I try to keep a certain look; a width to length proportion that looks healthy but doesnt make you think 'fatty'. You dont want to send a male into brumation without enough body fat to make it thru until he starts eating again, especially if he's breeding lots and burning it up making little swimmers and courting.

My biggest male is ~1200g. I would have no problem taking them up to 1500g or more depending on length and body type. I have several males who seem to stay around 900 to 1000g; but they like to breed more than they like to eat. They'd breed all year if I let them lol

Anyhow hope this helps
Albie