Oxytetracycline for chemical marking of piava juveniles Leporinus obtusidens: determining concentration and time of treatment

Authors

  • Mariana Roza de ABREU Programa de Pós-Graduação em Aquicultura da Universidade Federal de Santa Catarina (UFSC) http://orcid.org/0000-0001-8675-1101
  • Túlio Barbosa ARANTES Programa de Pós-Graduação em Aquicultura da Universidade Federal de Santa Catarina (UFSC)
  • Samara HERMES-SILVA Laboratório de Biologia e Cultivo de Peixes de Agua Doce (LAPAD -  UFSC). Bolsista PNPD/CAPES
  • Evoy ZANIBONI-FILHO Laboratório de Biologia e Cultivo de Peixes de Água Doce (LAPAD-UFSC)

Keywords:

scale, mass-marking, calcified structures

Abstract

The aim of this study was to define the concentrations and immersion periods for the chemical marking of piava juveniles Leporinus obtusidens using oxytetracycline (OTC). Twenty piava juveniles were used per treatment and submitted to six concentrations of OTC (50, 100, 150, 300, 500, 800 mg OTC L-1) and three immersion periods (6, 12, 24 h) and one treatment as control. Scales of three fishes per treatment were evaluated under a confocal microscope with UV light. The mean values of temperature, pH and dissolved oxygen were kept at 27.4°C, 7.2, and 7.4 mg L-1, respectively. No mortality was observed in the treatments. The presence of a chemical mark was only observed in the treatment 100 mg L-1 24 h-1, however it was of low intensity and discontinuous. Treatments with immersion periods of 12 and 24 h produced visible marks in 300 mg L-1, and clear bright and continuous marks in 500 mg L-1. Treatments of 800 mg L-1, for all immersion periods, produced clear bright and continuous marks.

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Published

2018-11-16