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Red hind grouper female specimen in the spawning stage. (Photo Credit: University of Puerto Rico/NOAA)

Research looks into Caribbean fish spawning grounds

Click on the flag for more information about United States UNITED STATES
Wednesday, February 27, 2013, 23:30 (GMT + 9)

National Oceanic and Atmospheric Administration- (NOAA) funded research in the Caribbean is using the underwater sounds of reef fish, such as groupers, to identify areas where they gather to spawn — a behavior that makes the fish easier to catch and susceptible to overfishing. The research may lead to more precise measures to protect spawning locations and thereby allow a depleted fish population to rebuild.

Scientists at the University of Puerto Rico, working with Caribbean resource managers, are conducting the current research in an effort to protect populations of commercially and recreationally important grouper, one of the most valuable fisheries in the region. Groupers were once one of the most important species found in the fisheries within Puerto Rico. In 1975 the catch totalled 980,000 lb, but since then it has steadily declined such that in 2005 it was less than 83,000 lb, a reduction of more than 90 per cent.

Groupers and other fish make characteristic sounds when they gather to spawn. By recording these sounds with an underwater microphone, either lowered from a boat or mounted on the bottom, scientists can tell not only where the fish are, but also when they are there and how many fish there are. 

The research may allow the technique to be expanded in the future to other species’ spawning areas. Protecting spawning locations is a critical element in recovery of depleted populations.

This research technique has high potential to aid not only in the protection and restoration of fish species in shallow water coral reef ecosystems, but it is also being employed in NOAA-funded research at UPR on largely unexplored deeper water coral reef ecosystems, that includes species such as yellowfin and black grouper.

“This research is of keen interest to the Caribbean Fishery Management Council in its efforts to preserve and restore depleted fish stocks in the Caribbean,” said Richard Appeldoorn, PhD, director of the Caribbean Coral Reef Institute (CCRI). “Fish spawning aggregations are critical to the survival of many reef species in the Caribbean Basin.”

A research team, working through CCRI at the University of Puerto Rico, led this research in partnership with the University of South Florida and NOAA Fisheries. The findings were presented in the August 2012 issue of Marine Ecology Progress Series. 

 

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