Life Cycle
The adult lays eggs within the vertebrate host. The vertebrate passes out the eggs in its feces. The first larval stage, the miracidia, develop within the eggs, hatch, and swim away. The miracidia then penetrate the first intermediate host, the Oxytrema silicula stream snail. After further development in the stream snail, N. salmincola larva develop into rediae, which give rise to cercariae. The cercariae emerge from the snail and penetrate the second intermediate host, the salmonid (some non-salmonid) fish. The parasites develop into metacercaria and encyst within the kidneys, muscles, and fins of the salmonid fish. The parasites enter its final host, including canids and humans, upon ingestion of the infected fish, and develop into adult worms that produce eggs to be passed in the host’s feces.
Read more about this topic: Nanophyetus Salmincola
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