‘Grouper Moon’ takes on critical importance

23 January – The Department of Environment (DoE), partnering with the Reef Environmental Education Foundation (R.E.E.F.), has resumed its annual ‘Grouper Moon’ research project in the Cayman Islands and work on that project will continue into next month.

The project, which started in the mid-1980’s and  dubbed ‘Grouper Moon’ when the REEF partnership began in 2002, has taken on a special significance this year with the recent change in designation of the Nassau grouper from endangered to critically endangered species by the International Union for Conservation of Nature (IUCN). ‘Critically endangered’ is the strongest warning the IUCN can issue, indicating that a species is facing an extremely high risk of extinction in the wild.

Based on its research, the IUCN believes the Nassau grouper population has declined globally by more than 80 per cent since 1980.

A grouper spawning aggregation in Little Cayman during February 2018. Photo: Berkley White

Despite the IUCN critically endangered species designation, DoE and REEF research conducted in the Cayman Islands over the past decade has shown a noticeable resurgence in the Sister Islands’ Nassau grouper population, particularly off the coast of Little Cayman, where one spawning site (often referred to as a spawning aggregation) monitored by scientists saw more than 6,500 grouper return in January/February 2018. The same site recorded fewer than 2,000 grouper a decade ago. A separate spawning site off Cayman Brac counted nearly 1,000 grouper last year after earlier counts came in at roughly half that number.  

“It’s not nearly enough to take the species off the IUCN critically endangered list or to relax local protections for the species. We have yet to see a similar resurgence in Grand Cayman,” said DoE Research Officer Bradley Johnson. “But it is encouraging data and it highlights the importance of adhering to, and enforcing, Nassau grouper fishing restrictions set under the National Conservation Law (NCL).”  

The current closed season for Nassau grouper in Cayman Islands waters began 1 December, 2018 and will last until 30 April, 2019. During the closed season anyone who takes, purchases, receives, offers for sale, exchanges or donates Nassau grouper commits an offence under the NCL. In addition, anyone who possesses or permits another person to take Nassau grouper (Epinephelus striatus) from Cayman waters during the closed season commits an offence.

“We still hear occasional reports of Nassau grouper being caught during the closed season and the public must understand that fishing restrictions on the species have changed over the years,” Minister of Environment, the Hon. Dwayne Seymour said. “The recent ‘critically endangered’ designation for Nassau grouper shows we did the right thing protecting them locally. It also makes it even more important for both Caymanian fishermen and visitors to respect the law and release any Nassau grouper they catch during the closed season.”

Fishermen who inadvertently catch Nassau grouper during closed season should release them alive, even if the grouper is hurt during the catch. Using circle hooks, as opposed to J-hooks, can make the process of removing the hook from the fish’s mouth easier, as the circle hooks are designed to not hook in the stomach of the fish but rather in the mouth, making extraction less dangerous for the fish.

Anyone who witnesses, or who becomes aware of, Nassau grouper poaching during the closed season is asked to call 911 and may also contact DoE enforcement officers directly on Grand Cayman (916-4271), on Cayman Brac (call 911) or on Little Cayman (925-0185).

Scroll to Top