“…For this reason, many recent aquaculture studies have focused on the search for organic‐based antimicrobial, antifungus, immunostimulant, anti‐inflammatory and stress‐relieving products that will provide maximum benefits (Asadi, Mirvaghefei, Nematollahi, Banaee & Ahmadi, ; Balamurugan et al., ; Hernández, Romero, Gonzalez‐Stegmaier & Dantagnan, ; Kirubakaran, Subramani & Michael, ). Generally, in these studies, microorganisms, plants and plant extracts, volatile oils, active substances or polysaccharides were investigated (Acar, Kesbiç, Yılmaz, Gültepe & Türker, ; Bilen, Ünal & Güvensoy, ; Güllü et al., ; Gültepe et al., ; Sönmez, Bilen, Alak et al., ). These products contain polypeptide, phenolic, polyphenolic, terponoid, quinone, lectin and alkaloid derivatives and have potential as an alternative to synthetic drugs for use in aquaculture (Citarasu, ).…”