Here a coral with its large polyps exposed releases sperm into the water. (Photo: Brendan Holland)
An estimated one million people whale watch within Stellwagen Bank National Marine Sanctuary in Massachusetts every year during the peak months of April to October.
NOAA's National Ocean Service
N/MB6, SSMC4, Room 9149
1305 East-West Hwy
Silver Spring, MD 20910
Revised: June 22, 2015 | You are here: http://oceanservice.noaa.gov/education/tutorial_corals/media/supp_coral06b.html