Fatahi, S. and Hoseini, S.M. 2013. Effect of dietary tryptophan and betaine on tolerance of Caspian roach (Rutilus rutilus caspicus) to copper toxicity. International Journal of Aquatic Biology. 1, 2 (May 2013), 76–81. DOI:https://doi.org/10.22034/ijab.v1i2.29.