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Exploring Fish Basics: From Agnathans to Sharks and Rays

Dive into the fascinating world of fish biology with this comprehensive overview. Learn about the fundamental classifications of fish, including Agnathans (like lampreys and hagfish) with their unique characteristics, and the cartilaginous Chondrichthyes group, which includes sharks and rays. Understand their anatomy, such as the external gill slits and the lack of swim bladders, and discover reproduction methods, including internal fertilization and egg-laying. This foundational knowledge sets the stage for deeper exploration into aquatic life.

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Exploring Fish Basics: From Agnathans to Sharks and Rays

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Presentation Transcript

  1. AS Warm-Up Begin work on “What’s in a Name?” (on demo table)

  2. Fish Basics • Kingdom • Phylum • 3 classes

  3. Agnathans • Lampreys, hagfish • Long, cylindrical bodies • Round mouth, ring of hooks or teeth

  4. Chondrichthyes • Sharks and rays • Skeleton is cartilage • Mouth on underside of body • Lateral line well-developed

  5. Mouth picture

  6. Dogs kill more people each year than sharks do!

  7. Shark Gills • External gill slits • 5-7 pairs of gills • Don’t pump – water passes over

  8. Sharks have no swim bladder… • Must swim constantly (pelagic), or… • Bottom-dwellers (benthic) • Spiracles

  9. Shark Reproduction • Internal fertilization • Live-bearing – placental and non-placental • Egg-laying • Mermaid’s purse

  10. Rays • Generally benthic • Wide and flat • Enlarged pectoral fins • Some elongated, stinging tails

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