sample collection, upon any irritation or offensive manipulation
(for example dissection) the black sea urchin starts to
release its gametes immediately (personal observation). Such
behavior was never observed in the other three sea urchins:
the purple, the brown and the green. Another important feature
that differentiated the black sea urchin was that it was
not edible and this was also recorded by (Vielmini et al.,
2005; Wangensteen, 2013) as its gonads tasted bitter.