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The objective of this study was to investigate the effect of water pH on survival and Na+ and K+ body levels of fingerlings of Rhamdia quelen, a freshwater catfish. Survival was 100% at pH 4.00 to 9.0 throughout the experiment (96h), and death of all fingerlings was observed only at pH 3.75 or lower and at pH 10.50. There was a significant correlation between water pH and body Na+ levels (but not K+ levels) 72h after transfer. There was a clear reduction in Na+ levels when the transfer was to pH outside the 5.0 - 9.0 range, which is in agreement with the fact that fishes exposed to such pH’s present loss of ions by diffusion and/or a decrease in absorption. Growth experiments with this species probably would present best results within the 5.0 - 9.0 pH range, in which the decrease of body Na+ levels is reduced. O objetivo deste estudo foi analisar o efeito do pH da água na sobrevivência e níveis corporais de Na+ e K+ de alevinos de Rhamdia quelen, um peixe de água doce. A sobrevivência foi de 100% ao longo do experimento (96h) na faixa de pH de 4,0 a 9,0, e foi observado mortalidade total dos alevinos em pH abaixo de 3,75 (e inclusive) e em pH 10,5. Houve uma correlação significativa entre o pH da água e os níveis corporais de Na+ (mas não de K+) 72h após a transferência. Quando os alevinos foram transferidos para um pH fora da faixa de 5,0 - 9,0, houve uma nítida redução dos níveis corporais de Na+, concordando com o fato que peixes expostos a esses níveis de pH apresentam perda de íons por difusão e/ou uma redução na sua absorção. O crescimento dessa espécie, provavelmente, é estimulado dentro da faixa de pH 5,0 - 9,0, na qual a diminuição dos níveis corporais de Na+ foi menor

Na+ and K+ body levels and survival of fingerlings of Rhamdia quelen (Siluriformes, Pimelodidae) exposed to acute changes of water pH.