Rabbits to the Rescue

The overpopulation of rabbits to any landscape is devastating, the overpopulation of rabbit fish in the ocean, especially the coral reef is comforting. The reason coral is dying out is because excess algae is resting on the organisms and suffocating it. Think of your goldfish tank with no filter. And the reason the algae is so overgrown is solely due to an increase in human activity.
"When a coral reef is weakened or damaged through human activity such as climate change or pollution or by a natural disaster like a cyclone, the coral will usually recover provided it is not choked by fast-growing marine algae," explains Professor David Bellwood of the ARC Centre of Excellence for Coral Reef Studies and James Cook University.
Where original coral grazers, the parrot fish and surgeon fish, fail to consume large amounts of algae, the rabbit fish thrive. The rabbit fish were caught on underwater videocams, in schools of up to 15 fish, grazing the crest, slopes and outer flats of the reef, and chomping away at more than ten times the rate of the other weed-eaters. Parrot fish tend to become intimidated by large amounts of algae and prefer to consume new growth.
Rabbit fish, who have never inhabited the coral reefs before, now play a crucial role in not only the survival but the maintenance of coral ecosystems, and should not be overlooked. Source.