Treat them very much like signal crayfish, both are allegedly omnivorous but both show a distinct dislike for several plant based baits and absolutely devour all fish based baits; pellets, boilies etc
If allowed to use Tiger nuts do so over a bed of hemp, with a few Tiger nuts in PVA works very well BUT be aware it is very easy to over feed Tiger nuts.
As mentioned above they don't like hemp so any bait inconjunction with it should work well.
Maize/sweetcorn though eaten by Poisson Chat (and crays) neither tend to bother for long with flavoured artificial versions??!!
And Chick peas, flavoured or not don't seem to get the unwanted attention from the dreaded P.C's (or crays).
So bed of hemp fished in conjunction with Tiger nuts, Chick peas, artificial baits and I'd hazard a guess at many beans and nuts also not getting their attention. Give a few a try as Chick peas etc don't seem to have a very long period of success before the fish go off them.
Here's a guide to some potential baits and there prep times:
Particle Preparation times and Additives - CarpForum - Carp.com
