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

Ciência Rural

Maria Ignez Zaions¹  Bernardo Baldisserotto¹ 

[1] ,UFSM Departamento de Fisiologia Santa Maria RS

关键词: Rhamdia quelen;    fingerlings;    pH;    body ion levels;    survival;    Rhamdia quelen;    alevinos;    pH;    níveis iônicos corporais;    sobrevivência;   

DOI  :  10.1590/S0103-84782000000600020

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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