Monkfish and shark are the fastest options but may cost you quite a bit.Swordfish = 67, 405 (roughly 38m)Monkfish (with cooking gloves) = 62, 911 (roughly 36.5m)Shark (with cooking gloves) = 44, 937 (roughly 67.5m)Note: After cooking the fish, sell them and buy more fish, otherwise the prices above will be what you would pay without that cycle.