he results revealed that the fish fed LMWSA diets enhanced the protection of tilapia, Oreochromis niloticus against S. agalactiae infection ( Fig. 6). Dead fish were observed in control group after 6 days post-challenge, while the numbers of dead fish in LMWSA administration diets were observed at 7 days post-challenge. The highest relative percent of survival (RPS) was observed in tilapia fed 10 g kg−1 LMWSA diet (T2: 85.71%) following by fish fed diets of 30 g kg−1 (T4: 78.57%) and 20 g kg−1 LMWSA (T3: 71.43%). Fish fed diet of 10 g kg−1 LMWSA showed highest resistance to S. agalactiae.