Lately Ive been working on correcting the mistakes I made during the 1st mussel habitat installation. (Please refer to my page "Mussels for Bio-remediation page) In order to protect the mussels from predators (raccoons), I designed and create a crown that would deter animals while allowing plenty of perforation for water. It is made from non-leaching marine board which I cut into strips and weaved a hard basket. The ends are tied together with polythylene, woven monofilament.