While the term ‘’sea lice’’ is often used broadly, not all species behave the same way. Caligus lice, for instance, are better swimmers and adults can be found in the water column, whereas adult salmon lice are attached to their host fish. Problems with sea lice Lice can irreversibly impact both wild salmon and farmed salmon. The intensification of salmon aquaculture in open-net systems has created a surge in sea lice due to the increasing numbers of hosts. As sea lice have developed resistance to traditional chemical treatments, farmers have been turning to thermal and mechanical methods instead.