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Sea Urchins Spawning
Spawning sea urchins (as evidenced by their upward pointing spines) and a catshark seen off southern Puerto Rico at a depth of 471 meters (1,545 feet) during Exploration of Deepwater Habitats off Puerto Rico and the U.S. Virgin Islands for Biotechnology Potential.
Credit

Image courtesy of Exploration of Deepwater Habitats off Puerto Rico and the U.S. Virgin Islands for Biotechnology Potential.