Ichthyology Final Exam Review

Reproduction, Dangerous Marine Animals, and Parasitology

What is an Ectoparasite?

External parasite.

How do ectoparasites get on/in their host?

They attach or burrow into the skin.

What are some examples of ectoparasites?

Ticks, fleas, lice, mites, mosquitos, and some flies.

What is an Endoparasite?

Internal parasite.

What is an example of an Endoparasite?

Tapeworms.

Lifecycles of parasites are typically ____. Some life stages will likely be ____ to the host.

Complex, external.

What is a host?

The organism being parasitized.

What are examples of some hosts?

Fish, Marine Mammals, or Humans.

What is the parasite Anisakis?

It is a nematode that can be found in raw or undercooked fish. Adult worms are usually found in marine mammals.

What are some other names for the Anisakis?

Roundworms, cod worms, or seal worms.

What illness does Anisakis cause in humans?

Anisakiasis

Where is Anisakis found?

Global, but common in Japan or other areas where raw or marinated or pickled fish are eaten.

What are some symptoms of Anisakiasis

Severe abdominal distress. Similar symptoms to appendicitis, peptic ulcers, and food poisoning.

What is one way to get rid of the anisakis?

Freezing the fish kills the larvae.

Where are Broad fish tapeworms found?

They have a wide distribution. Most common in circumpolar regions.

What are some definitive hosts of the Broad Fish Tapeworm?

Mammals and Birds.

What is a definitive host?

A host of an adult parasite.

How long can the Broad fish Tapeworm live for in their host?

up to 25 years.

What are some symptoms of the Broad Fish Tapeworm?

Usually asymptomatic, gastrointestinal upset, rarely intestinal blockage in heavy infections.

How is a person with Broad Fish Tapeworms diagnosed?

With a fecal smear. Eggs in stool sample.

Are Broad Fish Tapeworm eggs dangerous to humans?

They are not.

Other tapeworm species can cause ____ in humans after exposure to eggs.

cysts.

What are Polylabroides Multipinosus’?

They are Marine polyopisthocotyleans that have simple and direct life cycles.

What are 3 eggs facts about the Polylabroides Multispinosus?

They continuously are deposited at night. They drift with plankton and found at sea bottom. and they hatch into oncomiracidium after 1 to several weeks.

Where do adult Polylabroides Multispinosus lives?

In gills with marginal hooklets.

Where do Ectoparasitic Flukes infect on a fish?

the Skin, fins, head, gills and oral cavities.

What are some host preference examples for the Ectoparasitic flukes?

Agnatha (hagfish), Chondrichthyes and teleosts (including sturgeon).

What is the size of Ectoparasitic Flukes?

300micrometers to more than 3centimeters.

How do adult Ectoparasitic Flukes attach to their host?

with their hooklets.

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