Received: 18-05-2021 / Accepted: 21-02-2022
The study was conducted to evaluate the effect of dietary fucoidan extracted from brown seaweed Sargassum swartziion growth, survival rate, feed conversion ratio (FCR), and disease resistance to Aeromonas veroniibacterium in Nile tilapia (Oreochromis niloticus) fingerlings. Fish (23.2 ± 2.7g) were fed the commercial feed (35%Pr) supplemented with fucoidan at various concentrations (0%, 0.05%, 0.1%, 0.5%) in triplicate for 6 weeks. The results have showed that fucoidan did not significantly affect (P >0.05) the growth, survival, and FCR during the feeding trial. At the end of nutritional trial, fish were infected with Aeromonas veroniiat dose of LD50 (7.82 ×104CFU/ml), fish were then monitored for 10 days, the mortality was daily recorded. After 10 days of challenge, the results showed that the survival rate was 76.6% and 80% for 0.1% and 0.5% fucoidan-fed fish, respectively, much higher than other groups (30% and 36.7% for Control and 0.05% fucoidan-fed fish, respectively) (P < 0.05). In conclusion, dietary fucoidan extracted from brown seaweed Sargassum swartziiat 0.1 and 0.5% enhanced the resistance of tilapia fingerlings against to Aeromonas veronii.