Metodologia de infecção experimental e grau de susceptibilidade do híbrido

Souza, Valéria Nogueira de, Martins, Maurício Laterça, Moraes, Flávio Ruas de, Kronka, Sérgio do Nascimento

Metodologia de infecção experimental e grau de susceptibilidade do híbrido "tambacu" e Leporinus macrocephalus Garavello & Britski (Osteichthyes, Anostomidae) a quatro inóculos de trofozoítos de Icthyophthirius multifiliis Fouquet (Protozoa, Ciliophora)

AUTOR(ES)

Souza, Valéria Nogueira de, Martins, Maurício Laterça, Moraes, Flávio Ruas de, Kronka, Sérgio do Nascimento

FONTE

Revista Brasileira de Zoologia

DATA DE PUBLICAÇÃO

2001-09

RESUMO

Tropical fishes like Leporinus macrocephalus Garavello & Britski, 1988 ("piauçu") and the hybrid "tambacu" (Piaractus mesopotamicus Holmberg, 1887 "pacu" male x Colossoma macropomum Cuvier, 1818 "tambaqui" female) were experimentally infected with four inocula of trophonts of Ichthyophthirius multifiliis Fouquet, 1876 (Protozoa, Ciliophora) and the infection level was evaluated. Each one of twelve experimental units consisted of a tank with 200 liters of water and two specimens of each kind of fish. The following treatments were designed to each tank, in triplicate: 8, 16,32 and 64 trophonts. After 8 days of exposure the fishes were killed and the number of trophonts was counted at a stereoscopic microscope. This assay showed to be feasible at tropical conditions and was able to show that "tambacu" was more susceptiblc than "piauçu".