Ventilation, gill perfusion and blood gases in dourado, salminus maxilosus valenciennes (Teleostei, Characidae), exposed to graded hypoxia - Salvo Souza, Roberto Huet de; Soncini, Roseli; Glass, Mogens Lesner; Sanches, José Roberto; Rantin, Francisco Tadeu (Journal of Comparative Physiology B, 2001)