| Species | Known range | Hosts |
| Lepeophtheirus salmonis | North Atlantic and north | Specific to salmonid species e.g., Pacific affecting farms in Atlantic salmon |
| Salmo salar | Canada, USA, Japan & Europe | Pacific salmon, Onchorhynchus sp, Arctic charr Salvelinus |
| Caligus elongatus | Atlantic coast of Canada | Not host specific - found on > 80 species of fish including salmonids |
| Caligus curtus | Atlantic coast of Canada | Not host specific - occasionally found on salmonids |
| Caligus clemensi | Pacific coast of Canada, USA | Not host specific - occasionally found on salmonids |
| Caligus rogercresseyi | Pacific coast - Chile | Not host specific - found mostly on salmonids in Chile (previously C. flexispina) |
| Caligus teres | Pacific coast - Chile | Occasionally found on salmonids in Chile |
