2013. High levels of total ammonia nitrogen as NH4+ are stressful and harmful to the growth of Nile tilapia juveniles - doi: 10.4025/actascibiolsci.v35i4.17291. Acta Scientiarum. Biological Sciences. 35, 4 (jul. 2013), 475–481. DOI:https://doi.org/10.4025/actascibiolsci.v35i4.17291.