Parasites

Question 1

What is a parasite

Answer 1

Symbiont dependent on host, but negative effect on host

Question 2

Ecto and endo parasites

Answer 2

Ecto live on outside

Endo are internal

Question 3

Direct and indirect life cycle

Answer 3

Direct life cycle has a single host

Indirect has one or more intermediate hosts

Question 4

Cestoda (tapeworm) life cycle

Answer 4

Eggs hatch free larvae

Eaten by small crustacean (copepod) the primary host

Manipulate behaviour to increase odds of eaten by fish (secondary host)

Crawls from güt of fish into coelom where it turns into adult

Modify fish behaviour to swim and surface and get eaten by bird

Bird is definitive host where multiple parasites combine and reproduce

Bird poops larvae

Question 5

Salmon louse

Answer 5

Ecto parasite copepod that feed on skin and mucous

attach to wild migrating salmon