I know that black currants and Gooseberry can be hybridized (to form so called Josta berries) but are thes Josta berries fertile and can they form viable seeds?

I recently planted some of these currants and I am wandering if it would be worth the effort trying to hybridize them next spring.

Regards,
Gertjan

Actually, from what I've read the offspring wouldn't form fruit. It was after treatment with colchicine that the various Jostaberries were developed. Wikipedia says that Jostaberries are self fertile.

Post-Crescent: Jostaberry

Wikipedia: Jostaberry