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Sea lice are natural parasites of wild salmonids (salmon and trout) in salt water, feeding on their mucus, skin, and blood.
Intensive aquaculture of rainbow trout and other salmonids is a relatively new innovation, compared to the cultivation of most other animals.
In addition to the normal spectrum perceived by most vertebrates, several shallow-water species are able to see ultraviolet light; others, such as anchovies, cyprinids, salmonids and cichlids, can even detect polarized light!
Larger and deeper lakes, with oxygenated hypolimnions, will also have one or two larger salmonids , usually lake trout or landlocked Atlantic salmon, along with burbot and slimy sculpin.
Of all salmonids , namely the salmon and trout, S. confluentus is more inclined to feed on fish.
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