Efficacy of the treatments used for the control of Caligus rogercresseyi infecting Atlantic salmon, Salmo salar L., in a new fish‐farming location in Region XI, Chile

• Published in: Journal of Fish Diseases
• Main Authors: Bravo, S, Nuñez, M, Silva, M T
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2013
• Subjects: Atlantic salmon; Salmo salar
• Online Access: http://dx.doi.org/10.1111/jfd.12023; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjfd.12023; https://onlinelibrary.wiley.com/doi/pdf/10.1111/jfd.12023

Abstract C aligus rogercresseyi is the most important parasite affecting A tlantic salmon and rainbow trout farming in sea water in C hile. After the outbreaks of the i nfectious s almon a naemia recorded in R egion X from 2007, the salmon industry has expanded southwards to R egion XI , where 60% of A tlantic salmon in C hile is now produced. In parallel with the relocation of salmon production, sea lice infestation has also spread to R egion XI , and today C . rogercresseyi is the most serious threat to the salmon‐farming industry in this region. The results obtained through a year of monitoring between S eptember 2007 and A ugust 2008 on a farm located in the ‘ L as G uaitecas A rchipelago’ in R egion XI (44°S; 74°W) showed that treatments with emamectin benzoate and deltamethrin did not give the expected control of C aligus . Failures of the treatments were associated with the loss of sensitivity recorded for C . rogercresseyi to emamectin benzoate in R egion X . In addition, a major influence was the lack of delousing coordination measures with the neighbouring farms sharing the same area in that period.