Lepeophtheirus salmonis sealice is a natural parasite of wild and farmed seacaged Atlantic salmon Salmo salar culture within Europe. L. salmonis has a circumpolar distribution within the northern hemisphere, where infection of wild fish is generally low but in culture conditions infection rates can be very high. Infection of salmonids by L. salmonis occurs all year with a succession of generations during the year. The greatest number of parasite occur in the late summer and autumn due to an accumulation from successive generations.

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