I joined a sea urchin harvesting adventure at Salt Point out of curiosity. I wanted to taste uni from our ocean. It was there that I learned how purple sea urchins, native to this coast, have grown so numerous that they are beginning to unsettle the balance of the reef. Sea urchins are not invasive. They have always been part of our waters. For a long time, their numbers were kept in balance by sea otters moving through the kelp and by abalone sharing the slow work of grazing