  Summary - By using the data from the ESO Nearby Abell Cluster Survey (ENACS),
we have studied the properties of emission-line galaxies (ELG) in clusters. The
fraction of ELG in clusters is 16~\%; this fraction is slightly dependent on
the cluster velocity dispersion, being larger for ``colder'' systems. ELG tend
to occur more frequently than other cluster galaxies in substructures. However,
only a minor cluster fraction has an ELG population with a mean velocity
significantly different from that of the overall cluster population. The
velocity distribution of cluster ELG is broader than that of the other cluster
galaxies, which translates in a larger observed velocity dispersion. The
velocity distribution for ELG in the inner cluster regions suggests that ELG
are on mostly radial orbits.
