Not knowing what state you live in or the water temperature I'd guess
they were in pre-spawn or spawn. If this the case the bass are more
interested in the spawning cycle then eating and would be hard to catch
but not impossable. Go with light line 6#, small weightless worms/grubs
for the thin water and stay well back from the shoreline so not to spook
the bass. This could get you bit, good luck.....

sket