The objectives of this research were to evaluate the maintenance of water quality when using chitosan foam filters in water recirculation systems during the cultivation of Nile tilapia and to verify the zootechnical performance and the hepatic and branchial histopathological changes, in comparison with the use of biological filter with bioballs. Two Nile tilapia cultivation trials were carried out (trial 1: 35-L tanks; trial 2: 130-L tanks), using six individual water recirculation systems, consisting of a culture tank, decantation tank, submerged pump for recirculation, aeration and external filter. The physical and chemical parameters related to water quality were evaluated every 48 h. At the end of each trial, the fish biometrics was performed to obtain final weight, feed conversion, and survival. In trial 2, the histopathological analysis of the hepatopancreas and gills was performed and the organ index was calculated. The daily averages of the physical and chemical parameters of the water quality, the zootechnical performance of the fish, and the organ indexes of the treatments of trials 1 and 2 were compared by the t test (p ≤ 5%). There were no significant differences in final weight, feed conversion, survival, or organ indexes between treatments (p > 0.05) in relation to the two trials. It was observed that the use of the filter with chitosan foam in the water recirculation systems resulted in lower or equal concentrations of total ammonia, nitrate, and dissolved orthophosphate, and maintained the same or higher alkalinity than in tanks with bioball biological filter. It is recommended to change the chitosan foam every 30 days of cultivation. The use of water recirculation systems with treatment using filters filled with chitosan foam during the cultivation of Nile tilapia is equally effective or better than the use of a biological filter with bioballs.

这项研究的目的是评估与尼罗罗非鱼养殖过程中在循环水系统中使用壳聚糖泡沫过滤器在尼罗罗非鱼养殖期间的水质维持情况，并验证动物技术性能以及肝和分支组织病理学变化。与生物球。进行了两项尼罗罗非鱼养殖试验（试验1：35升水箱；试验2：130升水箱），使用六个单独的水循环系统，包括培养箱，析池，用于再循环，曝气和外部的潜水泵过滤。每48小时评估一次与水质有关的物理和化学参数。在每个试验结束时，都要进行鱼的生物测定以获得最终重量，饲料转化率和存活率。在审判2中，对肝胰腺和and进行组织病理学分析，并计算器官指数。通过比较试验1和试验2的水的理化参数，鱼的动物技术性能和器官指标的日平均值。吨试验（p  ≤5％）。 相对于两项试验，不同处理之间的最终重量，饲料转化率，存活率或器官指标无显着差异（p > 0.05）。观察到，在水循环系统中使用带有脱乙酰壳多糖泡沫的过滤器会导致总氨，硝酸盐和溶解的正磷酸盐的浓度更低或相等，并且与带有生物球生物过滤器的罐相比，其碱度保持相同或更高。建议每30天更换一次壳聚糖泡沫。在尼罗罗非鱼的培养过程中，使用水循环系统进行处理并使用填充有脱乙酰壳多糖泡沫的过滤器比使用带有生物球的生物过滤器同样有效或更好。