Chum. This is what you feed housecats, not people.
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My cat finds processed salmon and tuna discards yummy. Me, not even willing to give them a try.
In the Northwest we use fish remains for other purposes, too. Salmon remains are highly effective, nutrient-rich fertilizer, providing nitrogen, phosphorus, potassium, and calcium to plants. They are used in gardens by burying carcasses deep in soil, composting, or fermenting into liquid fertilizer. Salmon carcasses are often used on vegetables, fruits, and trees, with a, University of Washington study via Facebook or by foraging animals, serving as a primary nutrient source for Pacific Northwest ecosystems. So there are other purposes.
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