Abstract
This study aimed to evaluate the survival and morphological performance of Black Tiger Shrimp after immersion with Sargassum duplicatum extract as well after a Vibrio harveyi challenge. The experiment was performed in a completely randomized design with four treatments and 3 replicates each. Treatments consisted of immersions with S. Duplicatum extract (A) 600 ppm, (B) 700 ppm, (C) 800 ppm, and (D) control. Every unit contained 200 PL-4 shrimps. Shrimps were prior immersed into the extract for 15 minutes, then put into a plastic container for 7-day rearing. Survival and morphological performance (antennular, hepatopancreas, foregut, midgut, uropod, tail muscles, chromatophores, attachment, and stress) of larvae were observed at the end of the study. The challenge test was performed by an artificial infection with Vibrio harveyi. The results demonstrated no significant differences in immersion treatments on survival, yet it could indicate a non-toxic on 800 ppm of S. duplicatum for shrimp larvae. Hepatopancreas of shrimp S. duplicatum after the immersion was visibly better than not unless other observed organs that seemed no different. Further study is necessary for S. duplicatum extract in improving shrimp quality.
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