Although fish guts have been used for centuries to fertilize crops, most composting advice will tell you not to compost any meat products. The drawback for the backyard gardener and composter is that the smell of the fish guts can attract vermin to your compost bin. However, by carefully composting fish guts directly into the soil, you can benefit your garden without bringing every cat in the neighborhood to your yard.
Chop the fish guts into small pieces. As with any material you are composting, the smaller the mass, the faster it will compost.
Dig an area in your garden or yard where you plan to plant. Dig 2 feet down, spread the fish guts and bury them well. Do this at least six weeks before you plant.
After six weeks, till the soil or work it with a pitchfork where you planted the fish guts.