A set of laboratory experiments, meant to study the transport of passive 
tracers by coherent vortices, have been carried out in the large-scale rotating 
tank (14 m in diameter) of the Coriolis Laboratory (LEGI-IMG) in Grenoble, 
France. In each experiment, we have obtained long-lived coherent structures in a 
shallow water, quasi two-dimensional set-up, for different values of the Rossby 
number and of the water depth. Particle Image Velocimetry and Laser Induced 
Fluorescence have been used in order to get both qualitative information on the 
turbulent field and quantitative velocity measurements. Direct Lagrangian 
information at fixed depth was provided by a few float-like tracers released 
either inside or outside vortices. After interpolation in time, the experimental 
velocity fields have been used to numerically integrate the motion of passive 
tracer particles. Here we discuss the results of the analysis of the 
trajectories of the float-like tracers as well as the Lagrangian data obtained 
by the numerical integration using experimental Eulerian fields.