I would say probably about 6kg to 7kg biggest. As I have previously stated it's nice fishing for the bigger fish and I also do that, but it's great fun to also catch a lot off barbel even if they are only up to 5kg, especially if you are using ligt tackle.
bait for the "smaller" barbel I found to be best is
1 - Black Crickets
2 - Platties
3 - Miswurms
4 - Chicken Livers
Cheers Tiny
bait for the "smaller" barbel I found to be best is
1 - Black Crickets
2 - Platties
3 - Miswurms
4 - Chicken Livers
Cheers Tiny