How to make fish oil fertilizer that 1) doesn't stink so bad it makes me puke walking past, and 2) doesn't attract pests?

I fish a lot and come up with a lot of fish based waste. Last year I saved some fish by product, and froze it, and buried it in my garden when it was justttttt warm enough to dig with a shovel. It thawed so slowly it kind of decomposed as it thawed and never smelled real bad. I anticipate gathering more fish by product this year and will probably forced to collect it faster than I can break it down and apply it.

How might I go about this without creating an awful stink and attracting predators and scavengers?