A group of researchers from Chile and Spain has found that functional diets can help alleviate the impacts of crowding stress on farmed salmon.
The aim of their study was to evaluate the effect of yeast extract (Xanthophyllomyces dendrorhous; Diet A) and the combination of plant extracts (common Saint John\'s wort, lemon balm, and rosemary; Diet B) on the antioxidant and immune status of Atlantic salmon grown under normal cultured conditions and then subjected to crowding stress.
According to the study authors, \"fish were fed with functional diets during 30 days (12 kg/m3) and then subjected to crowding stress (20 kg/m3) for 10 days. The lipid peroxidation in gut showed that both diets induced a marked decrease on oxidative damage when fish were subjected to crowding stress.\"
Results found that functional diets protected fish against the biomolecules oxidation and promoted the expression of humoral response in fish under crowding stress.