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Bardhan A, Abraham TJ, Sar TK, Rajisha R, Panda SK, Patil PK. Pharmacokinetics and residues of florfenicol in Nile tilapia (Oreochromis niloticus) post-oral gavage. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2024; 108:104471. [PMID: 38763438 DOI: 10.1016/j.etap.2024.104471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 04/30/2024] [Accepted: 05/14/2024] [Indexed: 05/21/2024]
Abstract
In the study on Oreochromis niloticus, singular oral gavage of florfenicol (FFC) at 15 mg/kg biomass/day was conducted, mimicking approved aquaculture dosing. Samples of plasma, bile, muscle, intestine, skin, liver, kidney, gill, and brain tissues were collected at 0, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, and 128 hours (h) after oral gavage. LC-MS/MS analysis revealed FFC concentrations peaked at 12.15 μg/mL in plasma and 77.92 μg/mL in bile, both at 24 hours. Elimination half-lives were 28.17 h (plasma) and 26.88 h (bile). The residues of FFC ranked muscle>intestine>skin>liver>kidney>gill. In contrast, the residues of florfenicol amine (FFA) ranked kidney>skin>liver>muscle>gill>intestine>brain, particularly notable in tropical summer conditions. The minimum inhibitory concentration of FFC was elucidated against several bacterial pathogens revealing its superior efficacy. Results highlight bile's crucial role in FFC elimination. Further investigation, especially during winter when fish susceptibility to infections rises, is warranted.
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Affiliation(s)
- Avishek Bardhan
- Department of Aquatic Animal Health, Faculty of Fishery Sciences, West Bengal University of Animal and Fishery Sciences, Kolkata 700094, India; Department of Aquatic Animal Health Management, The Neotia University, Sarisha, 743368, India.
| | - Thangapalam Jawahar Abraham
- Department of Aquatic Animal Health, Faculty of Fishery Sciences, West Bengal University of Animal and Fishery Sciences, Kolkata 700094, India
| | - Tapas Kumar Sar
- Department of Veterinary Pharmacology and Toxicology, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, Kolkata 700037, India
| | - Ravindran Rajisha
- Fish Processing Division, ICAR-Central Institute of Fisheries Technology, Willington Island, Cochin 682029, India
| | - Satyen Kumar Panda
- Fish Processing Division, ICAR-Central Institute of Fisheries Technology, Willington Island, Cochin 682029, India
| | - Prasanna Kumar Patil
- Aquatic Animal Health and Environment Division, ICAR-Central Institute of Brackishwater Aquaculture, Chennai 600028, India
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2
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Shiroma LS, Bottoli CBG, Jonsson CM, Queiroz SCN. Exposure of tilapia (Oreochromis niloticus) to the antibiotic florfenicol in water: determination of the bioconcentration factor and the withdrawal period. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:39026-39034. [PMID: 33742384 DOI: 10.1007/s11356-021-13327-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 03/03/2021] [Indexed: 06/12/2023]
Abstract
The demand for healthier foods with high nutritional value has resulted in intensive fish farming. In this production system, high-frequency infections occur, and antibiotics are administrated for control. Only two antibiotics are allowed for use in Brazilian aquaculture, one of which is florfenicol. In this work, a bioconcentration assay was performed to assess the accumulation of florfenicol in the muscle of Nile tilapia (Oreochromis niloticus). Tilapia was evaluated as it is the most produced fish species in Brazil. The fish were exposed to florfenicol at a nominal concentration of 10 mg/L, through the water. Muscle and water were collected at 0, 1.5, 3, 6, 24, and 48 h during the exposure phase and at 1.5, 3, 6, 24, 48, and 120 h during the depuration phase. Quantification was performed using an LC-MS/MS. The results showed rapid absorption and elimination of the antibiotic (half-life, t1/2 = 5 h), with low potential for accumulation of florfenicol in tilapia muscles. The study was performed to determine the bioconcentration factor (BCF) and withdrawal period of florfenicol, being 0.05 mL/μg and 1.8 h, respectively. The results contribute to set protocols for the safe use of florfenicol in tilapia transport, avoiding residues in fish that may pose risks to human health.
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Affiliation(s)
- Letícia Sayuri Shiroma
- Institute of Chemistry, University of Campinas, POB 6154, Campinas, SP, 13083-970, Brazil
| | | | - Claudio Martin Jonsson
- Laboratório de Ecotoxicologia e Biossegurança, Embrapa Meio Ambiente, Rodovia SP 340, km 127,5, S/N, Jaguariúna, SP, 13918-110, Brazil
| | - Sonia C N Queiroz
- Laboratório de Resíduos e Contaminantes, Embrapa Meio Ambiente, Rodovia SP 340, km 127,5, S/N, Jaguariúna, SP, 13918-110, Brazil.
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3
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Lin HC, Chen WY. Bayesian population physiologically-based pharmacokinetic model for robustness evaluation of withdrawal time in tilapia aquaculture administrated to florfenicol. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 210:111867. [PMID: 33387907 DOI: 10.1016/j.ecoenv.2020.111867] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 12/21/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
The antimicrobial residues of aquacultural production is a growing public concern, leading to reexamine the method for establishing robust withdrawal time and ensuring food safety. Our study aims to develop the optimizing population physiologically-based pharmacokinetic (PBPK) model for assessing florfenicol residues in the tilapia tissues, and for evaluating the robustness of the withdrawal time (WT). Fitting with published pharmacokinetic profiles that experimented under temperatures of 22 and 28 °C, a PBPK model was constructed by applying with the Bayesian Markov chain Monte Carol (MCMC) algorithm to estimate WTs under different physiological, environmental and dosing scenarios. Results show that the MCMC algorithm improves the estimates of uncertainty and variability of PBPK-related parameters, and optimizes the simulation of the PBPK model. It is noteworthy that posterior sets generated from temperature-associated datasets to be respectively used for simulating residues under corresponding temperature conditions. Simulating the residues under regulated regimen and overdosing scenarios for Taiwan, the estimated WTs were 12-16 days at 22 °C and 9-12 days at 28 °C, while for the USA, the estimated WTs were 14-18 and 11-14 days, respectively. Comparison with the regulated WT of 15 days, results indicate that the current WT has well robustness and resilience in the environment of higher temperatures. The optimal Bayesian population PBPK model provides effective analysis for determining WTs under scenario-specific conditions. It is a new insight into the increasing body of literature on developing the Bayesian-PBPK model and has practical implications for improving the regulation of food safety.
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Affiliation(s)
- Hsing-Chieh Lin
- Department of Ecology and Environmental Resources, National University of Tainan, Tainan, Taiwan
| | - Wei-Yu Chen
- Department of Ecology and Environmental Resources, National University of Tainan, Tainan, Taiwan.
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4
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Kogiannou D, Nikoloudaki C, Katharios P, Triga A, Rigos G. Evaluation of absorption and depletion of florfenicol in European seabass Dicentrarchus labrax. Vet Med Sci 2020; 7:987-997. [PMID: 33369159 PMCID: PMC8136953 DOI: 10.1002/vms3.415] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 11/03/2020] [Accepted: 12/01/2020] [Indexed: 11/09/2022] Open
Abstract
The pharmacokinetic properties and residue elimination of florfenicol (FLO) and its amine were investigated in European seabass Dicentrarchus labrax at 24°C. The trial mainly included analysis of FLO in plasma after a single dose dietary administration of 10 mg/kg and in muscle plus skin following a multiple dosing (10 mg kg-1 day-1 for 7 days) to estimate pharmacokinetics and residue depletion, respectively. The maximum plasma concentration of FLO was measured to be 1.64 μg/ml, 4 hr post administration. The elimination half-life (t1/2b ) and the area under the concentration-time curve extrapolated to infinity (AUC0-∞ ) were calculated to be 13.0 hr and 34.7 μg h-1 ml-1 , respectively. Withdrawal times of FLO and its amine were calculated to be 46.3 degree-days, indicating a fast removal from the edible tissues of treated European seabass. Overall, FLO can be considered as a potentially efficient antibacterial agent for farmed European seabass provided that additional efforts will be devoted towards its in vitro and clinical efficacy.
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Affiliation(s)
- Dimitra Kogiannou
- Hellenic Centre for Marine Research (HCMR), Institute of Marine Biology, Biotechnology and Aquaculture (IMBBC), Anavyssos, Attika, Greece
| | - Chrysanthi Nikoloudaki
- Hellenic Centre for Marine Research (HCMR), Institute of Marine Biology, Biotechnology and Aquaculture (IMBBC), Anavyssos, Attika, Greece
| | - Pantelis Katharios
- Hellenic Centre for Marine Research (HCMR), Institute of Marine Biology, Biotechnology and Aquaculture (IMBBC), Former American Base of Gournes, Heraklion, Crete, Greece
| | - Adriana Triga
- Hellenic Centre for Marine Research (HCMR), Institute of Marine Biology, Biotechnology and Aquaculture (IMBBC), Former American Base of Gournes, Heraklion, Crete, Greece
| | - George Rigos
- Hellenic Centre for Marine Research (HCMR), Institute of Marine Biology, Biotechnology and Aquaculture (IMBBC), Anavyssos, Attika, Greece
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Elgeddawy SA, Shaheen HM, El-Sayed YS, Abd Elaziz M, Darwish A, Samak D, Batiha GE, Mady RA, Bin-Jumah M, Allam AA, Alagawany M, Taha AE, El-Mleeh A, El-Sayed SAA, Abd El-Hack ME, Elnesr SS. Effects of the dietary inclusion of a probiotic or prebiotic on florfenicol pharmacokinetic profile in broiler chicken. J Anim Physiol Anim Nutr (Berl) 2020; 104:549-557. [PMID: 32017274 DOI: 10.1111/jpn.13317] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 12/24/2019] [Accepted: 01/09/2020] [Indexed: 12/14/2022]
Abstract
We evaluated the effect of prebiotic or probiotic as feed additives on florfenicol kinetic in broilers feed. Unsexed two hundred, thirty-five-day-old broiler chickens, were put in four equal groups (n = 50). The first group was administrated florfenicol intravenous at 30 mg/kg body weight (BW) only once dosage without pre- or probiotic administration to determine the bioavailability. While, the second group was administrated florfenicol (intracrop routes; a dosage of 30 mg/kg BW for five progressive days) without pre- or probiotic co-administration. The third and the fourth groups were administrated the same dose of florfenicol (intracrop route) for five successive days, followed by 10 days of prebiotic or probiotic treatment respectively. The plasma florfenicol % was identified by high-pressure liquid chromatography (HPLC) after the first florfenicol administration (intravenous or intracrop routes) in all groups. Then, the residual levels of florfenicol were determined in liver, kidney and muscle tissues from the second, third and fourth groups which were exposed to florfenicol orally. Our results demonstrated that broilers pre-treated with prebiotic or probiotic significantly increased Cmax , AUC0- t , AUC0-inf as well as AUMC values, while significant drop was recorded in V/F and CL/F. Prebiotic or probiotic influenced the cumulative effect of florfenicol in liver and kidney tissues of treated birds.
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Affiliation(s)
- Samy A Elgeddawy
- Unit of Pharmacology, Department of Chemistry, Animal Health Research Institute, Giza, Egypt
| | - Hazem M Shaheen
- Department of Pharmacology, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
| | - Yasser S El-Sayed
- Department of Veterinary Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
| | - Magdy Abd Elaziz
- Department of Pharmacology, Faculty of Veterinary Medicine, Kafrelsheikh University, Damanhour, Egypt
| | - Ashraf Darwish
- Unit of Pharmacology, Department of Chemistry, Animal Health Research Institute, Giza, Egypt
| | - Dalia Samak
- Department of Veterinary Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
| | - Gaber E Batiha
- Department of Pharmacology, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
| | - Rehab A Mady
- Department of Pharmacology, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
| | - May Bin-Jumah
- Biology Department, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Ahmed A Allam
- Department of Zoology, Faculty of Science, Beni-suef University, Beni-suef, Egypt
| | - Mahmoud Alagawany
- Department of Poultry, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Ayman E Taha
- Department of Animal Husbandry and Animal Wealth Development, Faculty of Veterinary Medicine, Alexandria University, Edfina, Egypt
| | - Amany El-Mleeh
- Department of Pharmacology, Faculty of Veterinary Medicine, Menoufia University, Menoufia, Egypt
| | - Sabry A A El-Sayed
- Department of Nutrition and Clinical Nutrition, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | | | - Shaaban S Elnesr
- Department of Poultry Production, Faculty of Agriculture, Fayoum University, Fayoum, Egypt
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6
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Yang F, Zhang CS, Wang H, Yang F. Depletion study and withdrawal period calculation of florfenicol in the crucian carp (Carassius auratus) following multiple intramuscular injections. J Vet Pharmacol Ther 2019; 43:79-86. [PMID: 31691990 DOI: 10.1111/jvp.12822] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 10/14/2019] [Indexed: 11/30/2022]
Abstract
The previously adopted marker residue for florfenicol (FF) in China was only florfenicol amine (FFA); however, the marker residue has been changed to FF plus FFA since the end of 2017. The previous official withdrawal period determined based on the only concentration of FFA may no longer be suitable. Therefore, the present study aimed to determine the depletion profiles of FF and FFA and further calculate the withdrawal period in the crucian carp (Carassius auratus) based on the new marker residues. Florfenicol was intramuscularly administered at 10 mg/kg bodyweight daily for five consecutive days to crucian carps reared in freshwater at 10°C. After the last dose, plasma and tissue samples were randomly collected from 10 fish at different time points. The FF and FFA concentrations were simultaneously determined by high-performance liquid chromatography (HPLC) with a fluorescence detector and further subjected to noncompartmental analysis. The elimination half-life (h) of FF in different tissues decreased as follows: liver (39.1) > kidney (36.3) > skin plus muscle (34.6) > plasma (31.7), whereas that of FFA decreased as follows: kidney (41.4) > skin plus muscle (39.4) > liver (39.3) > plasma (35.7). Considering a maximum residue limit of 1 μg/g for the total concentration of FF and FFA in the skin plus muscle, a withdrawal period of 6 days was calculated based on the upper limit of the one-sided 95% confidence interval.
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Affiliation(s)
- Fan Yang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China.,Henan Provincial Open Laboratory of Key Disciplines in Environmental and Animal Products Safety, Henan University of Science and Technology, Luoyang, China
| | - Chao-Shuo Zhang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - Han Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
| | - Fang Yang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China
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7
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Jarau M, MacInnes JI, Lumsden JS. Erythromycin and florfenicol treatment of rainbow trout Oncorhynchus mykiss (Walbaum) experimentally infected with Flavobacterium psychrophilum. JOURNAL OF FISH DISEASES 2019; 42:325-334. [PMID: 30632170 DOI: 10.1111/jfd.12944] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 09/06/2018] [Accepted: 09/07/2018] [Indexed: 06/09/2023]
Abstract
Flavobacterium psychrophilum is responsible for significant economic losses in rainbow trout aquaculture. Antimicrobial treatment remains the primary means of control; however, there are limited choices available for use. The objectives of the study were therefore to determine the minimum inhibitory concentrations for erythromycin and florfenicol in selected F. psychrophilum isolates and to evaluate their clinical treatment efficacy in experimentally infected rainbow trout. All isolates tested had moderate susceptibility to florfenicol and erythromycin except one isolate, which had low susceptibility to erythromycin. Two isolates (one with moderate and one with low susceptibility to erythromycin) were used in an experimental infection trial. Rainbow trout juveniles were injected intraperitoneally with 108 cfu/fish and after mortality had begun, fish were given erythromycin- and florfenicol-medicated feed at a rate of 75 mg kg- 1 day- 1 and 10 mg kg- 1 day- 1 fish body weight, respectively, for 10 consecutive days. The splenic F. psychrophilum load was determined using an rpoC quantitative PCR throughout the 30-day trial. Relative to antibiotic-free controls, erythromycin treatment significantly (p < 0.05) reduced mortality of rainbow trout juveniles infected with FPG101, even when treatment was initiated after clinical signs developed.
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Affiliation(s)
- Maureen Jarau
- Fish Pathology Laboratory, University of Guelph, Guelph, Ontario, Canada
| | - Janet I MacInnes
- Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada
| | - John S Lumsden
- Fish Pathology Laboratory, University of Guelph, Guelph, Ontario, Canada
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Elia AC, Pacini N, Fioravanti ML, Dörr AJM, Zaccaroni A, Parmeggiani AM, Gustinelli A, Mordenti O, Abete MC, Prearo M. Assessment of Detoxifying Markers for Florfenicol in Rainbow Trout Liver. JOURNAL OF AQUATIC ANIMAL HEALTH 2016; 28:258-265. [PMID: 27791693 DOI: 10.1080/08997659.2016.1206637] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Florfenicol (FF) is employed in fish farms to contest or prevent bacterial infections. However, this pharmaceutical may produce reactive oxygen species that may cause biochemical changes in antibiotic-treated fish. The aim of this study was to evaluate the effect of FF on Rainbow Trout Oncorhynchus mykiss treated for 10 d with 7.5 and 15 mg/kg FF followed by a withdrawal period of 5 d. Superoxide dismutase, catalase, glutathione peroxidase, glutathione reductase, glutathione S-transferase, glyoxalase I and glyoxalase II, total glutathione, lactic dehydrogenase, and alkaline phosphatase were investigated in the livers of treated and untreated fish. A general impairment of antioxidant enzymes and metabolic indicators was measured in FF-treated Rainbow Trout. Onset of oxidative damage may have occurred during the antibiotic treatment as a consequence of the effect of FF toxicity at mainly the highest dose. Nevertheless, the rise in levels of total glutathione and glutathione S-transferase even after the withdrawal period may shield the antibiotic-mediated oxidative processes. Received December 22, 2015; accepted May 26, 2016.
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Affiliation(s)
- Antonia Concetta Elia
- a Department of Chemistry , Biology and Biotechnology, University of Perugia , Via Elce di Sotto, 8, Perugia 06123 , Italy
| | - Nicole Pacini
- a Department of Chemistry , Biology and Biotechnology, University of Perugia , Via Elce di Sotto, 8, Perugia 06123 , Italy
| | - Maria Letizia Fioravanti
- b Department of Veterinary Medical Sciences , University of Bologna , Via Tolara di Sopra, 50, Ozzano Emilia 40064 , Italy
| | - Ambrosius Josef Martin Dörr
- a Department of Chemistry , Biology and Biotechnology, University of Perugia , Via Elce di Sotto, 8, Perugia 06123 , Italy
| | - Annalisa Zaccaroni
- b Department of Veterinary Medical Sciences , University of Bologna , Via Tolara di Sopra, 50, Ozzano Emilia 40064 , Italy
| | - Alba Maria Parmeggiani
- b Department of Veterinary Medical Sciences , University of Bologna , Via Tolara di Sopra, 50, Ozzano Emilia 40064 , Italy
| | - Andrea Gustinelli
- b Department of Veterinary Medical Sciences , University of Bologna , Via Tolara di Sopra, 50, Ozzano Emilia 40064 , Italy
| | - Oliviero Mordenti
- b Department of Veterinary Medical Sciences , University of Bologna , Via Tolara di Sopra, 50, Ozzano Emilia 40064 , Italy
| | - Maria Cesarina Abete
- c National Reference Centre for the Surveillance and Monitoring of Animal Feed, State Veterinary Institute , Via Bologna, 148, Turin 10154 , Italy
| | - Marino Prearo
- d Fish Disease Laboratory , State Veterinary Institute , Via Bologna, 148, Turin 10154 , Italy
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Meinertz JR, Hess KR, Bernardy JA, Gaikowski MP, Whitsel M, Endris RG. Florfenicol residues in rainbow trout after oral dosing in recirculating and flow-through culture systems. JOURNAL OF AQUATIC ANIMAL HEALTH 2014; 26:243-250. [PMID: 25321636 DOI: 10.1080/08997659.2014.945046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Aquaflor is a feed premix for fish containing the broad spectrum antibacterial agent florfenicol (FFC) incorporated at a ratio of 50% (w/w). To enhance the effectiveness of FFC for salmonids infected with certain isolates of Flavobacterium psychrophilum causing cold water disease, the FFC dose must be increased from the standard 10 mg·kg⁻¹ body weight (BW)·d⁻¹ for 10 consecutive days. A residue depletion study was conducted to determine whether FFC residues remaining in the fillet tissue after treating fish at an increased dose would be safe for human consumption. Groups of Rainbow Trout Oncorhynchus mykiss (total n = 144; weight range, 126-617 g) were treated with FFC at 20 mg·kg⁻¹ BW·d⁻¹ for 10 d in a flow-through system (FTS) and a recirculating aquaculture system (RAS) each with a water temperature of ∼13°C. The two-tank RAS included a nontreated tank containing 77 fish. Fish were taken from each tank (treated tank, n = 16; nontreated tank, n = 8) at 6, 12, 24, 48, 72, 120, 240, 360, and 480 h posttreatment. Florfenicol amine (FFA) concentrations (the FFC marker residue) in skin-on fillets from treated fish were greatest at 12 h posttreatment (11.58 μg/g) in the RAS and were greatest at 6 h posttreatment (11.09 μg/g) in the FTS. The half-lives for FFA in skin-on fillets from the RAS and FTS were 20.3 and 19.7 h, respectively. Assimilation of FFC residues in the fillets of nontreated fish sharing the RAS with FFC-treated fish was minimal. Florfenicol water concentrations peaked in the RAS-treated tank and nontreated tanks at 10 h (453 μg/L) and 11 h (442 μg/L) posttreatment, respectively. Monitoring of nitrite concentrations throughout the study indicated the nitrogen oxidation efficiency of the RAS biofilter was minimally impacted by the FFC treatment.
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Affiliation(s)
- J R Meinertz
- a U.S. Geological Survey, Upper Midwest Environmental Sciences Center 2630 Fanta Reed Road, La Crosse , Wisconsin 54603 , USA
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10
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Di Salvo A, della Rocca G, Terzetti E, Malvisi J. Florfenicol depletion in edible tissue of rainbow trout, Oncorhynchus mykiss (Walbaum), and sea bream, Sparus aurata L. JOURNAL OF FISH DISEASES 2013; 36:685-693. [PMID: 23384074 DOI: 10.1111/j.1365-2761.2012.01437.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 10/12/2011] [Accepted: 10/14/2011] [Indexed: 06/01/2023]
Abstract
An increase in fish production has consequently brought an increase in infectious diseases in fish farms. The use of chemotherapic drugs is the most effective instrument against common bacterial agents. The number of registered drugs for use in aquaculture is limited and often veterinary practitioners resort to the off-label use of chemotherapic agents authorized for different food-producing animal species. Florfenicol is well known for its outstanding effect against various pathogenic bacteria affecting fish, and therefore, it may be a useful drug for off-label use in aquaculture. The aim of this study was to evaluate the depletion of florfenicol and its major metabolite, florfenicol amine, from the edible tissue of two fish species, rainbow trout and sea bream, following treatment with medicated feed at a dosage of 10 mg kg(-1) of bw day(-1) , for 10 consecutive days. At prefixed time points after the end of administration (0.25, 1, 2, 3, 4, 6, 7, 10, 14 and 21 days after treatment), edible tissues (muscle plus adherent skin) from 15 individuals in each group were collected and analysed by HPLC, to determine concentration of the drug in the tissue. On the basis of the obtained concentrations, withdrawal times of florfenicol in the two species were calculated. The results indicate that a drug withdrawal time of 500 °C-day, as established by Directive 2004/28/EC, for off-label drug use is more than satisfactory to guarantee the healthiness of fish products against the risk of drug residues.
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Affiliation(s)
- A Di Salvo
- Department of Pathology, Diagnostic and Veterinary Clinic, Faculty of Veterinary Medicine, University of Perugia, Perugia, Italy.
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11
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Soto E, Kidd S, Gaunt PS, Endris R. Efficacy of florfenicol for control of mortality associated with Francisella noatunensis subsp. orientalis in Nile tilapia, Oreochromis niloticus (L.). JOURNAL OF FISH DISEASES 2013; 36:411-418. [PMID: 23134104 DOI: 10.1111/j.1365-2761.2012.01425.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Revised: 06/21/2012] [Accepted: 06/29/2012] [Indexed: 06/01/2023]
Abstract
Francisella noatunensis subsp. orientalis (Fno) (syn. F. asiatica) is an emergent Gram-negative facultative intracellular bacterium. Although it is considered one of the most pathogenic bacteria in fish, there are no commercially available treatments or vaccines. The objective of this project was to determine the most efficacious concentration of florfenicol (FFC) [10, 15 or 20 mg FFC kg(-1) body weight (bw) per days for 10 days] administered in feed to control experimentally induced infections of Fno in Nile tilapia, Oreochromis niloticus (L.), reared in a recirculating aquaculture system. The cumulative mortality of fish that received 0, 10, 15 or 20 mg FFC kg(-1) bw per day was 60, 37, 14 and 16%, respectively. Francisella noatunensis subsp. orientalis genome equivalents were detected in water from all challenged groups with slight reduction in the concentration in the florfenicol-treated groups 4 days after treatment. The mean LOG of CFU Fno mg(-1) spleen was 3-5 and was present in all challenged groups at necropsy 11 days after treatment (21 days after challenge). Results show that florfenicol administered at doses of 15 and 20 mg FFC kg(-1) bw per days for 10 days significantly reduced mortality associated with francisellosis in Nile tilapia.
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Affiliation(s)
- E Soto
- Department of Pathobiology, School of Veterinary Medicine, Ross University, Basseterre, St. Kitts, West Indies.
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12
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Isachsen CH, Vågnes O, Jakobsen RA, Samuelsen OB. Antimicrobial susceptibility of Francisella noatunensis subsp. noatunensis strains isolated from Atlantic cod Gadus morhua in Norway. DISEASES OF AQUATIC ORGANISMS 2012; 98:57-62. [PMID: 22422129 DOI: 10.3354/dao02430] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A total of 30 isolates of Francisella noatunensis subsp. noatunensis isolated from Atlantic cod Gadus morhua L. were tested for susceptibility, in the form of minimal inhibitory concentration (MIC) values, against the following antibacterial agents: flumequine, oxolinic acid, ciprofloxacin, florfenicol, oxytetracycline, erythromycin, streptomycin sulphate, trimetoprim/sulphadiazine and rifampin. All the isolates had a low susceptibility to oxytetracycline, trimetoprim/sulphadiazine (Tribrissen®), erythromycin, ciprofloxacin and streptomycin with MIC values of 64, 64 to 128, 16, 8 and 32 to 128 µg ml-1, respectively. The strains were, on the other hand, susceptible to florfenicol, oxolinic acid, flumequine and rifampin with MIC values of 0.5, 0.25, 0.25 and 0.25 to 1 µg ml-1, respectively.
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GAUNT PS, LANGSTON C, WRZESINSKI C, GAO D, ADAMS P, CROUCH L, SWEENEY D, ENDRIS R. Single intravenous and oral dose pharmacokinetics of florfenicol in the channel catfish (Ictalurus punctatus). J Vet Pharmacol Ther 2011; 35:503-7. [DOI: 10.1111/j.1365-2885.2011.01340.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Gaunt PS, Endris R, McGinnis A, Baumgartner W, Camus A, Steadman J, Sweeney D, Sun F. Determination of florfenicol dose rate in feed for control of mortality in Nile tilapia infected with Streptococcus iniae. JOURNAL OF AQUATIC ANIMAL HEALTH 2010; 22:158-166. [PMID: 21192545 DOI: 10.1577/h09-044.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A dose titration study was conducted to determine the dosage of florfenicol (FFC) in feed to control Streptococcus iniae-associated mortality in Nile tilapia Oreochromis niloticus. Six tanks were assigned to each of five treatments: (1) not challenged with S. iniae and fed unmedicated feed; (2) challenged with S. iniae by injection and fed unmedicated feed; (3) challenged with S. iniae and given FFC at 5 mg/kg of body weight (bw) in medicated feed; (4) challenged with S. iniae and given 10 mg FFC/kg bw; and (5) challenged with S. iniae and given 15 mg FFC/kg bw. Treatment was initiated the day after inoculation, and feed was administered for 10 d. Cumulative mortality was 0% in the unchallenged, untreated group; 35.8 +/- 4.4% (mean +/- SE) in the challenged, unmedicated group; 19.2 +/- 2.7% in the 5-mg/kg treated group, 12.5 +/- 3.8% in the 10-mg/kg group, and 2.5 +/- 1.1% in the 15-mg/kg group. The cumulative mortality was significantly less in each challenged, FFC-treated group than in the challenged, unmedicated controls (5 mg/ kg: P = 0.0156; 10 mg/kg: P = 0.0007; 15 mg/kg: P < 0.0001). The efficacy of the 10- and 15-mg/kg FFC dosages was studied in a separate dose confirmation study. Fish in all tanks were injected with S. iniae. At 4 h postinoculation, 10 tanks were assigned to each of three feed treatments: (1) unmedicated feed; (2) 10 mg FFC/kg bw; and (3) 15 mg FFC/kg bw. Cumulative mortality was 20.5 +/- 2.0% in the challenged, unmedicated group; 11.0 +/- 2.1% in the 10-mg/kg group; and 5.5 +/- 2.4% in the 15-mg/kg group. Mortality was significantly less in the medicated groups than in the challenged, unmedicated control group (10 mg/kg: P = 0.0270; 15 mg/kg: P = 0.0007). Fish in both studies were necropsied, cultured for bacteria, and examined for gross lesions. The minimum inhibitory concentration of FFC against S. iniae in both studies ranged from 0.5 to 1.0 microg/mL. Florfenicol was palatable, safe, and efficacious for control of Nile tilapia mortality due to S. iniae infection.
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Affiliation(s)
- Patricia S Gaunt
- Thad Cochran National Warmwater Aquaculture Center, College of Veterinary Medicine, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776, USA.
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In vitro and in vivo efficacy of florfenicol for treatment of Francisella asiatica infection in tilapia. Antimicrob Agents Chemother 2010; 54:4664-70. [PMID: 20713674 DOI: 10.1128/aac.00206-10] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Francisella asiatica is a recently described, Gram-negative, facultative intracellular fish pathogen, known to be the causative agent of francisellosis in warm-water fish. Francisellosis outbreaks have increased in frequency among commercial aquaculture operations and have caused severe economic losses in every case reported. The lack of effective treatments for piscine francisellosis led us to investigate the potential efficacy of florfenicol for inhibition of F. asiatica in vitro and as an oral therapeutic agent in vivo. The MIC of florfenicol for F. asiatica, as determined by the broth dilution method, was 2 μg/ml, which indicates its potential efficacy as a therapeutic agent for treatment of francisellosis. The intracellular susceptibility of the bacterium to florfenicol in tilapia head kidney-derived macrophages (THKDM) was also investigated. Addition of florfenicol to the medium at 10 μg/ml was sufficient to significantly reduce bacterial loads in the THKDM in vitro. Cytotoxicity assays done in infected THKDM also demonstrated drug efficacy in vivo, as determined by lactate dehydrogenase (LDH) release. Levels of LDH released from infected THKDM were significantly lower in macrophages treated with florfenicol (P < 0.001) than in untreated cells. In medicated-feed trials, fish were fed 15 mg of florfenicol/kg of fish body weight for 10 days, and the feeding was initiated at either 1, 3, or 6 days postchallenge. Immersion challenges resulted in 30% mean percent survival in nontreated fish, and fish receiving medicated feed administered at 1 and 3 days postinfection showed higher mean percent survival (100% and 86.7%, respectively). A significant decrease (P < 0.001) in bacterial numbers (number of CFU/g of spleen tissue) was observed in treated groups compared to nontreated infected fish at both 1 and 3 days postchallenge. There were no differences in bacterial burden in the spleens between fish treated 6 days postchallenge and untreated controls. In conclusion, if florfenicol is administered during early stages of infection, it has the potential for effectively treating piscine francisellosis, including the capacity for intracellular penetration and bacterial clearance.
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