“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” (2013) Acta Scientiarum. Biological Sciences, 35(4), p. 475–481. doi:10.4025/actascibiolsci.v35i4.17291.