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  • 1. Sharks Read pages 155-159 & 174-177 See also:
  • 2. Types of Fishes – Where Do Sharks Fit In?
    • Three types: Jawless, Cartilaginous, & Bony
    • Sharks fall into the Cartilaginous category
      • Primitive fishes
      • No true bones, only cartilage
      • Related to skates and rays
      • Most are harmless
      • See the model in C114
  • 3. Shark Diversity
    • The smallest shark is a deepwater dogfish (adults are about 8 inches long) 
    • The largest shark is the whale shark
    • (a planktivore) 
    • The fastest shark is the shortfin mako (swims up to 20 mph)
    • (Note: Average person swims about 3 mph)
  • 4. Shark Bodies
    • Notice that sharks are fish and obtain oxygen from the water through their gills-usually 5 – 7 gills
  • 5. Shark Bodies Cont.
    • Lost teeth are replaced in a “conveyor belt” system, with back teeth moving forward to replace lost ones
  • 6. Shark Bodies Cont.
    • Placoid Scales – sharp-edged scales can injure prey; gives shark skin a sandpaper-like feel
    • Liver – very fatty; helps shark maintain buoyancy
    • Tail-upper lobe is usually longer for better power & thrust
    • Usually two dorsal fins, paired pectoral fins
  • 7. Shark Reproduction
    • Fertilization is internal
    • Males use claspers to insert sperm into female’s cloaca
  • 8. Shark Reproduction Cont.
    • Some sharks are Oviparous (lay an egg-mermaids’ purse)
    • Some sharks are Ovoviviparous (have an egg that develops inside female-sometimes eating siblings!)
    • Rarely, sharks can be Viviparous (Live-bearers-like mammals)
  • 9. Shark Camouflage
    • Countershading – darker on dorsal surface to blend with the deeper water or the sea bottom & lighter on ventral surface to blend with lighter colored surface waters, making it difficult for both predators & prey to see a shark
  • 10. Shark Trouble
    • Most sharks need to force water over gills to breathe, and can “drown” when trapped in nets
    • Skin, oil, and fins are overharvested to the point of near extinction for some species
    • PSA aimed at stopping these practices: http:// =fkxoRPv4ugE&playnext=1&list=PLB4E6B7A755C66293
  • 11. Additional Shark Links
    • More on the importance of sharks in healthy oceans:
    • Clearinghouse of all known Shark links:
    • More general shark information: http:// =xVKrwsXvC0A&feature= autoplay&list =PLB4E6B7A755C66293&index=5&playnext=2