Atlantic goliath grouper (Epinephelus itajara)

loading
Atlantic goliath grouper swimming
loading
Loading more images and videos...

Atlantic goliath grouper fact file

Atlantic goliath grouper description

KingdomAnimalia
PhylumChordata
ClassActinopterygii
OrderPerciformes
FamilySerranidae
GenusEpinephelus (1)

The Atlantic goliath grouper (Epinephelus itajara) is one of the largest members of the sea bass family. Its body is large and stocky, measuring half as wide as it is long. The head is broad with small eyes and the pectoral fins and tail fins are rounded. The first and soft dorsal fins are joined together along the back of the fish, and the bases of the first dorsal fin and anal fin are covered with scales and thick skin (2) (3).

Atlantic goliath groupers are dull green, grey, or dark yellow to brown, with small dark spots on the head, body and fins. Smaller individuals of less than one metre long are more decorative, with three or four faint vertical bars on their sides. Juveniles are tawny-coloured with dark banding and blotching. This predatory fish has several rows of small teeth in the jaw and small ‘pharyngeal’ teeth (2) (3).

Also known as
black bass, esonue grouper, giant seabass, goliath grouper, guasa, hamlet, jewfish, southern jewfish, spotted jewfish.
Synonyms
Promicrops ditobo, Promicrops esonue, Promicrops itajara, Serranus galeus, Serranus guasa, Serranus itajara, Serranus mentzelii, Serranus quinquefasciatus.
French
Mérou Géant, Têtard.
Spanish
Cherne, Guato, Guaza, Mero Batata, Mero Pintado, Mero Sapo.
Size
Length: up to 2.5 m (3)
Weight
up to 360 kg (3)
Top

Atlantic goliath grouper biology

The Atlantic goliath grouper may be solitary or occur in groups of up to 50 or more individuals. Its home range appears limited and the fish produces a booming sound when threatened by divers or large sharks. Variations of these vocalizations also undoubtedly have intraspecific communicative properties (3).

During the breeding season, from July through September, Atlantic goliath groupers gather together at breeding sites in groups of 100 individuals or more, for periodic spawning. The fertilised eggs are scattered in the water column and develop into kite-shaped larvae with long dorsal fin spines and pelvic fin spines (2) (3). About a month or more after hatching, the larvae mature into juveniles of just 2.5 centimetres long and settle preferentially into mangrove habitat (2) (3).

These fish are very long-lived, with a slow growth rate and late sexual maturation. Males begin breeding at four to six years and females mature at six to seven years. However, if the Atlantic goliath grouper is like most other groupers, it may undergo a sex-change part way through life, starting out as a female and becoming male at some later time, although this has never been observed in this species (2).

The Atlantic goliath grouper feeds on crustaceans, such as spiny lobsters, shrimps and crabs, as well as fish including stingrays and parrotfish, in addition to octopuses and young sea turtles. Despite having teeth, the fish engulfs its prey and swallows it whole. Before the Atlantic goliath grouper reaches full size it is susceptible to the attack of barracuda, king mackerel and moray eels, as well as sandbar sharks and hammerhead sharks (2). Once it is fully grown, humans and large sharks are the Atlantic goliath grouper’s only predators (2) (3).

Top

Atlantic goliath grouper range

The Atlantic goliath grouper is found in the eastern Atlantic Ocean from Senegal to Congo, as well as in the western Atlantic Ocean from Florida to Brazil, including the Gulf of Mexico and the Caribbean Sea. It is reportedly rare around the Canary Islands (2) (4).

A separate population of goliath groupers in the eastern Pacific Ocean has now been classified as a separate species, the Pacific goliath grouper (Epinephelus quinquefasciatus) (1).

See this species on Google Earth.

Top

Atlantic goliath grouper habitat

This marine fish inhabits shallow, inshore waters with mud, rock or coral bottoms and is infrequently found below depths of 46 metres. Juveniles inhabit mangroves and associated structures for the first four to six years of their lives, then move to offshore reefs when they reach about one metre in length (3). Adults prefer structured habitat, such as rocky ledges, caves, and ship wrecks (1) (2) (3) (4).

Top

Atlantic goliath grouper status

The Atlantic goliath grouper is classified as Critically Endangered (CR) on the IUCN Red List (1).

IUCN Red List species status – Critically Endangered

Top

Atlantic goliath grouper threats

The Atlantic goliath grouper is particularly prone to over-fishing because of its large size, slow growth rate, low reproductive rate and group spawning activity. The fish has excellent quality flesh and has been at risk of spear-fishing for recreation and sport (2) (4).

Top

Atlantic goliath grouper conservation

During the 1980s there was an observed reduction in numbers within spawning aggregations of the Atlantic goliath grouper, dropping from over 100 individuals per location to fewer than 10 individuals, and numbers were suspected to have been reduced by 80 percent. This prompted legislative protection preventing fishing of this species. In the ten years following the implementation of the legislation, numbers of individuals in each spawning aggregation rose to between 20 and 40 individuals (2).

View information on this species at the UNEP World Conservation Monitoring Centre.
Top

Find out more

Find out more about the Atlantic goliath grouper:

Top

Authentication

Authenticated (04/07/2006) by Dr. Chris Koenig, Florida State University Coastal and Marine Laboratory (FSUCML); and member of the IUCN/SSC Grouper/Wrasse Specialist Group.
http://www.marinelab.fsu.edu/faculty/koenig.html

Top

Glossary

Anal fin
In fish, an unpaired fin on the under surface of a fish, behind the anus.
Crustaceans
Diverse group of animals with jointed limbs and a hard chitinous exoskeleton, characterised by the possession of two pairs of antennae, one pair of mandibles (mouthparts used for handling and processing food) and two pairs of maxillae (appendages used in eating, which are located behind the mandibles). Includes crabs, lobsters, shrimps, woodlice and barnacles.
Dorsal fin
The unpaired fin found on the back of the body of fish, or the raised structure on the back of most cetaceans (whales, dolphins and porpoises).
Fertilisation
The fusion of gametes (male and female reproductive cells) to produce an embryo, which grows into a new individual.
Home range
The area occupied by an animal during routine activities, which is not actively defended.
Larvae
Stage in an animal’s lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
Pectoral fins
In fish, the pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.
Pelvic fins
In fish, the pair of fins found on the underside of the body.
Spawning
The production or depositing of eggs in water.
Top

References

  1. IUCN Red List (February, 2013)
    http://www.iucnredlist.org/
  2. Ichthyology Department, Florida Museum of Natural History - Goliath grouper (October, 2004)
    http://www.flmnh.ufl.edu/fish/Gallery/Descript/GoliathGrouper/GoliathGrouper.html
  3. Koenig, C. (2006) Pers. comm.
  4. FishBase - Epinephelus itajara (February, 2013)
    http://www.fishbase.org/summary/Epinephelus-itajara.html
X
Close

Image credit

Atlantic goliath grouper swimming  
Atlantic goliath grouper swimming

© Michael Patrick O'Neill / www.photoshot.com

NHPA/Photoshot Holdings Ltd
29-31 Saffron Hill
London
EC1N 8SW
United Kingdom
Tel: +44 (0) 20 7421 6003
Fax: +44 (0) 20 7421 6006
sales@photoshot.com
http://www.photoshot.com

X
Close

Link to this photo

ARKive species - Atlantic goliath grouper (Epinephelus itajara) Embed this ARKive thumbnail link ("portlet") by copying and pasting the code below.

Terms of Use - The displayed portlet may be used as a link from your website to ARKive's online content for private, scientific, conservation or educational purposes only. It may NOT be used within Apps.

Read more about

X
Close

MyARKive

MyARKive offers the scrapbook feature to signed-up members, allowing you to organize your favourite ARKive images and videos and share them with friends.

Play the Team WILD game:

Team WILD, an elite squadron of science superheroes, needs your help! Your mission: protect and conserve the planet’s species and habitats from destruction.

Conservation in Action

Which species are on the road to recovery? Find out now »

Help us share the wonders of the natural world. Donate today!

Blog