Split ponds are earthen ponds divided into two sections: a small fish-confinement basin and a larger water-treatment basin. Water is circulated between the two basins using a high-volume pump. Although split ponds have proven their potential to increase the productivity of earthen catfish ponds, various pumping systems have been used in commercial settings. Choice of the best pumping system requires systematic verification of production and economic performance at commercial scale. In this study, we evaluated four commercial-scale design variants of split-pond systems. These four designs were primarily differentiated by the mechanism of water circulation between the fish-confinement and the waste-treatment sections. The water-moving devices include the slow-rotating paddlewheel, modified-paddlewheel aerator, screw pump, and axial-flow pump. This study investigated the production, economic, and investment feasibility of these four split-pond designs under controlled conditions over multiple years. An economic engineering approach using standard enterprise budget analysis was used to develop estimates of annual costs and returns for producing foodsize hybrid catfish from four split-pond systems. The additional investment capital required for converting a traditional open pond to any of the four split-pond designs ranged from $54,400 to $71,150 per 4-ha pond. The cost of production of the four split-pond designs ranged from $2.02/kg to $2.37/kg and was less than the 3-year average fish price. Higher breakeven yields are required to cover total costs, indicating increased financial risk associated with these intensive-production systems. Net present value (NPV) was highest for the modified-paddlewheel aerator design ($223,893/4-ha pond) and lowest for the screw-pump design ($74,621/4-ha pond). Similarly, the modified-paddlewheel aerator design had the highest modified internal rate of return (31%) while the screw-pump design had the lowest returns (27%). The economic and investment feasibilities of the four split-pond designs were sensitive to the prices of fish and feed. All four designs were economically feasible under current economic conditions with the modified-paddlewheel design showing greater economic potential for adoption.

分体池是土池分为两部分：一个小型的鱼类限制池和一个较大的水处理池。使用大容量泵使水在两个水池之间循环。尽管分体式池塘已证明其具有提高土制鲶鱼池塘生产力的潜力，但各种泵系统已在商业环境中使用。选择最佳泵送系统需要对商业规模的生产和经济绩效进行系统验证。在这项研究中，我们评估了分体池系统的四种商业规模设计变体。这四种设计的主要区别在于鱼类限制区和废物处理区之间的水循环机制。调水装置有慢转水轮、改良水轮增氧机、螺杆泵、轴流泵等。本研究调查了这四种分体池设计在受控条件下多年来的生产、经济和投资可行性。使用标准企业预算分析的经济工程方法对四个分体池塘系统生产食用大小的杂交鲶鱼的年度成本和回报进行了估算。将传统开放式池塘改造成四种分体式池塘设计中的任何一种所需的额外投资资本为每 4 公顷池塘 54,400 美元至 71,150 美元不等。四种分体池塘设计的生产成本在 2.02 美元/公斤至 2.37 美元/公斤之间，低于 3 年平均鱼价。需要更高的盈亏平衡收益率来覆盖总成本，这表明与这些集约化生产系统相关的财务风险增加。改进型桨轮增氧机设计的净现值 (NPV) 最高（223,893 美元/4 公顷池塘），螺杆泵设计的净现值最低（74,621 美元/4 公顷池塘）。同样，改进的桨轮曝气机设计具有最高的改进内部回报率 (31%)，而螺杆泵设计的回报率最低 (27%)。四个分体池塘设计的经济和投资可行性对鱼和饲料的价格很敏感。在当前的经济条件下，所有四种设计在经济上都是可行的，改进的明轮设计显示出更大的采用经济潜力。改进的叶轮曝气机设计具有最高的改进内部回报率（31%），而螺杆泵设计的回报率最低（27%）。四个分体池塘设计的经济和投资可行性对鱼和饲料的价格很敏感。在当前的经济条件下，所有四种设计在经济上都是可行的，改进的明轮设计显示出更大的采用经济潜力。改进的叶轮曝气机设计具有最高的改进内部回报率（31%），而螺杆泵设计的回报率最低（27%）。四个分体池塘设计的经济和投资可行性对鱼和饲料的价格很敏感。在当前的经济条件下，所有四种设计在经济上都是可行的，改进的明轮设计显示出更大的采用经济潜力。