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ABSTRACT
Behavioral responses, blood markers, and fillet properties were investigated after silver catfish exposure to different electric field strengths, frequency, and duration of electric current in the preslaughter stunning. All combinations of electric fields and frequencies were able to stun fish. Longer apparent stun was obtained at the intermediate electrical frequencies. High electric field strength detracted the texture of fillets. At least 5 s was required to stun fish, and longer exposure to electrical current did not prolong the apparent stun or damage fillet properties. Results indicate that silver catfish are relatively resistant to electronarcosis.
Acknowledgments
The authors thank Luiz Fernando Guarenti Martins and Fernando Coelho de Faria Correa for building the electrical device used in this study.
Funding
This study was supported by PRONEX (FAPERGS/CNPq), CT-AGRO (MCT/MPA/FINEP), Casadinho/PROCAD (MCT/CNPq/MEC/Capes), and Edital Capes 13/2008—Pró-Equipamentos Institucional—UFSM. Authors BB, LJGB, VLL, and TE are the recipients of CNPq Research Fellowships (301156/2012-3, 301992/2014-2, 312983/2013-1, and 309227/2013-5, respectively). Author JCV is the recipient of FAPERGS doctoral scholarship.