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Unformatted text preview: • they are born to swim • they have a brain and senses • they breathe underwater • they reproduce by external fertilization. Born to Swim Fish use fins to steer, stop, and balance. They have 5 sets of fins: pectoral fins- pair just behind gills pelvic fins- pair below dorsal fin- one on top anal fin- one towards the rear tail fin (caudal) - one large fin at the end Brain and Senses All fishes have the sense of vision, hearing, and smell. Most have a lateral line system. lateral line- row of tiny sense organs that detect water vibrations. Breathe Underwater use gills gill- organ in which oxygen from the water is exchanged with carbon dioxide from the blood. 2 Fish Reproduction Most fishes reproduce by external reproduction. The female lays unfertilized eggs in the water. The male drops sperm on them. Some fish reproduce with internal fertilization. Some lay fertilized eggs. Some have the embryos develop inside the female. 3...
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- Fall '10
- Biology, Fish anatomy, lateral line, lays unfertilized eggs