Semperviva Fish Soup
Otherwise known as "Karl's Fish Soup" or "decomposed fish corpse leachate." It's made in small batches so we don't have NPK analysis on it, but anecdotally it does a great job promoting healthy growth as liquid fertilizer and foliar spray.
Here's where it comes from: A guy loads salmon carcasses into a barrel, seals it up, waits 12-24 months until it's good and ready, and then strains off the liquid. We pour it into glass bottles with good tight lids so it doesn't spill all over you on your way home.