Jesus said to them, “Bring some of the fish you have just caught.”
Apparently Jesus wants to supplement the fish He has already cooked with some from the large catch. He could have had enough already, but He chose not to, perhaps so they could eat of that for which they had labored (Psa 128:2).
Psalms 128:2 You will eat the fruit of your labour; blessings and prosperity will be yours.