Prawn heads make a great base for fish stock.
Chooks absolutely love prawn heads but, if you don’t have chooks, prawn shells and heads also make fantastic compost.
If you live in an urban area and don’t have chooks or a compost bin, double wrap your heads and shells in plastic bags, pushing as much air out as you can before tying off and sealing the bag. If it is a few nights until bin night, put them in the freezer rather than leaving them in the bin. Your neighbours will thank you.
Please keep prawn waste out of rivers, canals and other waterways.