Study links culture density and oxygen availability with the diversity of the microbiota of sea bream

Study links culture density and oxygen availability with the diversity of the microbiota of sea bream
Study links culture density and oxygen availability with the diversity of the microbiota of sea bream

Population density and oxygen availability are factors that must be taken into account and that influence the skin and intestinal microbiota of the sea bream (Sparus aurata), whose better knowledge helps to optimize production cycles in commercial aquaculture.

A study conducted by the Torre de la Sal Aquaculture Institute (IATS, CSIC) examined how these environmental elements affect the behaviour and gene expression of sea bream, as well as their implications for growth performance and health.

For six weeks, two-year-old sea breams were exposed to varying densities and oxygen levels, resulting in significant alterations in their microbiota. The researchers highlighted an increase in the bacteria Alteromonas and Massilia in fish kept in high-density conditions, changes that correlated with modifications in behaviour and growth mechanisms. These processes are mediated by biological systems such as the liver, which is essential for detoxification and protein synthesis.

In addition, water temperature was observed to rise from 19°C to 27°C, a factor not central to the study but relevant due to its influence on oxygen solubility and the metabolic activity of fish. This variation, typical of seasonal conditions, underlines the importance of comprehensively managing environmental factors.

This study provides new insights into the need to carefully monitor density and oxygen using environmental control technologies to foster animal welfare and increase stress resistance, promoting more sustainable and efficient aquaculture. Furthermore, understanding how density and oxygenation manipulation can modify the microbiota allows farmers to adapt their practices to the challenges of climate change and improve the quality of the final product through specialized diets and the use of probiotics.

Reference:

Toxqui-Rodríguez, S.; Holhorea, P.G.; Naya-Català, F.; Calduch-Giner, J.À.; Sitjà-Bobadilla, A.; Piazzon, C.; Pérez-Sánchez, J. (2024). Differential Reshaping of Skin and Intestinal Microbiota by Stocking Density and Oxygen Availability in Farmed Gilthead Sea Bream (Sparus aurata): A Behavioral and Network-Based Integrative Approach. Microorganisms, 12, 1360. DOI: 10.3390/microorganisms12071360

 
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