Hybrids

We often get asked on here 'whats this fish'. Then we get some weird and wonderful suggestions.
To my knowledge there are very few species likely to hybridise.
Any of the carp family can hybridise among themselves, excluding grass carp and including crucians and brown goldfish.
Roach rudd and bream will readily cross with each other.
And ive heard that chub and dace can cross.
Do you know of any others.

Never heard or seen a tench hybrid and thats a member of the carp family

The sub groups within the carp family limit hybridisation.

Chub x dace and dace x roach may be theoretically possible but dace spawn much earlier than chub and roach so the hybrids are not found.

Bleak can hybridise with chub and roach.

Silver bream can hybridise with bream, roach and rudd, possibly bleak.

Minnows, tench and gudgeon don't seem to hybridise, nor do barbel in this country though where there are other species of barbel it may be possible.

Trout and salmon can hybridise.

Chub and bream can theoretically hybridise but I've yet to see an example outside of a lab; possibly what people call chub x bream are actually silver bream as people have a lot of trouble with this common fish.

It's not clear what other species ide hybridise with.

Bream
Silver bream
Bleak
Chub
Dace
Ide/Orfe
Roach
Rudd

Can all hybridise with each other as can

Carp
Goldfish
Crucian carp

Pike, Zander and Barbel do hybridise with other species but there are no compatible species in this country