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

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Presentation transcript:

Week 2: B. Classes of Fishes Lamprey Chondrichthyes Osteichthyes

3 classes of vertebrates = jawless, cartilaginous, bony

Class Lamprey

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

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

Lamprey ~40 species

Class Lamprey freshwater & marine

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

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

fluid-feeding

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

Lamprey Life Cycle ammocoete larva to adult “ammocoetes”

Ammocoete Larva =non-reproductive stage filter feeder

adultlarva metamorphosis

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

reproductive adults ready to spawn

adults build gravel nests in freshwater streams

mating egg-laying = oviparity external fertilization death = semelparity

Lamprey Life Cycle ammocoete larva to adult “ammocoetes”

M = metamorphosis Life History Strategy #1

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

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

B = birth R = reproduction G = growth Migratory strategies

non-feeding adult feeding adult larger more eggs iteroparous

oral disk digestive tract Development

predator vs. parasite

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

east coast native fish

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