I've have raccoon, skunk, bear, feral cats, dogs, coyote, fox ect. ect. ect.
"outdoors", I've had dozens of plants pillaged by these vermin from useing fish emullsion, bone or blood meals when ammending the soil with them. Even guano and alfalfa teas have attracted them at times. They smell it, recognize it as a food source, and try to dig it up.
One thing for certain, that fish is going to need to decompose before it becomes beneficial to the plant. That doesn't happen overnight, it takes months. If "I" were going to plant a fish, I would do it "at least" 2-3 months prior to planting the plant.