Petromyzon marinus

Phylogeny:
Class Agnatha

Metamorphosis:
Complete - See illustration

Geographical location:
Over the past 100 years, populations have succeeded in bypassing the marine stage, so that they can live their entire lives in freshwater. Adults live in deep waters of the Great Lakes, and migrate to tributaries & rivers to spawn. Ammocoete larvae live upstream for several years, and then migrate to open water, where they reach sexual maturity.

Organs affected:
Skin. Rows of numerous teeth cause severe damage to skin, thereby promoting secondary bacterial & fungal infections which can be fatal.

Numerous lamprey may be attached to the same host fish.

Invading Species Awareness PSA - Sea Lamprey

http://www.youtube.com/watch?v=x-KJZ22-wTQ

Sea lamprey spawning:

http://www.youtube.com/watch?v=dHmesdUKDUs&feature=related

Lamprey eliminator:

http://www.youtube.com/watch?v=eqoT8tcZq6k&feature=related

Path of sea lamprey through great lakes

http://dnr.wi.gov/fish/lakesup/images/image003.jpg

Treatment/control:
Larvicides are applied in small rivers and streams