Multiple‐batch production is the most widely practiced method of raising channel catfish. Producers are increasingly adopting intensified production practices in multiple‐batch systems by increasing stocking density and aeration rates as a means to improve cost efficiencies. Proven stocking recommendations are required for the efficient implementation of recent developments in multiple‐batch production. Twelve 0.4‐ha ponds were understocked with 17,484, 20,612, and 26,124 fingerlings/ha (mean weight = 40 g/fish) over equal weights of carryover fish (0.46 kg/fish @ 4,589 kg/ha). Fish were fed once daily to apparent satiation with a 28% protein floating feed and aerated with a single 7.4‐kW electric paddlewheel aerator. Density‐dependent significant differences were absent for gross, net, daily net yields, marketable yields (≥0.54 kg), growth (g/day), and survival. Sub‐marketable yield (<0.54 kg) and feeding rate increased significantly with increased understocking density. Economic analysis revealed increased breakeven prices and diminished net returns with increased stocking density when sub‐marketable fish were not considered as revenue. These differences in production costs and profits among the three treatments became minimal when sub‐marketable fish were included as revenue. All three density treatments attained positive annual net cash flows. This study validates channel catfish understocking densities of 17,000–26,000 fish/ha to improve cost efficiency in intensively aerated, multiple‐batch production systems.

中文翻译：

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集约化多批次生产中河cat鱼鱼种种群密度不足的影响

多批次生产是养channel鱼的最广泛实践的方法。生产者越来越多地采用多批次系统中的集约化生产实践，通过提高库存密度和通气率来提高成本效益。有效地实施多批次生产中的最新进展需要可靠的库存建议。在相等重量的残留鱼（0.46千克/鱼@ 4,589千克/公顷）的情况下，有12个0.4公顷的池塘的鱼塘养分不足，分别有17,484、20,612和26,124个鱼种（平均重量= 40克/鱼）。每天用28％的蛋白质漂浮饲料喂鱼一次，使其明显饱食，并用一个7.4kW的电动明轮曝气机充气。在总的，净的，每日的净产量，可销售的产量（≥0.54kg），增长（克/天）和生存率。随着库存不足密度的增加，可出售的亚产量（<0.54千克）和饲喂速率显着增加。经济分析显示，当不考虑将可销售副产品的鱼视为收入时，收支平衡价格上升，净收益减少，放养密度增加。当将可销售副产品的鱼计入收入时，三种处理方法之间的生产成本和利润差异变得最小。三种密度处理均获得正的年度净现金流量。这项研究验证了channel鱼17,000–26,000鱼/公顷的资源不足密度，以提高集气，多批生产系统的成本效率。经济分析显示，当不考虑将可销售副产品的鱼视为收入时，盈亏平衡价格上涨，净收益减少，放养密度增加。当将可销售副产品的鱼计入收入时，三种处理方法之间的生产成本和利润差异变得最小。三种密度处理均获得正的年度净现金流量。这项研究验证了channel鱼17,000–26,000鱼/公顷的资源不足密度，以提高集气，多批生产系统的成本效率。经济分析显示，当不考虑将可销售副产品的鱼视为收入时，收支平衡价格上升，净收益减少，放养密度增加。当将可销售副产品的鱼计入收入时，三种处理方法之间的生产成本和利润差异变得最小。三种密度处理均获得正的年度净现金流量。这项研究验证了channel鱼17,000–26,000鱼/公顷的资源不足密度，以提高集气，多批生产系统的成本效率。三种密度处理均获得正的年度净现金流量。这项研究验证了channel鱼17,000–26,000鱼/公顷的资源不足密度，以提高集气，多批生产系统的成本效率。三种密度处理均获得正的年度净现金流量。这项研究验证了channel鱼17,000–26,000鱼/公顷的资源不足密度，以提高集气，多批生产系统的成本效率。