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Petromyzontidae (lampreys)

Petromyzontidae (lampreys). Jawless 7 gill apertures No paired fins (pectoral, pelvic anal) Cartilaginous skeleton. American brook lamprey ( Lampetra appendix ). Petromyzontidae. Adults usually fish predator/parasites Sea lamprey adversely affected Great Lakes fishery

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Petromyzontidae (lampreys)

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  1. Petromyzontidae (lampreys) • Jawless • 7 gill apertures • No paired fins (pectoral, pelvic anal) • Cartilaginous skeleton American brook lamprey (Lampetra appendix)

  2. Petromyzontidae • Adults usually fish predator/parasites • Sea lamprey adversely affected Great Lakes fishery • Ammocoetes (eyeless, no buccal disk) eat organic matter in sediments Sea lamprey (Petromyzon marinus)

  3. Acipenseridae(sturgeons) • Large size • Subterminal mouth • Shovellike • Barbels • Bony plates on body (few scales) • Heterocercal caudal fin

  4. Acipenseridae • Benthic feeders • Many species threatened • Overharvesting • Habitat degradation • Long generation time • Eggs used for caviar Shovelnose sturgeon (Scaphirhynchus platorynchus)

  5. Polyodontidae(paddlefishes) • Large size • Long, paddlelike snout • Smooth skin (no scales or plates) • Heterocercal caudal fin • Skeleton mostly cartilaginous Paddlefish (Polyodon spathula)

  6. Polyodontidae(paddlefishes) • Planktivorous • Paddle a sensory device? • Numbers greatly reduced • Good food quality • Long generation time

  7. Lepisosteidae(gars) • Cylindrical body • Long jaws with teeth • Body covered with ganoid scales • Caudal fin modified heterocercal type

  8. Lepisosteidae(gars) • Piscivorous; ambush predators • Inhabit vegetated areas • Eggs toxic to homeotherms • Commercially unimportant Longnose gar (Lepisosteus osseus)

  9. Amiidae (bowfins) • Cylindrical body; up to 0.6 m long • Terminal mouth • Cycloid scales • Long dorsal fin • Black spot at base of caudal fin • Caudal fin modified heterocercal type Bowfin (Amia calva)

  10. Amiidae (bowfins) • Preys on variety of aquatic animals • Inhabits wetlands and backwaters of rivers • Lunglike gas bladder • Unpalatable flesh

  11. Bowfin cruising

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