Abstract In this study, the efficacy of biofloc system was assessed for polyculture Indian major carp, e.g., rohu (Labeo rohita), catla (Catla catla), and mrigal (Cirrihinus mrigala) cultured at varied stocking densities (STD) from 4.28, 8.57, and 12.85 fish m-3 of tank volume. Biofloc system could efficiently remove inorganic nitrogen from culture water and substantially improved the growth parameters of fishes as compared to the control system without the application of biofloc. Among different STDs in biofloc system, water quality and floc formation were noted to be higher with a STD of 4.28 fish m-3 and the average concentration of NH4 – N, NO2 – N and NO3 – N of 0.61 mg L-1, 0.35 mg L-1 and 1.8 mg L-1, respectively was recorded lowest as compared to the other STD. As a result, catla and rohu could achieve a specific growth rate of 1.1 % day-1 and 0.98 % day-1, respectively. However, in the other two STDs, the respective concentrations were noted in the range of acceptable water quality, and the growth rates were satisfactory. It can be concluded that the biofloc system is efficient to culture IMC in polyculture mode amd therefore, can be directly applied in scaled-up culture modules.

中文翻译：

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生物絮团技术在印度主要鲤鱼养殖（混养）中的应用以及水质管理

摘要 在这项研究中，评估了生物絮团系统对混养印度主要鲤鱼的功效，例如 rohu (Labeo rohita)、catla (Catla catla) 和 mrigal (Cirrihinus mrigala) 以不同的放养密度 (STD) 从 4.28、8.57 ，以及 12.85 条鱼 m-3 的水箱容积。与未使用生物絮团的对照系统相比，生物絮团系统可以有效去除养殖水中的无机氮，显着改善鱼类的生长参数。在生物絮团系统的不同 STD 中，水质和絮体形成较高，STD 为 4.28 鱼 m-3，NH4 – N、NO2 – N 和 NO3 – N 的平均浓度为 0.61 mg L-1, 0.35与其他 STD 相比，分别记录的 mg L-1 和 1.8 mg L-1 最低。因此，catla 和 rohu 可以达到 1 的特定增长率。分别为 1 % 第 1 天和 0.98 % 第 1 天。然而，在其他两个性病中，各自的浓度都在可接受的水质范围内，并且增长速度令人满意。可以得出结论，生物絮团系统在混养模式下培养 IMC 是有效的，因此可以直接应用于放大的培养模块。