Today, when I looked through the microscope I saw that my sea urchins were still alive and moving, I was surprised and in awe, because they survived in a colder temperature than that of their parents. I later found that the sea urchins were in the pluteus larva stage. This farther peaked my interest and I began to wonder if I would be able to farm sea urchins and how long it would take for then to reach juvenile stage. I found that it would take about 40 to 45 days for them to go into the metamorphosis stage. I believe they can develop into fully mature sea urchins however, due to the length of their development and the limitations of their environment they have a small percentage of surviving.
http://www.asnailsodyssey.com/LEARNABOUT/URCHIN/urchRepr.php
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