Towards the optimization of performance of Atlantic salmon reared at different water temperatures via the manipulation of dietary ARA/EPA ratio

摘要: Abstract In recent years, aquaculture has been facing a series of new issues, including the necessary replacement fish oil and meal because their limited supply sub-optimal water temperature conditions. Higher temperatures are increasingly encountered as result climate change related phenomena and/or practice farming species in areas with environmental characteristics outside optimal physiological range, such case Atlantic salmon (Salmo salar) Australia during summer season. Previous studies teleost have shown that when exposed at higher temperatures, had preferential increased dietary intake for arachidonic acid (20:4n − 6, ARA). This observation suggests that, given several metabolic roles ARA, its provision may play an important role adapting high temperatures. The objective this study was therefore to evaluate effects different ARA/EPA ratios juvenile affected by time exposition diet particular focus performance possible resulting modifications tissue fatty composition. showed independently from treatments, held ARA accumulation, primarily liver accumulation over time. It also combined inclusion EPA significantly improved performance, compared diets either richer or EPA. A general trend toward content n − 3 LC-PUFA lower quite clear, especially liver. Therefore, assuming trends composition could be taken clue requirements fish, n − 6 requirement (and ARA) clearly appears greater raised Protein (20 °C), concomitant lipid reduction. shows importance maximal growth salmon, particularly period year often encountered. Further specifically looking ratio on myogenesis, stress physiology immune status cultured warranted. Statement relevance Given current level aquafeed, we believe considered timely highly pertinent industry associated R&D sector.