A feed composition for fish comprising conventional feed ingredients such as proteins, lipids, vitamins, carbohydrates and minerals, and the use of the feed composition as well as to a method for feeding of fish which are susceptible to Cardiomyopathy syndrome (CMS), Hepatic stenosis associated with CMS and/or to diseases caused by the Piscine Myocarditis Virus (PMCV) are described. The feed is characterised by having more than 20% of the fatty acids as (n-3) fatty acids.
