i have had a couple of fish out of there, ran out of food this winter on a trip up there got a couple of 70s these were caught out from the sticks and were lean and very silver ,went back put them in foil with capsicum onion cheese oil pepper and salt ,cooked them on the barby and was shocked as too how nice they tasted,no fat in them at all ,as b65 said the leaner the better and around that 700mm range would be the biggest you would go.good luck