Abstracts / Papers

Bacterial coldwater disease is westslope cutthroat trout: Hatcher epidemiology and control.

Bacterial coldwater disease, caused by the gram-negative bacterium Flavobacterium psychrophilum, is responsible for significant losses of hatchery-reared salmonids worldwide. We used Washoe Park State Fish Hatchery in Anaconda, Montana, as a case study to enhance understanding of the disease in a hatchery setting and to develop practical hatchery-management strategies to better control the pathogen and the disease.

Effect of florfenicol on the immune response of rainbow trout (Oncorhynchus mykiss).

Florfenicol, a drug effective against several bacterial diseases of fish, was tested for possible immunomodulatory effects. The aim of the study was to follow the kinetics of the immune response after vaccination with simultaneous oral antibiotic treatment. The fish were immunised with a commercial oil-based divalent (furunculosis/vibriosis) vaccine and were simultaneously given oral antibiotic treatment.

Determination of florfenicol amine in channel catfish muscle by liquid chromatography

A method for quantifying florfenicol amine (FFA) in channel catfish muscle was validated according to U.S. Food and Drug Administration guidelines. FFA is the proposed marker residue for the veterinary antibiotic florfenicol in catfish muscle for regulatory surveillance purposes.

Safety of AQUAFLOR administered in feed to channel catfish, Ictalurus punctatus

Aquaflor, a feed premix containing the broad spectrum antibacterial agent florfenicol (50% w/w), is being developed for use to control enteric septicemia (ESC) in channel catfish Ictalurus punctatus caused by the gram-negative enterobacterium Edwardsiella ictaluri.

Preliminary assessment of the tolerance and efficacy of florfenicol against Edwardsiella ictaluri administered in feed to channel catfish

A tolerance study was conducted to determine the palatability of florfenicol to channel catfish Ictalurus punctatus. Four tanks of fish (20 fish/tank) were assigned to each of five treatments distinguished by the amount of florfenicol given in feed per kilogram of body weight, namely, 0, 10, 20, 40, or 100 mg.A tolerance study was conducted to determine the palatability of florfenicol to channel catfish Ictalurus punctatus. Four tanks of fish (20 fish/tank) were assigned to each of five treatments distinguished by the amount of florfenicol given in feed per kilogram of body weight, namely, 0, 10, 20, 40, or 100 mg.

Field Efficacy of Florfenicol for Control of Mortality in Channel Catfish, Ictalurus punctatus (Rafinesque), Caused by Infection With Edwardsiella ictaluri

A field study to assess the efficacy of florfenicol (FFC) against enteric septicemia of catfish (ESC) was conducted with pond-reared channel catfish fingerlings held in 0.1-acre earthen ponds. Fish were challenged with Edwardsiella ictaluri in a natural pond outbreak or by cohabitation with E. ictaluri-infected fish held in netpens.