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Jawless Fish - Evolution and Adaptation of Lampreys and Hagfish

Explore the fascinating world of jawless fish, including lampreys and hagfish, which have unique characteristics such as a cartilage skeleton and external gill pouches. Learn about their predatory behavior and scavenging habits, and how they played a role in vertebrate evolution. Discover the impact of sea lampreys on the Great Lakes ecosystem and their adaptation to different environments.

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Jawless Fish - Evolution and Adaptation of Lampreys and Hagfish

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  1. Phylum Chordata Subphylum Vertebrata Class Agnatha lamprey eels and hagfish

  2. Characteristics a) without a jaw ( “agnatha” – jawless ) b) skeleton of cartilage with cartilage vertebra c) external gill pouches/ slits

  3. Ventral, jawless mouth External gill pouches Lamprey eel

  4. Lampreys mouth I luv you

  5. Lampreys a) live in lakes and the ocean b) larvae are filter feeders in the mud for several years

  6. Lampreys are predators on large game fish – bass, trout

  7. External Fertilization

  8. “stone sucker”

  9. Hagfish - scavengers

  10. Hagfish - scavengers

  11. Hagfish secrete slime when disturbed

  12. Jawless, bony plated Ostracoderm fish Ordovocian Period 505 mya Paleozoic Scavengers/ filter feeders

  13. Early ostracoderms provided the blueprint for subsequent vertebrate evolution Silurian jawed fish with bony plates

  14. Sea Lamprey are found throughout the Great Lakes and clear, cold streams in the region. Construction and improvements on the Erie and Welland Canal (between Lake Ontario and Lake Erie) around 1921 allowed sea lampreys to get through the canal to the next lake.

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