Epidemiological description of the sea lice (Caligus rogercresseyi) situation in southern Chile in August 2007
Author
dc.contributor.author
Hamilton-West Miranda, Christopher
Author
dc.contributor.author
Arriagada, Gabriel
Author
dc.contributor.author
Yatabe, Tadaishi
Author
dc.contributor.author
Valdés, Pablo
Author
dc.contributor.author
Hervé Claude, Luis Pablo
Author
dc.contributor.author
Urcelay Vicente, Santiago Patricio
Admission date
dc.date.accessioned
2018-12-20T14:53:16Z
Available date
dc.date.available
2018-12-20T14:53:16Z
Publication date
dc.date.issued
2012
Cita de ítem
dc.identifier.citation
Preventive Veterinary Medicine 104 (2012) 341–345
Identifier
dc.identifier.issn
01675877
Identifier
dc.identifier.other
10.1016/j.prevetmed.2011.12.002
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/157306
Abstract
dc.description.abstract
Salmon sea lice represent one of the most important threats to salmon farming throughout the world. Results of private monitoring efforts have shown an increase in the number of positive cages and cage-level abundance of sea lice in southern Chile since 2004. As a consequence, the Chilean Fisheries Service implemented an Official Surveillance Program in the main salmon production area of southern Chile to assess the situation of sea lice in fish farms. Results showed that the prevalence of sea lice in the fish farms was 53.4%, ranging from 3.5% in Puerto Aysen to 100% in the Seno de Reloncavi zone. The average sea lice abundance was 11.8 per fish (Geometrical mean (GM) = 8.61, 95% CI (2.1-6.9)). The highest levels were found in Seno de Reloncavi (GM = 24.99, 95% CI (15.9-39.2)), Hornopiren (GM = 14.7, 95% CI (10.4-20.8)) and Chiloe norte (GM = 9.75, 95% CI (1-1.9)), and the lowest loads were observed in Puerto Aysen (GM = 1.35, 95% CI (1-1.9)) and Puerto Cisnes (GM = 1.67, 95% CI (1.1-2.6)).
Salmo solar and Oncorhynchus mykiss had the highest abundance levels (GM = 6.93, 95% CI (5.7-8.5), and (GM = 5.55, 95% CI (3.6-8.5), respectively). O. kisutch showed lower levels (GM = 1.34, 95% CI (1-1.7)), apparently being more resistant to infestation.
Sea lice in farmed salmon are widely distributed in different zones of southern Chile, and are becoming a serious threat to this industry. Prevalence and abundance levels were found to be generally high, decreasing in southern zones.