Dataset on brown trout (Salmo trutta) life history, metabolic status and reproductive success used in a control experiment of reproduction, to study the impact of water flow stochasticity on reproductive investment and reproductive success. Experiment A and B1 are under constant water flow. Experiment B2 is under stochastic water flow. In A, only wild fish from river Bastan, France, are placed in the channel. FOr experiments B1 and B2, wild fish from river Bastan, France , and river Urumea, Spain, are placed in sympatry in the channel. At the beginning and end of the experiment and therefore the reproduction period (duration: 2 months), fish are measured for a set of traits, and 2 months after they are removed from the channel and released in their river of origin, emerging fry are sampled and genetically assigned to their potential parents.