Acute toxicity and environmental risk of oxytetracyline and florfenicol antibiotics to pacu (Piaractus mesopotamicus)

Authors

  • Silvia Patrícia CARRASCHI UNESP Aquaculture Centre (Centro de Aquicultura da UNESP - CAUNESP) http://orcid.org/0000-0002-5170-8901
  • Natália Sayuri SHIOGIRI Natural Resource Ecology Graduate student at University Federal of São Carlos (UFSCar)
  • Francine Perri VENTURINI Genetics and Evolution Graduate student at University Federal of São Carlos (UFSCar) http://orcid.org/0000-0002-9387-5003
  • Claudinei da CRUZ Weed Environmental Research and Studies (Núcleo de Estudos e Pesquisas Ambientais em Matologia -  NEPEAM) of the College of Agricultural and Veterinary Sciences at Unesp http://orcid.org/0000-0003-4064-0718
  • Ana Cristina Fausto GÍRIO Weed Environmental Research and Studies (Núcleo de Estudos e Pesquisas Ambientais em Matologia -  NEPEAM) of the College of Agricultural and Veterinary Sciences at Unesp
  • Joaquim Gonçalves MACHADO NETO Weed Environmental Research and Studies (Núcleo de Estudos e Pesquisas Ambientais em Matologia -  NEPEAM) of the College of Agricultural and Veterinary Sciences at Unesp

Keywords:

xenobiotic, toxicity, neotropical fish

Abstract

The oxytetracycline (OTC) and florfenicol (FLO) are the most used antibiotics for bacterial disease control in fish. The aims are: estimating the lethal concentration 50% initial (LC(I)50;48h) of OTC (Terramicina®) and FLO (Aquaflor®) for pacu (Piaractus mesopotamicus); classifying OTC and FLO according to the acute toxicity and the risk of environmental intoxication; and assessing OTC and FLO dilution effect in water quality variables. Fish were acclimatized for 10 days in a bioassay room at 27 ± 2°C. Then, nine animals (three each concentration) were exposed to 7.0; 7.5; 8.0 or 8.5 mg L-1 of OTC or to 600.0; 700.0; 800.0; 900.0 and 1000.0 mg L-1 of FLO and a control treatment. The water quality variables recorded daily were: pH, temperature, electric conductivity, and dissolved oxygen. OTC and FLO were classified according to acute toxicity and environmental risk. The estimated OTC LC(I)50;48h for pacu is 7.6 mg L-1 and the estimated FLO is >1000 mg L-1. OTC reduced the dissolved oxygen concentration, and it was considered moderately toxic, causing risk of environmental intoxication to pacu. FLO is not toxic; it does not cause risk of environmental intoxication to pacu and does not change water quality variables.

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Published

2018-07-12

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