I live on the high ground within a few 100 feet of a river, which flooded a few weeks ago leaving lots of muck and silt when the water receded. As soon as the trail dried, I went down in my 4x4 and gathered a couple of buckets of the stuff, brought it back and put it on my tomato, Serrano and zucchini plants-I noticed over the weekend that the plants have triple the number of blossoms they did before, and the tomatoes are setting 6 and more fruits at a time. I don’t know if it was the fish s*** in the river muck, but it certainly didn’t do any harm-I will have tomatoes to eat and enough to barter along with my fresh herbs for free range eggs and goat’s cheese from a neighbor...
That muck is probably loaded with minerals and organic matter. You can see from how your plants responded that it was a good idea.
My base soil is tough adobe clay with virtually no organic matter. I have a compost pile and a small worm farm to generate organic material, nothing plant based goes to waste. My biggest issue right now is midnight raids from thieving animals.