Here's how you do it - without harming the fish:
1. Keep a digital stand on scale on your boat.
2. Weigh yourself just before you pick up fish.
3. Then hold the big fish GENTLY in your arms.
4. Stand on the scale with fish - note the weight, release the fish within 30 seconds of catch.
5. Subtract your weight from weight when holding fish, and you get the EXACT weight of fish !!