Effects of different solid carbon sources on water quality, biofloc quality and gut microbiota of Nile tilapia (Oreochromis niloticus) larvae

By Jiawei Li, Gang Liu, Changwei Li, Yale Deng, M. A. Tadda, Lihua Lan, Songming Zhu, Dezhao Liu. Aquaculture, 2018

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Abstract External carbon source is needed for biofloc system to maintain an optimal C/N ratio for the growth of bacteria biomass. In this study, three solid-phase biodegradable compounds, including Longan powder (LP), polyhydroxybutyrate-hydroxyvalerate/LP (PHBVL) and Poly(butylene succinate)/LP (PBSL), were utilized to feed biofloc-based aquaculture systems in triplicates for nine Nile tilapia (Oreochromis niloticus) larvae culture tanks. LP was applied in the in-situ biofloc system as a “control group” (3 tanks), while PHBVL and PBSL were used in the ex-situ biofloc systems (6 tanks). During the 120-days experiment, the C/N ratio was maintained at 24.87 ± 5.66, 22.93 ± 3.20 and 23.12 ± 3.54 for the LP, PHBVL and PBSL groups, respectively. There were no significant differences (P > .05) of the averaged total ammonia nitrogen (TAN) concentration among the LP, PHBVL and PBSL groups (1.10 ± 1.18, 0.67 ± 0.38 and 1.18 ± 1.40 mg L−1). Significant differences of the averaged NO2−-N concentrations (0.26 ± 0.38, 0.01 ± 0.01 and 0.08 ± 0.12 mg L−1) were detected among the LP, PHBVL and PBSL groups (P  40 mg L−1 on day 120) was significantly higher than that of PHBVL and PBSL groups (about 2–3 mg L−1 on day 120) (P

Subfields: Aquatic Science, Global and Planetary Change, Immunology

View Paper: https://www.semanticscholar.org/paper/6d2ad15eaeaddb763738c6dc12ef0075ebf07021