Denizens

Elsewhere we watch large ocean predators and tiny denizens of the sea like the strangely alien nudibranch and Christmas tree worms.

Kaplan says the low cost recorders can revolutionize how and how often we monitor reefs, and how we determine their health. He says this tool can help gather critical information, regulate boat traffic and even aid in rebuilding the reef ecosystem, by broadcasting sounds that will attract new denizens.