In the spring following the migration into fresh water, a male and a female dig a nest. In the spawning act, the female attaches herself to a rock and the male fastens its sucker on the head of the female and coils around the female. The two then vibrate and eggs and sperms are released (Ref. 27547). Males spawn with more than one female in different nests (Ref. 1998). Adults die 1-14 days after spawning (Ref. 1998). Larvae remain buried in the stream bottom for up to 5 or 6 years and return to the sea after changing into the adult form (Ref. 1998). The parasitic adults spend 12-20 months in the sea before moving upstream to spawn (Ref. 1998).
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