we don't have carp, but we use gar's and mud fish.we chop them into chunks 6" to 10" long and plant in garden and around plants. put around your veggie plants.works great.all the fish I catch to eat,when I clean them I save the heads and guts and put around my fruit trees.peaches , plums , persimmons. they produce great.

that was the indians main source of fertizler for there corn crops.