This morning at northwest point we observed a group of Giant Barrel Sponges, Xestospongia muta, releasing sperm. The spawning occurred in all individuals in the area at depths of 10 to 15 meters and occurred from 9.30 to 10.30 in the morning, but we observed only males. These sponges are common on Caribbean coral reefs and can reach sizes of up to 6 feet. However, little is known about reproduction in the species. In 2004, Williams et al sighted a spawning event in Belize, which took place on March 30th in the early morning hours. In previous years, the Leathery Barrel Sponge, Geodia neptuni, has also been observed spawning at Navassa during the fall season.
Reef and Fishery Assessment of Navassa Island National Wildlife Refuge
On April 23, 2009 scientists from the NOAA's Southeast Fisheries Science
This work is funded by the NOAA Coral Reef Conservation Program.
Thursday, April 30, 2009
Spectacular sponges spawn sperm
This morning at northwest point we observed a group of Giant Barrel Sponges, Xestospongia muta, releasing sperm. The spawning occurred in all individuals in the area at depths of 10 to 15 meters and occurred from 9.30 to 10.30 in the morning, but we observed only males. These sponges are common on Caribbean coral reefs and can reach sizes of up to 6 feet. However, little is known about reproduction in the species. In 2004, Williams et al sighted a spawning event in Belize, which took place on March 30th in the early morning hours. In previous years, the Leathery Barrel Sponge, Geodia neptuni, has also been observed spawning at Navassa during the fall season.
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