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Nassau Grouper

These fish can change their color and pattern depending on their mood and it’s the main way they communicate with other fish!

 

Nassau groupers are found in the western Atlantic, in the Gulf of Mexico and throughout the Caribbean. Adults live mostly in clear water coral reef habitat along steep slopes or rocky substrate. While these fish range from tawny to pinkish red with 5 dark unevenly spaced bars on their body, they can change their colors depending on mood or behavior! This change of coloration is the main way that these fish communicate with each other. For example, when two of these fish meet, they might change their color to show aggression towards each other, or when an individual is ready to spawn, they usually become bicolor, darker, or incorporate a white belly.

This fish has unique coordinated spawning events where they migrate, up to 200 kilometers (125 miles) to specific areas, typically to coral reef drop offs. Hundreds to tens of thousands of individual Nassau groupers come together for spawning season, during which they have been recorded regularly descending into deeper waters. This spawning event happens just once a year. Once eggs hatch, they undergo a brief larval stage that lasts just over a month before they grow mature into juveniles, although it is 4 to 8 years until they reach sexual maturity. As adults, Nassau groupers eat a variety of prey, including smaller fish, crab, shrimp, and lobsters. When they eat their prey, they open their large mouths around their meal and move their gills in a special way to create suction that sucks their prey into their mouth. As they are quite large fish, Nassau groupers don’t have many predators, but they may be occasionally attacked by sharks as well as moray eels, and yellowfin snappers which are known to eat their eggs.

 

 

The Nassau grouper faces several serious threats that have led it to be listed as “Critically Endangered” on the IUCN Red List.

Overfishing

This fish is threatened by overfishing because of its high values in commercial and recreational fishing. Its populations have declined substantially across their range, particularly the targeting of spawning events where thousands of individuals gather.

Coral Reef Loss and Degradation

These fish also experience threats from loss of coral reef habitat in recent years, mainly because of human activities, coral disease, declines in key reef species, and climate change. Additionally, Nassau grouper young can be threatened by predation from lionfish, which are an invasive species in the area where these fish live.

 

 

As a result of population declines from heavy fishing pressure, multiple countries have either reduced or completely banned the fishing of the Nassau grouper. For example, starting in 1992 in the continental United States, fishing for or possessing Nassau grouper is prohibited. Strict protections like these are critical to the survival of these fish. Additionally, Nassau groupers rely on marine habitats such as coral, that are experiencing loss and degradation. Learn more about how Oceana is campaigning for responsible fishing practices to stop overfishing and protecting coral habitats.

 

 

 

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