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Fish…our friends in the water

Fish…our friends in the water. Porcupine Fish. Great White Shark. 20,000 species Found in all types of water i.e: Fresh, salt, sunless, polluted, warm, cold, etc. Ectothermic. External features Paired fins Scales (protection). Characteristics of Fish. Respiration. Respire using gills

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Fish…our friends in the water

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  1. Fish…our friends in the water Porcupine Fish Great White Shark

  2. 20,000 species Found in all types of water i.e: Fresh, salt, sunless, polluted, warm, cold, etc. Ectothermic External features Paired fins Scales (protection) Characteristics of Fish

  3. Respiration • Respire using gills • H2O enters mouth. • Water passes over gills • Water then passes out slits on side of fish • O2 and CO2 are exchanged through capillaries (small blood vessels) in gills

  4. Circulation • Two-chambered heart • 1-chamber received deoxygenated blood • 2nd-chamber pumps blood to gills. • Oxygen picked up and dispersed to rest of body • Carbon dioxide is released • Slow process

  5. Nervous/Reproductive System • Lateral line---mechanism that detects movements and vibrations. • Some fish can smell • Two sexes (male and female) • External fertilization

  6. 3 Sub - Classes of Fish • Jawless (Agnatha) • Cartilaginous (Chondrichthyes) • Bony (Osteichthyes)

  7. Jawless Fish • Sharp teeth used to “drill” hole in animal • Blood sucked out of hole • Endoskeleton made of cartilage • Examples: Lamprey, hagfish

  8. Cartilaginous Fish • Endoskeleton made up of cartilage • Skilled predators (typically found near floor of water source) • Examples: Sharks, rays

  9. Bony Fish • Endoskeleton made up of bones • Lateral line system (pressure change and swim with no light) • Swim bladder (allows fish to float) • Scales (reduces friction) • Majority of fish • Examples: Salmon, Trout, Catfish

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