WWW.WAS.ORG • WORLD AQUACULTURE • DECEMBER 2025 57 incorporated directly into feed. No extra labor. No bath treatments. Just a daily dietary defense against some of the most dangerous bacterial threats. Of course, more research is needed. We are planning larger-scale trials to confirm these results in commercial settings, and we are also interested in exploring how these compounds affect fish immunity and gut health over longer periods. There is also potential to test alternative challenge methods, such as immersion or cohabitation, which may be more effective in some production systems. Moreover, future efforts will focus on evaluating the effects of these OSCs against other bacterial pathogens and in additional culture species to better understand their broad applicability in aquaculture. Still, the outlook is promising. If onions can help keep seabass healthy — and reduce our dependence on antibiotics in the process — we may be peeling back a new layer of sustainable innovation in aquaculture. Funding & Acknowledgements This research was carried out at the Andalusian Aquaculture Technology Centre (CTAQUA) with the collaboration and technical support of the DOMCA R&D team. It was funded by the FISHEALTH project (CER-20211010), supported by the Centre for the Development of Industrial Technology (CDTI) under the CERVERA Program for Technological Centres of Excellence. Notes Jose F. Cabello-Gómez*, Iria Folgueira López, Carmen García de Lomas del Cid, María del Mar Agraso Martínez, Fundación Centro Tecnológico Acuicultura de Andalucía, Muelle Comercial S/N - “Edificio CTAQUA”, 11500 El Puerto de Santa María, Cádiz, Spain, and Alberto Baños Arjona, DOMCA, S.A.U., Camino de Jayena 82, 18620 Alhendín, Granada, Spain. * Corresponding author: j.cabello@ctaqua.es FIGURE 3. We began with a series of in vitro tests, applying standard microbiological techniques. FIGURE 2. All trials were conducted at the Andalusian Aquaculture Technology Centre (CTAQUA, Spain), with the technical support of DOMCA S.A.U.’s R&D team. FIGURE 4. PTSO in particular showed potent bactericidal activity, especially against T. maritimum and V. anguillarum. FIGURE 5. Fish fed the supplemented diets had significantly higher survival rates. While the control group ended the trial with a 48.75% survival probability, fish receiving 150 ppm and 300 ppm of the PTS/PTSO blend reached 62.5% and 61.25% respectively. Still, the outlook is promising. If onions can help keep seabass healthy—and reduce our dependence on antibiotics in the process—we may be peeling back a new layer of sustainable innovation in aquaculture.
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