Fish production, water quality, and the role of nitrification as an ammonia removal process in intensively aerated hybrid catfish ponds

IF 2.3 3区 农林科学 Q2 FISHERIES
Brian D. Ott, Eugene L. Torrans, Craig S. Tucker
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引用次数: 0

Abstract

Six 0.1‐ha earthen ponds with 45 kW/ha of aeration capacity were stocked with hybrid catfish (Ictalurus punctatus x I. furcatus) ranging from 15,000 to 90,000 fish ha−1 in 15,000 fish ha−1 increments to analyze the effect of nitrogen loading on ammonia accumulation and fish production. Minimum dissolved oxygen (DO) concentration was maintained above 3.0 mg O2 L−1 to prevent hypoxia‐induced appetite reduction. Stocking density did not impact survival but decreased average fish harvest weight and increased food conversion ratio (FCR). Gross production increased with stocking density and ranged from 7249 to 35,674 kg ha−1. Average total (TAN) and un‐ionized ammonia (NH3) were not different among stocking densities despite greater nitrogen inputs in ponds with higher feeding rates. Nitrite () and nitrate () concentrations were significantly higher in ponds with higher stocking densities, suggesting that nitrification increased with nitrogen loading. Phytoplankton assimilation of ammonia is the primary ammonia removal process in traditional catfish ponds with modest fish densities and feeding rates. However, in intensively aerated ponds with high feeding rates, nitrification can become an important process for ammonia removal. These data indicate that small earthen hybrid catfish ponds with high aeration capacities can increase catfish production without ammonia accumulating.
鱼类产量、水质以及硝化作用作为强化曝气杂交鲶鱼池塘除氨过程的作用
在六个 0.1 公顷、曝气能力为 45 千瓦/公顷的土池中放养杂交鲶鱼(Ictalurus punctatus x I. furcatus),每公顷放养 15,000 至 90,000 尾,每公顷放养 15,000 尾,以分析氮负荷对氨积累和鱼产量的影响。最低溶解氧(DO)浓度保持在 3.0 mg O2 L-1 以上,以防止缺氧引起的食欲下降。放养密度不会影响存活率,但会降低鱼的平均收获重量,增加食物转化率(FCR)。总产量随着放养密度的增加而增加,范围在 7249 至 35674 千克/公顷之间。平均总氨(TAN)和未电离氨(NH3)在不同放养密度下没有差异,尽管投喂率较高的池塘氮投入量更大。在放养密度较高的池塘中,亚硝酸盐()和硝酸盐()的浓度明显较高,这表明硝化作用随着氮负荷的增加而增强。浮游植物同化氨是鱼类密度和摄食率适中的传统鲶鱼池塘去除氨的主要过程。然而,在高投喂率的密集曝气池塘中,硝化过程可能成为去除氨氮的重要过程。这些数据表明,具有高曝气能力的小型土质杂交鲶鱼池塘可以提高鲶鱼产量,而不会造成氨积累。
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来源期刊
CiteScore
5.90
自引率
7.10%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of the World Aquaculture Society is an international scientific journal publishing original research on the culture of aquatic plants and animals including: Nutrition; Disease; Genetics and breeding; Physiology; Environmental quality; Culture systems engineering; Husbandry practices; Economics and marketing.
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