Most of your bread and butter species (I'm assuming salt) will take a lure that size and larger, some (flathead/jew/trevs) more readily than others (bream/whiting) - having said that I've had some pretty keen bream hit some fairly large lures intended for bigger species. If I'm actively targeting bream (for example) I'll use hardbody lures from 35mm-65mm, but with soft plastics happily get away with 80mm Squidgies and some people even prefer the larger (100mm+) models.
If you're not getting any hits try downsizing, or using a lighter jighead.
Cheers,
Adam.