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Water quality and nitrogen budget in turbot Scophthalmus maximus culture system supplemented with lactic acid bacteria
- Ren, Yichao, Guo, Guangxin, Zhou, Shun, Li, Chao
- Aquaculture research 2019 v.50 no.10 pp. 2743-2750
- Scophthalmus maximus, ammonium nitrogen, animal growth, denitrification, diet, drainage, fish culture, fish feeds, fish products, lactic acid bacteria, nitrate nitrogen, nitrite nitrogen, nitrogen, nutrient utilization, probiotics, turbot, water quality
- To understand the nutrient utilization efficiency and distribution in indoor fish culture system under treatment of probiotics, this study examined water quality and nitrogen budget in turbot Scophthalmus maximus culture system supplemented with four strains of lactic acid bacteria (LAB) isolated from fishery products. The results showed that the concentration of ammonia nitrogen (NH₃‐N) and nitrite nitrogen (NO₂‐N) in LAB treatments were all significantly lower (p < 0.05) than in the control group. The nitrate nitrogen (NO₃‐N) in LAB treatments showed no significant differences (p > 0.05) compared with control group. The fish feed and water exchange accounted for 79.07% and 17.02% of total N input respectively. For N output, the drainage and residual diets in LAB treatment accounted for 24.50%–25.80% and 1.33%–1.60% respectively, and they were significantly lower than in the control group (27.60% and 2.20% respectively). Fish growth and lost N in LAB treatments accounted for 27.10%–30.50% and 11.00%–18.50% respectively, and they were both significantly higher (p < 0.05) than in the control group (22.30% and 5.30% respectively). The results indicated that the indigenous LAB strains were capable of improving fish growth, and reducing NH₃‐N and NO₂‐N level (at concentration of 10⁵ cfu/ml) by directly adding in S. maximus culture water. Moreover, specific strains of LAB may increase nitrogen loss by promoting denitrification process in culture system.