Prevent dredging and trawling and activities which damage kelp beds.

They were loafing in their kelp beds, all eyelashes, attitude and blubber.

Fish such as bass and thornback rays have returned to the cleaner sea along with kelp beds, colourful anemones, seals and even basking sharks in summer.

For now, it remains to be seen if divers can harvest urchins so efficiently and thoroughly that they can help restore kelp beds while still turning a profit.

The findings are applicable to any coastal areas where there are extensive kelp beds.