Aquashade is a dye that is used to control the growth of underwater weeds by reducing light penetration through water. We applied four, monthly applications of 1 μL/L Aquashade to three Channel Catfish Ictalurus punctatus ponds during the summer growing season to determine its effects on water quality and incidence of off‐flavor in catfish. Three ponds were untreated controls. Dye treatments had no effect on nitrite or total ammonia concentrations, hours of supplemental aeration, phytoplankton standing crops, or fish production. Cyanobacteria that are known to produce odorous metabolites were found in all of the ponds at some time during the study. On the sampling date immediately before fish harvest, two ponds in each treatment contained populations of the odor‐producing cyanobacterium, Planktothrix perornata and contained fish that would not be acceptable for processing because of musty off‐flavors. The mechanism of action of the dye—reducing water‐column penetration of light in wavelengths of ~600–650 nm—will have little effect on odor‐producing species of cyanobacteria because those species have physiological adaptations (nonchlorophyll accessory pigments and the ability to regulate their position in the water column), which allow them to thrive in low‐light environments.

中文翻译：

---

池塘染料，Aquashade，不能防止池塘养殖Channel鱼中的蓝细菌异味

Aquashade是一种染料，可通过减少光线透过水来控制水下杂草的生长。我们在夏季生长季节对三个海Channel鱼Ictalurus punctatus池塘进行了四个月度1μL/ L Aquashade施用，以确定其对水质和cat鱼异味发生率的影响。三个池塘是未经处理的对照。染料处理对亚硝酸盐或总氨浓度，补充通气时间，浮游植物站立作物或鱼类生产没有影响。在研究过程中的某些时间，在所有池塘中发现了已知会产生有味代谢产物的蓝细菌。在紧接鱼类收获之前的采样日期，每种处理中的两个池塘中都含有产生异味的蓝细菌种群，浮游植物浮游生物和所含鱼类由于霉味变味而不能被加工。染料的作用机理（减少约600-650 nm波长的水的水柱穿透）对蓝藻产生气味的物种几乎没有影响，因为这些物种具有生理适应性（非叶绿素辅助色素和调节色素的能力）。它们在水柱中的位置），使它们能够在弱光环境中蓬勃发展。