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Ciência Rural

Print version ISSN 0103-8478On-line version ISSN 1678-4596

Abstract

BECKER, Alexssandro Geferson et al. Dissolved oxygen and ammonia levels in water that affect plasma ionic content and gallbladder bile in silver catfish. Cienc. Rural [online]. 2009, vol.39, n.6, pp.1768-1773.  Epub July 03, 2009. ISSN 0103-8478.  http://dx.doi.org/10.1590/S0103-84782009005000132.

Ionic contents (Na+, K+ and Cl-) of plasma and gallbladder bile (GB) of juveniles silver catfish, Rhamdia quelen (156.1±0.2g, 28.2±0.3cm), were determined in three different times (0, 6 and 24h) after exposure to: a) control or high dissolved oxygen (DO = 6.5mg L-1) + low NH3 (0.03mg L-1); b) low DO (3.5mg L-1) + low NH3; c) high DO + high NH3 (0.1mg L-1); and d) low DO + high NH3. High waterborne NH3 or low DO levels increased plasma and GB ion levels. These parameters might have followed different mechanisms to affect osmoregulation since a synergic effect of these variables was detected.

Keywords : nitrogen compound; hypoxia; ion levels; jundiá; osmoregulation.

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