Caligus rogercresseyi is a predominant parasitic problem in the salmonid industry in Chile. It mainly affects Atlantic salmon and Rainbow trout. Coho salmon is not considered susceptible due to a well-developed inflammatory response.
The life cycle of C. rogercresseyi is composed of eight stages of development, two nauplius stages I and II, an infested copepodite stage, four chalimus stages and an adult stage (young adult and mature adult).
The amount of time it takes for a louse to develop depends greatly on the temperature. Under laboratory conditions the C. rogercresseyi life cycle is completed in 45 days when the water temperature is 10°C, 32 days at 12°C and 26 days at 15°C.
The external gross findings include loss of body condition, haemorrhages, petechiae and abrasions on the surface of the body causing immunosuppression in the host.
- González, L., & Carvajal, J. (2003). Life cycle of Caligus rogercresseyi,(Copepoda: Caligidae) parasite of Chilean reared salmonids. Aquaculture, 220(1-4), 101-117.
- Revie, C. W., Gettinby, G., Treasurer, J. W., Rae, G. H., & Clark, N. (2002). Temporal, environmental and management factors influencing the epidemiological patterns of sea lice (Lepeophtheirus salmonis) infestations on farmed Atlantic salmon (Salmo salar) in Scotland. Pest Management Science: formerly Pesticide Science, 58(6), 576-584.