Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish.
Silver lamprey
The silver lamprey ("Ichthyomyzon unicuspis") is a lamprey commonly found in the Northern and Central United States, as well as a large part of southern Canada. Its binomial name means "fish to suck" in Greek and "one point" in Latin. The silver lamprey is a member of the Class Agnatha, sometimes referred to as cyclostomes (round-mouths). Other common names include: Bloodsucker, Blue Lamprey, Hitch-hiker, Lamper, Lamprey Eel. The silver lamprey should not to be confused with the sea lamprey ("Petromyzon marinus"), which has caused considerable damage to native fish populations in the Great Lakes region.