Are rice seedlings affected by changes in water quality caused by crayfish? P. M. Anastácio, A. M. Correia, J. P. Menino and L. Martins da Silva Ann. Limnol. - Int. J. Lim., 41 1 (2005) 1-6 Published online: 15 February 2009 DOI: 10.1051/limn/2005002