SciELO - Scientific Electronic Library Online

 
vol.41 issue2Chemical composition and apparent digestibility of f eed found in the brazilian semiarid region for tilapia rosa feeding on cultivationDevelopment of functional yerba-mate jelly author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Ciência Rural

Print version ISSN 0103-8478

Abstract

MIRON, Denise dos Santos; BECKER, Alexssandro Geferson; LORO, Vania Lúcia  and  BALDISSEROTTO, Bernardo. Waterborne ammonia and silver catfish, Rhamdia quelen: survival and growth. Cienc. Rural [online]. 2011, vol.41, n.2, pp.349-353. ISSN 0103-8478.  http://dx.doi.org/10.1590/S0103-84782011000200028.

The aim of the present study was to determine the effects of waterborne un-ionized ammonia (NH3) on the survival and growth of silver catfish (Rhamdia quelen). Juveniles were exposed to 0.10, 0.22, and 0.42mg L-1 NH3 at pH 8.2 for 45 days. After 15 days, a significant mortality rate (33%) was observed in the fish exposed to 0.42mg L-1 NH3. After 20 days, 23% and 43% mortality (both significant) was observed in fish exposed to 0.22 and 0.42mg L-1 NH3, respectively. A significant negative relationship between survival, length, daily weight gain, standard growth rate, and biomass of juveniles of silver catfish per tank with waterborne NH3 levels was found at the end of the experiment. The resulting survival and waterborne NH3 relationship indicated that, to avoid any mortality of silver catfish, the maximum level of chronic NH3 exposure at pH 8.2 would be 0.01mg L-1.

Keywords : fish culture; nitrogenous compounds; weight gain.

        · abstract in Portuguese     · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License