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Fishing WisconsinBlack spot disease

Black spot, is a parasite of fish. This parasite has a life cycle that uses birds, snails and fish as the host animal. The adult parasite lives in the bird and sheds eggs that pass into the water. The parasite eggs hatch and infect snails. Larvae develop in the snail and then swim out from the snail into the water. When they find a fish, the larvae burrow into the skin or muscle of the fish and stop their development. When a bird eats an infected fish, the larvae develops into an adult parasite in the bird and the cycle begins again. The black spot parasite uses the kingfisher or gull as the host bird.

Cooking kills the parasites and they cannot infect people in any case.

Blackspot parasite

Black spot parasite - Neascus spp.
Minnesota DNR Photo

Last revised: Monday April 06 2015