Disagree. Like I said, waste is waste regardless of where it comes from. Saying that user group #1's waste also means that user group #2's waste is wholly justified leaves everyone blind. Just stop wasting.

That level of biomass in one small area results in putrification and soil contamination. It semi-sterilizes said spot for some time. Naturally spawning (and dying) salmon are spread out throughout the river (in current) balancing the PH, bacteria, micro-organisms and other actors naturally. This immediate area will be nothing but a bacteria and fungal mat for some time. It's is not a natural event and Mother Nature does not accept it as so, regardless of how you feel about it.