Effect from Combinations of Yucca schidigera extract with Bacillus Strains on the Growth of White Leg Shrimp (Penaeus vannamei), Density of Vibrio sp., and on the Ammonia and Nitrite Content of Culture Water

The water quality including toxic gas parameters and Vibrio density is a serious problem in intensive shrimp culture. Yucca schidigera extract Bacillus sp. are considered as practical solution to improve the quality. aim of our study was determine effect combination spp. on total ammonia nitrogen (TAN) nitrite contents, count, growth performance white leg (Penaeus vannamei). Shrimp (PL12) were assigned seven treatments (triplicates) with yucca single strain (AY, B2Y, B3Y), consortium (ABBY), only (Y), (ABB), control treatment (C). count carried out by spread plate technique every 7 days. TAN contents determined using sodium nitroprusside, sulphanilic acid N-(1-naphthyl) ethylenediamine, respectively, at 24 hours 168 after adding strains extract. include final biomass, body weight (FBW, g), gain rate (WGR, %), survival (SR, feed conversion ratio (FCR) recorded 5 weeks. results showed that (0.073 – 0.179 ppm TAN, 0.187 0.934 nitrite, 2.552 3.038 log CFU/ml) tanks treated B3Y) or (ABB) significantly controlled compared treatments. ABBY most improved WGR, FCR, SR 0.424 ± 0.010 g, 40.202 1.510 14048.902 328.756 %, 1.100 0.040, 94.667 1.856 respectively) other Overall, concluded could (0.036 0.105 0.604 2.553 2.624 CFU/ml), reduce 46.49% FCR increase (approximately 92.73% FWB, 163.19% 93.93% FCR) P. vannamei 100 individuals/100L.