Effect of water salinity and dietary supplementation with Microchloropsis gaditana on growth, health, quality and microbiota of Barramundi Lates calcarifer

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Abstract

Background Climate change has been associated with fluctuations of environmental parameters such as salinity, which can affect growth rates, quality, and overall health of farmed organisms. Consequently, farming euryhaline fish can be a solution to build resilience of aquaculture to climate change. Euryhaline species can undergo notable physiological and behavioural changes in response to fluctuations in salinity levels and a dietary supplementation with microalgae extract has the potential to foster the salinity tolerance thanks to its antioxidant properties. Methods The trial was performed on a well-known euryhaline species, Lates calcarifer , reared at two different salinities, namely seawater (SW) and brackish water (BW), within a recirculating aquaculture system (RAS). The effect of supplementation with the microalga Microchloropsis gaditana liquid extract 3% w/v top coated on the feed, was also investigated. After ten weeks, the growth performance, the fillet quality, and the microbiome profile, were compared between four treatments (SW, SW+ M. gaditana , BW, BW+ M. gaditana) . Results The FCR and feed intake showed a significantly higher value in fish reared in SW. The viscerosomatic index (VSI) was also higher in the SW treatment compared to the BW. There were no significant differences in growth between fish fed with M. gaditana supplement and fish without algal supplementation. Moreover, there were no significant differences in body colour intensity. The fatty acid profile was also assessed for the four treatments. The algal supplementation resulted in higher MUFA and TFA, and lower SAFA of fish reared in SW compared to BW. The analysis of the microbiome showed that changes in salinity strongly influenced the community composition in faeces and system compartments. Conclusions Overall, the results of this study indicate that barramundi can be reared successfully at different salinities without experiencing significant impact on growth, and should be considered to increase resilience of the aquaculture sector in a changing environment.
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last seen: 2026-05-20T01:45:00.602351+00:00