The effect of tryptophan supplemented diets on brain serotonergic activity and plasma cortisol under undisturbed and stressed conditions in grouped-housed Nile tilapia Oreochromis niloticus
Catarina I.M. Martins, Patricia Silva, Benjamin Costas, Bodil K. Larsen, Goncalo Santos, Luís E.C. Conceição, Jorge Dias, Øyvind Øverli, Erik Höglund, Johan W. Schrama