Hey Mark glad you found that interesting. Generally speaking we have carp (common, crucian and mirror), tench, pike, perch, roach, bream, chub and eel in our fresh waters. All of these are edible, but virtually none are eaten today. In fact it is, for the most part, illegal to not return fish to the water once caught and is considered unsporting not to do so. Fish stocks and habitats are tightly controlled for the good of the various species, and course fishing is policed by bailiffs and licencing for the good of the sport and the environment. Trout, salmon and some inland salt water varieties can be caught to eat but usually at a price. Generally speaking it's now sport only.