“…Allium-species plants, mainly garlic (Allium sativum) and onion (Allium cepa), produce a wide variety of organosulfur compounds showing antifungal, antimicrobial, antioxidant, antiparasitic, and antiviral activity [15,16], and beneficial effects on the immune system [17,18]. These benefits were also observed in several studies in aquaculture, improving immune function, blood parameters, and health status in various fish species [19][20][21][22][23]. The activity of these plant compounds in animal feed is related to secondary metabolites, volatile organosulfur compounds such as ajoene, allicin, isoalliin, propyl propane thiosulfinate (PTS) or propyl propane thiosulfonate (PTSO) [23,24].…”