1. Week 2: B. Classes of Fishes Lamprey Chondrichthyes Osteichthyes

2. 3 classes of vertebrates = jawless, cartilaginous, bony

3. Class Lamprey

4. Class Chondrichthyes = “cartilaginous fishes” cartilage only Class Osteichthyes = “bony fishes” cartilage and bone Week 3 Week 4... Jawed Vertebrates

5. Class Lamprey = “jawless fishes” Week 2 Jawless Vertebrates vertebrae skeleton cartilage no bone no jaws no paired fins

6. Lamprey ~40 species

7. Class Lamprey freshwater & marine

8. fossil lamprey 450 MYA MIGRATORY FW SW/FW (anadromy)

9. Adult =reproductive stage lamprey oral disk with teeth and tongue (keratin)

10. fluid-feeding

12. brook lamprey sea lamprey not all lamprey feed as adults...

13. Lamprey Life Cycle ammocoete larva to adult “ammocoetes”

14. Ammocoete Larva =non-reproductive stage filter feeder

15. adultlarva metamorphosis

16. Larval =non-reproductive feeding stage ~1/2 m Adult =reproductive non-feeding stage

18. reproductive adults ready to spawn

19. adults build gravel nests in freshwater streams

20. mating egg-laying = oviparity external fertilization death = semelparity

21. Lamprey Life Cycle ammocoete larva to adult “ammocoetes”

22. M = metamorphosis Life History Strategy #1

23. feeding phase Life History Strategy #2 M2 M1 M = metamorphosis

24. Feeding Adult Migration downstream out to sea (lake) ~3 ft ~40 lbs/fish fluid/yr.

25. B = birth R = reproduction G = growth Migratory strategies

26. non-feeding adult feeding adult larger more eggs iteroparous

27. oral disk digestive tract Development

28. predator vs. parasite

29. Species Interactions Species 1 Species 2 PREDATION Predator-Prey + – Parasite-Host +– Parasitoid-Host +– COMPETITION – – MUTUALISM ++ COMMENSALISM + 0

30. east coast native fish

31. New Hampshire 12 th Annual Lamprey Appreciation Day Saturday, June, 2010 Amoskeag Fishways Dam Merrimack River Manchester 1700s “Derryfield Beef”