Physiological Responses of European Seabass (Dicentrarchus labrax) Juveniles to Long-Term Feeding with Increasing Levels of EPA and DHA: Effects of Thermal Challenge
Oct 2026· Animals· Vol 16, pp. 3119· 0 citations· 83 references
Medicine
TL;DR
This study assessed the long-term impact of graded levels of dietary EPA+DHA from microalgal oil on European seabass growth, feed utilization, immunological and oxidative status, and muscle FA profile, and linear correlations were observed between muscle and dietary n-3 LC-PUFA levels.
Abstract
Simple Summary Fish oil is an important source of omega-3 fatty acids (FAs) in aquaculture but is increasingly being replaced by alternative oils. Since carnivorous fish need EPA and DHA for normal development and health, identifying suitable dietary levels is essential. In this study, European seabass were fed diets containing increasing levels of EPA+DHA for 180 days. Fish performance, feed efficiency, immune function, and oxidative status were not affected by the dietary treatments. The FA composition of fillets reflected that of the diets. Fish were then exposed to a 7-day thermal challenge at 30 °C. Although this challenge increased immune and oxidative responses, no mortality occurred, and fillet EPA+DHA levels were maintained, indicating that exposure to 30 °C did not compromise fillet EPA and DHA content.
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Balancing dietary
n
−3 long-chain polyunsaturated fatty acids (LC-PUFAs) is essential for optimizing growth and disease resilience in Atlantic salmon and will become an increasing challenge when implementing novel sources of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), such as genetically modified (G...
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