TY - SER AU - Boujard,Thierry AU - Leatherland,J.F. TI - Demand-feeding behaviour and diel pattern of feeding activity in Oncorhynchus mykiss held under different photoperiod regimes KW - Circadian Rhythms KW - Demand Feeding Behaviour N1 - Boujard, T.- INRA Hydrobiologie, BP 3, 64310 Ascain, France ER -