Looking for fish recommendations

I am wanting to start a new IBC setup, I live in Spain, so about 35°C in the summer, 5°C in the winter. I'd rather it be a species that doesn't need me to heat the water, but if I have no other choice I will. I would like it if they are easy to reproduce so I don't have to keep buying fry. Catfish are a no go as they are illegal to keep here. Any ideas for an edible fish that meets these criteria?