Too good to waste like that Zac.
As soon as you land them, “trunk” them, that is take off the fins and head and gut them, then drop them in a bucket of water direct from the sea. (Never put fresh water on them!)
Then COVER the bucket with a wet towel or similar to keep the sun off.
Once you have done that, bury the fins and gut so as NOT to spoil the fishing ground until the next tide anyway.
If the water becomes slightly pink, change it as you would if it gets warm in the sun.
This method ensures you have a good eating fish and not one you need to bury under the grapevine.