Hi NicePix,
The one you appended the following to:
- I'm sorry but it ain't a Cru, it's got too few scales along it's lateral line (I count 27 rather than 32-34) and too few on the diagonal between dorsal to Lateral line (I reckon 6 rather than 7-8) - also it's caudal fin looks too forked - they are usually flatter more like a tench's tail. Quite possibly a Gibel or a Cru hybrid.
Counting the Lateral line scales is a pain when you are trying to get them back in the water quickly - they always flip when they hear "19, 20, 21..." - "Bu88er.. 1, 2, 3,....."!
Tight Lines!