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首页> 外文期刊>Indian Journal of Fisheries >Biofilm formed on different natural substrates enhances the growth and survival in Macrobrachium rosenbergii (de Man, 1879) juveniles
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Biofilm formed on different natural substrates enhances the growth and survival in Macrobrachium rosenbergii (de Man, 1879) juveniles

机译：在不同的天然底物上形成的生物膜增强了大鼠大孢菌罗森伯格（De Man，1879）少年的生长和存活

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An experiment of 65 days duration was conducted to study the effect of biofilm formed on different natural substrates at different substratum densities on the growth and survival of juveniles of freshwater prawn Macrobrachium rosenbergii (de Man, 1879). Natural substrates like dried paddy straw and cut grass were evaluated as substratum for biofilm production. The experiment was conducted in fiber glass tanks of 500 l capacity. The study comprised six treatments viz., dried paddy straw at 60 (T1); 120 (T2) and 240 (T3) g tank(-1) and cut grass at 60 (T4) and 120 (T5) g tank(-1), each with three replicates following a completely randomised design. Prawn juveniles reared without any substratum acted as control. Ten days after the introduction of substratum in the tanks, prawn juveniles (2.01 g +/- 0.37) were stocked at a density of 40 m(-3). The juveniles were fed with 2 mm commercial pellet feed (30% protein) at 5% of the biomass. No water exchange was done in the treatment tanks whereas in control tanks 50% water exchange was done once every week. The study revealed significantly (p0.05) higher survival rate (%) in the treatment tanks (94.4 +/- 9.6, 80.5 +/- 12.7, 86.1 +/- 12.7, 86.1 +/- 4.8 and 91.6 +/- 8.35 for treatments T1, T2, T3, T4 and T5 respectively) compared to the control (52.8 +/- 9.5). Among treatment tanks, T2 and T3 showed significantly higher (p0.05) average daily growth (g d(-1)) (0.055 +/- 0.005 and 0.057 +/- 0.005 respectively) when compared to other treatments (0.0367 +/- 0.02 for T1 and 0.0373 +/- 0.01 for T5). But the specific growth rate did not show any significant difference among the treated groups including control. Use of biofilm significantly reduced the usage of water (by 2.9 times) compared to control, which is significant considering the predicted water scarcity in future.
机译：进行了65天持续时间的实验，以研究生物膜在不同的外水性底物上形成的生物膜对淡水虾Macrobrachium Rosenbergii（De Man，1879）的生长和存活的影响。像干燥水稻秸秆和切割草一样的天然基材被评价为生物膜生产的底层。实验是在500μl容量的纤维玻璃罐中进行的。该研究包括六种处理，干燥的水稻秸秆在60（T1）; 120（T2）和240（T3）G罐（-1）和60（T4）和120（T5）G罐（-1）的剪切草，每个含有三种复制，在完全随机的设计之后。虾青少年没有饲养没有任何碱的作用。在罐中引入底皮后十天，虾幼绒（2.01g +/- 0.37）的密度为40 m（-3）。用2mm的商业颗粒饲料（30％蛋白）在5％的生物质中喂食幼年。在治疗罐中没有进行水交换，而在控制罐中每周使用50％的水交换。该研究显着揭示了治疗罐中的存活率（P <0.05）的较高（P <0.05）（94.4 +/- 9.6,80.5 +/- 12.7,86.1 +/- 4.8和91.6 +/- 8.35与对照（52.8 +/- 9.5）相比，分别处理T1，T2，T3，T4和T5。在处理罐中，与其他治疗相比，T2和T3显着更高（P <0.05）平均每日生长（分别为0.055 +/- 0.005和0.057 +/- 0.005）（0.0367 +/- 0.02对于T1和T5的T1和0.0373 +/- 0.01）。但具体的生长速度没有显示治疗组中的任何显着差异，包括控制。与对照相比，使用生物膜的使用显着降低了水的使用（2.9次），这是考虑到预测的未来水资源稀缺性的重要性。

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