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Fish

Fish. Characteristics of Fishes. Vertebrate- Ectotherm(Cold-blooded) Obtains oxygen from the water by gills Has a closed circulatory system THINK!- What is loop by which blood travels? Heart  Gills  Body  Back to the heart Uses fins to move

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Fish

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  1. Fish

  2. Characteristics of Fishes • Vertebrate- Ectotherm(Cold-blooded) • Obtains oxygen from the water by gills • Has a closed circulatory system • THINK!- What is loop by which blood travels? • Heart  Gills  Body  Back to the heart • Uses fins to move • Reproduce by external fertilization (eggs are fertilized outside the body)

  3. Jawless Fishes • Examples: Lampreys & Hagfishes • Characteristics: • No jaws or scales • Instead of jaws, they have structures for scraping, stabbing, and sucking their food • Their skeleton is made up of cartilage • THINK! – Which is more flexible: bone or cartilage? • Cartilage

  4. Cartilaginous Fishes • Examples: Sharks, rays, and skates • Characteristics: • Have jaws and scales • Skeletons made of cartilage • They are carnivores • Skates & rays hunt for food on the ocean floor • Sharks will attack anything that smells like food • Sharks can smell 1 drop of blood in 115 liters of water • United Streaming: Sharks (4:14)

  5. Bony Fishes Bluefish • Examples: Trout, tuna, goldfish, clownfish, balloonfish • Characteristics: • Makes up 95% of all fishes. Take a look at the fish you can catch in NJ pictured to the right. • Has jaws, scales, and gills on each side • Has a skeleton made of hard bone • Has an organ called a swim bladder • THINK! – What does this organ do for the fish? • A Gas filled sac that helps the fish stay stable at different water depths (acts like a life vest). Sea Robin Fluke

  6. Color Coding a Bony Fish(Color the fish according to the colors shown below.)

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