I've never had any big fish die on me but i bury them in the garden. i have a little cemetery for them with each having their own unofficial tombstones that usually get lost in winter.
1.Go to parents house.
2.Fling it into the fields.
3.Say a nice goodbye as they hit the ground 25 feet away.
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ive always wanted to have my deceased fish taxidermied and mounted on the wall...considering they were of worthy size and splendor.