch? v=kgZRZmEc9j4 1. 2. 3. 4. 5. 6. 7. 8. Bilateral symmetry External segmentation Coelom Notochord (vertebral column) Dorsal nerve cord (spinal cord) Gill slits at some point in development Tail at some stage of development Complete digestive system Jawless 1. 2. 3. 4. 5. 6. 7. fishes No scales Eel like body Cartilage notochord No jaw: sucker mouth or biting mouth Simple circulatory system Pore like gills Sense organs: taste, hearing, smell, sight (poorly developed) Hagfishes http://www.youtube.com/watch?v=bqk0mnMgwUQ Feed on dead or dying animals (scavengers) Almost completely blind (sense of smell helps them hunt) Hermaphrodites but only one sex develops Create the most slime of any of the fishes http://www.youtube.com/watch?v=lZq4Dme7wi4 Lampreys http://www.youtube.com/watch?v=haUNa9gzymk 50% are parasitic (use sucker mouth to feed off of fish) http://www.youtube.com/watch?v=EqskoRWMXbA External fertilization (spawning) Marine or freshwater Sharks, Chimaeras 1. 2. 3. 4. 5. and rays Ventral mouth with rows of teeth Endoskeleton entirely cartilage 5 to 7 pair of gills No swim bladder or lungs Separate sexes with internal fertilization Sharks and rays http://www.youtube.com/watch?v=_HaA U5HP8NQ Most are Predators Keen sense of smell Sense bioelectrical fields when hunting Internal fertilization and laying of eggs Basking Shark is a filter feeder Chimaeras http://www.youtube.com/watch?v=yCsa-YLTQVQ Ratfish http://www.youtube.com/watch?v=yCsa-YLTQVQ rabbit fish Spook fish http://www.youtube.com/watch?v=Zoygy-8PTtU Ghost fish Bony skeleton 2 dorsal fins Gills and gill arches Swim bladder True scales External fertilization (spawning) http://www.youtube.com/watch?v=9_TqdcSE5eY Ray-finned fishes The fish we are familiar with Largest class: 96% of all fish Goldfish, carp, trout, bass, salmon, clownfish, Lion Fish The puffer fish uses air to expand its body to look intimidating to predtators Fugu (Japan): Despite precise preparation by specially qualified chefs, this toxic puffer fish delicacy kills about 300 people per year. The emperor of Japan isn't allowed to eat fugu lest it be his last meal. For all that work and risk, it still tastes like fish, but you have to respect the chefs: To prove their skills, they must cook and eat their own fugu. http://www.youtube.com/watch?v=JNcfhPG1Svo http://www.youtube.com/watch?v=MsHCqrrU-Gk Lobe-finned fishes: Lung fish and coelachanths Ancestors of terrestrial animals Have jaws Can survive in oxygen-poor water because they take air into their lungs and through their gills http://www.youtube.com/watch?v=tqWciuuKn3c