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7th Grade Ch. 3 Sec. 2 Fishes
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7th Grade Ch. 3 Sec. 2 Fishes


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  • 1. Ch. 3 Sec. 2 Fishes
  • 2. Fish Pictures
    • Fins
    • Gills
    • Scales
    • Ectothermic
    • Live in water
    • Vertebrates
    • Have tail fin
    • Lay eggs (sexual reproduction)
    • Some-camouflage
  • 3.  
  • 4.  
  • 5.  
  • 6. fish
    • ectothermic
    • vertebrate
    • live in water
    • use fins to move
    YouTube video-Bill Nye Fish song
  • 7. fish
    • obtain oxygen thru. gills
    • have scales
    • most have external fertilization
    • 2 chambered heart
    YouTube video-Bill Nye Fish song
  • 8. Most fishes have external fertilization. In external fertilization, the eggs are fertilized outside the female’s body. The male hovers close to the female and spreads a cloud of sperm cells over the eggs she releases. The young develop outside the female’s body.
  • 9. Sharks & guppies have internal fertilization.
  • 10.
    • Fish use air, but they do it in a different way than land animals.
    • Fish pull water into their mouths and then pump the water over their gills .
    • Their gills absorb oxygen from the water into gill membranes, then the oxygen passes into the fishes' blood stream.
  • 11.  
  • 12.
    •   Most fish movements are related
    • to obtaining food.
  • 13. 3 major groups of fish jawless fishes cartilaginous fishes bony fishes classified by: structure of mouth & type of skeleton
  • 14. jawless fishes do not have jaws or scales skeletons made of cartilage 2 kinds : hagfish lamprey
  • 15. hagfish
  • 16. Lamprey
  • 17. Lamprey
  • 18.  
  • 19. Lamprey on host
  • 20. skate cartilaginous fishes skeleton made of cartilage examples : shark ray skate
  • 21.  
  • 22. A shark’s mouth contains jagged rows of teeth arranged in rows. Most sharks use only the first couple of rows for feeding- the remaining rows are replacements. If a shark loses a front-row tooth, a tooth behind it moves up to replace it.
  • 23. Sharks spend most of their time hunting for food. They will attack and eat nearly anything that smells like food. Because they see poorly, sometimes they swallow strange objects. One shark was found to have a raincoat, three overcoats, and a license plate in its stomach !
  • 24.  
  • 25. brainpop -shark attacks
  • 26.
    • Bethany Hamilton, 14, was an accomplished junior surfer who returned to the sport just a month after being attacked by a tiger shark and losing her left arm.
    WOW !
  • 27.  
  • 28. A shark can go through thousands of teeth in its lifetime. Did you know?
  • 29.  
  • 30. ray
  • 31. bony fish skeletons made of bone make up 95% of all fish species (over 20,000 species) swim bladder = air filled sac that helps them float examples: eel trout goldfish
  • 32.  
  • 33.  
  • 34.  
  • 35.  
  • 36.  
  • 37. Do fish float in water?
    • Some do, some don't.
    • Most species of fish have a 'swim bladder' - an air-filled sac inside their bodies, which makes them float. These fish use their swim bladders to stay at one level. That way, they don't have to use much energy to stay in one place.
    • They can change level by swimming or by adding or
    • removing air from the bladder. Other fish, such as
    • sharks, sink to the bottom if they stop swimming.  
  • 38.
    • Bony fish have swim bladders (balloons) that allow them to hover motionless - like an airship or blimp.
    • Most sharks cannot pump water over their gills. They rely on swimming or currents to keep water moving over their gills.
  • 39. Bony fish