Brown-marbled grouper

The brown-marbled grouper or tiger grouper (Epinephelus fuscoguttatus) is a benthic marine fish which belongs to the family Serranidae or also known as the groupers.

Tiger grouper
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Serranidae
Subfamily: Epinephelinae
Genus: Epinephelus
Species:
E. fuscoguttatus
Binomial name
Epinephelus fuscoguttatus
(Forsskål, 1775)
Synonyms[2]
  • Perca summana fuscoguttata Forsskål, 1775
  • Serranus fuscoguttatus (Forsskål, 1775)
  • Serranus horridus Valenciennes, 1828
  • Serranus taeniocheirus Valenciennes, 1830
  • Serranus lutra Valenciennes, 1832
  • Epinephelus lutra (Valenciennes, 1832)

Description

Epinephelus fuscoguttatus is a medium-sized fish which grows up to 120 cm, but the average size mostly observed is 50 cm.[2] Its body has a stocky and robust aspect, is compressed laterally and has a sharp profile for the head. The mouth is big and has a superior position with many small teeth and canine in front. The background coloration is pale yellowish-brown with many irregular in size and shape dark brown or Grey blotches. The body is also covered with many small dark brown spots. All the fins are large and round.

The brown-marbled grouper can be easily confused with its close relative Epinephelus polyphekadion. The differences are more obvious on adults specimen. The distinctive characters of the brown-marbled grouper are: a small black saddle on the top of caudal peduncle, when observed on the side a notch above the eyes and the front head is clearly visible, its body is quite thick from the front of the dorsal fin to the bottom of the fish below the pectoral fins.[3]

Distribution and habitat

It is widely distributed throughout the tropical and subtropical waters of the Indo-Pacific, from eastern coasts of Africa to the oceanic islands of the centre of the Pacific Ocean, Red Sea included. However, it is absent from the Persian Gulf, Hawaii and French Polynesia.[2]

Like many of the groupers, the brown-marbled grouper lives in rich clear waters close to coral or rocky reefs, lagoons and external slopes from the surface until 60 metres (200 ft) depth.[4]

Feeding

The brown-marbled grouper is carnivorous and its diet consists mainly in fishes, crustaceans and cephalopods, it is an ambush predator.[5]

Behavior

This grouper is solitary, sedentary, it defends a well defined territory, benthic and has an nocturnal which can be maximal at sunrise and/or at sunset.[6]

It has a quite long life span for a fish, it can expect to live until at least 40 years old.[7]

It is protogynous hermaphrodite, which means the female can evolved to male during its life.

Protection

The brown-marbled grouper is listed "Vulnerable" on the IUCN Red List of Threatened Species since 2004. Because of its size and hardiness, this species has a height commercial interest for the live food fish trade.

However, its biological characteristics make this species particularly vulnerable to over-fishing. Especially during mating periods at specific times and places, the brown-marbled grouper forms spawning aggregations which are easy and attractive targets for fishermen. The quite long life span of this grouper and its poor population density in reefs in the wild result in a weak and slow population regeneration capacity. Furthermore, brown-marbled groupers are greatly threatened by the trend of fishermen to target large fish. That concerns especially males so if the sex ratio between males and females is falling, it will affect the fertilization capacity of the species. It will have the same result on over-fishing females breeders that are highly fertile and would not be able to actively contributing to maintain the proportion of young in the population.

Brown-marbled groupers can be cultured by hatcheries but these installations are still getting fishes straight from the wild. This method has also a negative effect on the global population because all the groupers catch in any size category are kept and grown until they reach market size.

One fact helps to preserve a bit the brown-marbled groupers in some geographic areas and it is the ciguatera which affects its flesh.

Over the last few years, some protective measures or/and sustainable fishing methods have been taken by many states where spawning aggregation are known like in Indonesia, Papua New Guinea, Australia, Malaysia, Solomon Islands and Palau.[8][1]

References
  1. Rhodes, K.; Sadovy, Y.; Samoilys, M. (2018). "Epinephelus fuscoguttatus". IUCN Red List of Threatened Species. 2018: e.T44673A100468078. doi:10.2305/IUCN.UK.2018-2.RLTS.T44673A100468078.en. Retrieved 6 July 2020.
  2. Froese, Rainer and Pauly, Daniel, eds. (2019). "Epinephelus fuscoguttatus" in FishBase. December 2019 version.
  3. Introduction to Monitoring and Management of Spawning Aggregations and Aggregation Sites for Three Indo-Pacific Grouper Species (Epinephelus fuscoguttatus, Epinephelus polyphekadion, and Plectropomus areolatus), THE NATURE CONSERVANCY, Indo-Pacific Draft Field Manual, June 2003, http://www.reefresilience.org/pdf/manual_field_practitioners.pdf
  4. Lieske, E. and R. Myers, 1994. Collins Pocket Guide. Coral reef fishes. Indo-Pacific & Caribbean including the Red Sea. Harper Collins Publishers, 400 p.
  5. Lieske & Myers,Coral reef fishes,Princeton University Press, 2009, ISBN 9780691089959
  6. Brulé & Déniel, ‘’ Expose synoptique des données biologiques sur le mérou rouge Epinephelus morio (valenciennes, 1828) du Golfe du Mexique’’, F.A.O., 1994,ISBN 9252034633
  7. Pears, R.J., J.H. Choat, B.D. Mapstone and G.A. Begg, 2006. Demography of a large grouper, Epinephelus fuscoguttatus, from Australia's Great barrier reef: implications for fishery management. Mar. Ecol. Prog. Ser. 307:259-272.
  8. http://eol.org/pages/209732/details#conservation
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