  Galaxies in clusters undergo several phenomena such as ram pressure stripping
and tidal interactions, that can trigger or quench their star formation and, in
some cases, lead to galaxies acquiring unusual shapes and long tails. We
searched for jellyfish galaxy candidates in a sample of 40 clusters from the
DAFT/FADA and CLASH surveys covering the redshift range 0.2<z<0.9. In MACS
J0717.5+3745 (MACS0717), our large spatial coverage and abundant sampling of
spectroscopic redshifts allowed us to pursue a detailed analysis of jellyfish
galaxy candidates in this cluster and its extended filament. We looked at the
Hubble Space Telescope images of all the cluster galaxies (based on redshifts),
and classified them as a function of their likeliness to be jellyfish galaxies,
and give catalogues of jellyfish candidates with positions, redshifts,
magnitudes, and projected distance to the respective cluster centre. We found
81 jellyfish candidates in the extended region around MACS0717, and 97 in 22
other clusters. Jellyfish galaxy candidates in MACS0717 tend to avoid the
densest regions of the cluster, while this does not appear to be the case in
the other clusters. For 79 galaxies in MACS0717 and 31 in other clusters, we
computed the best stellar population fits with LePhare through the GAZPAR
interface. We find that jellyfish candidates tend to be star forming objects,
with blue colours, young ages, high star formation rates and specific star
formation rates. In a SFR versus stellar mass diagram, jellyfish galaxy
candidates appear to have somewhat larger SFRs than non-jellyfish star forming
galaxies Based on several arguments, the jellyfish candidates identified in
MACS0717 seem to have fallen rather recently into the cluster. A very rough
estimate of the proportions of jellyfish galaxies in the studied clusters is
about 10%.

Astrophysics of Galaxies