Re: fish guts, is there any chance that you can save the stuff and use it for bait for the next round of fishing? I suppose depending on what you are after, it may work.

I would also think that disposing of them using the same guidelines as a latrine/cathole would be ok.
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It's not the weight of the load, it's how you carry it.

"Bear ye one another's burdens." Gal 6:2