[1] Nilton Lins Univ, Postgrad Program Aquaculture, Manaus, AM, Brazil
[2] Fed Univ Minas Gerais UFMG, Sch Vet Med, Dept Prevent Vet Med, Belo Horizonte, MG, Brazil
[3] Aquaculture Res Ctr, Fisheries Inst, APTA, SAA, Sao Paulo, Brazil
[4] Sao Paulo State Univ Unesp, Aquaculture Ctr Unesp, Lab Microbiol & Parasitol Aquat Organisms, Jaboticabal, SP, Brazil