Florfenicol [HRP]

Catfish farmers manage several bacterial diseases on their farm operations. Among them, enteric septicemia of catfish (ESC) is the most widespread and economically significant disease. Farmers have limited ESC management choices, primarily through feed restriction or treatment with medicated feed (Aquaflor [florfenicol] or Romet [ormetoprim sulfadimethoxine]). However, the management of ESC on catfish farms has economic implications given the production losses associated with the feed restriction approach and the expense of medicated feeds. This relative economic study evaluated the economics of ESC management on commercial catfish operations using medicated feeds as opposed to the feed restriction approach. The relative economic benefit of disease management varied depending on the nature of the catfish production phase, degree of disease progression, and intensity of culture practices. This study provides economic justification for the use of medicated feeds as opposed to restricted feeding in the fingerling production phase, with net benefits ranging from US$1,600/acre to $1,800/acre. However, its use in food fish production should involve consideration of various factors, such as the market price of the fish and the foregone revenue along with production aspects, such as the size of the fish and the intensity of culture practices. The study underscores the economic importance of medicated feeds in the judicious management of bacterial diseases in catfish farming.

Algal-bacterial photo-bioelectrochemical system (ABPBS) operated with daily light/dark cycle provides a novel approach for sustainable treatment of wastewater through the uses of solar energy and bioenergy. However, it can not be effectively driven when the photosynthetic oxygen supply by algae at the cathode stops at night. In this study, a solar photovoltaic capacitor discharging was integrated into the ABPBS to achieve all-weather synchronous enhanced antibiotic and nitrogen removal from wastewater. The results showed that 3.3 F, 10 F and 100 F capacitor discharge increased the degradation rate of florfenicol (FLO) by 44%, 89%, and 582% at the anode, the removal rate of ammonia nitrogen by 20.4%, 39.8%, and 55.6%, the accumulated nitrate was decreased by 70.0%, 86.5%, and 93.3%, and the accumulated nitrite was decreased by 48.6%, 45.7%, and 87.1% at the biocathode, respectively. There was a significant positive correlation between the capacity of the capacitor and its ability to promote FLO degradation and nitrogen removal. The capacitor discharge promoted the photosynthetic oxygen release and biocatalytic oxygen reduction, and stimulated the growth of functional bacteria capable of degrading complex organics through extracellular electron transfer in the anode and diverse nitrogen removal bacteria in the cathode, but there were structural differences of functional bacteria groups induced by the different capacities of capacitor discharges. (c) 2020 Elsevier Ltd. All rights reserved.