Sea reared rainbow trout Oncorhynchus mykiss need fewer sea lice treatments than farmed Atlantic salmon Salmo salar

摘要

A field investigation at a marine finfish farm site which stocked both Atlantic salmon and rainbow trout was carried out over a period of 14 years. Abundance of Lepeophtheirus salmonis at this site was found to be similar on both species, however, the quantity of sea lice treatments carried out on each stock of fish show a marked difference between species, with over three times the amount of sea lice treatments being carried out on salmon to maintain the same level of sea lice control. A different management regime had to be employed for the two fish species with a higher treatment effort being implemented for the salmon stocks to maintain sea lice infestation levels within the required thresholds.