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Epinephelus marginatus, commonly known as the Dusky Grouper or Mero, is a large, robust marine fish belonging to the family Serranidae. It is a highly prized species, both commercially and recreationally, known for its impressive size, longevity, and distinctive coloration. This species is a protogynous hermaphrodite, meaning individuals mature as females and later transition to males. They are solitary and territorial predators, playing a significant role in their benthic ecosystems.
Fyysiset ominaisuudet
- Ruumiinmuoto
- torpedo
- Väritys
- Adults typically exhibit a mottled brown to reddish-brown background coloration, often with irregular pale blotches and spots that can change intensity depending on the environment and stress levels. The ventral side is usually lighter. Juveniles are often more distinctly patterned with dark bands and lighter areas.
- Suomutyyppi
- ctenoid
- Suun asento
- terminal
- Erottuvat piirteet
- Robust, elongated body with a large head and mouth., Thick, fleshy lips., Three to five rows of teeth on the mid-side of the lower jaw., Rounded caudal fin in adults, slightly emarginate in juveniles., Preopercle finely serrated, with a distinct notch above the angle., Operculum with three flat spines, the middle one being the largest.
- Selkäevä
- Single dorsal fin with XI spines and 13-16 soft rays. The spiny and soft-rayed portions are continuous, with the spiny part being lower than the soft-rayed part.
- Pyrstöevä
- Rounded in adults, slightly emarginate in juveniles. Dark with a pale margin.
- Rintaevä
- Large and rounded, typically longer than the pelvic fins. 17-19 rays.
- Erottuvat evät
- Pelvic fins are relatively short, inserted just behind the pectoral fin base. Anal fin has III spines and 8-9 soft rays.
Tunnistusvinkit
Body Coloration and Pattern
Look for the mottled brown to reddish-brown body with irregular pale blotches and spots. The intensity of these markings can vary.
Caudal Fin Shape
Adults have a distinctly rounded caudal fin, often with a pale margin. Juveniles may have a slightly emarginate (indented) caudal fin.
Preopercle
Examine the preopercle (bone covering the gill arch). It is finely serrated with a noticeable notch above the angle.
Mouth and Lips
Note the large mouth with thick, fleshy lips and the presence of three to five rows of teeth on the mid-side of the lower jaw.
Size
Adults can reach impressive sizes, up to 150 cm (59 inches) in total length and over 60 kg (132 lbs) in weight, though typically observed between 50-100 cm.
Elinympäristö
- Vesityyppi
- saltwater
- Syvyys
- Typically found from 8 to 300 meters (26 to 984 feet), but most commonly observed between 10 and 60 meters (33 to 197 feet).
- Ympäristö
- Prefers rocky bottoms, caves, shipwrecks, and other complex hard-bottom habitats. Juveniles may inhabit shallower coastal areas, including seagrass beds and estuaries, before moving to deeper rocky reefs as they mature. They are solitary and territorial, often occupying a specific den or crevice.
- Maantieteellinen levinneisyys
- Widely distributed in the Eastern Atlantic Ocean, including the Mediterranean Sea, and along the coasts of Africa from Senegal to South Africa. Also found in the Western Indian Ocean, including Madagascar and the Mascarene Islands, and extending to the coast of Brazil in the Western Atlantic.
Akvaariotiedot
- Hoitotaso: expert
- Luonne: aggressive
- Ruokavalio: carnivore
- Akvaarion vähimmäiskoko: 2000 gallons (7570 liters) for adults
- Lämpötila: 18-24°C (64-75°F)
- pH-taso: 8.1-8.4
- Kovuus: 8-12 dKH
- Yhteensopivuus: Not suitable for community tanks. Can be kept with other very large, robust, and equally aggressive fish, but typically best kept alone or in very large, species-specific exhibits.
- Erityisvaatimukset: Requires an extremely large aquarium with ample rockwork for hiding and territorial establishment. Excellent filtration is crucial due to their large size and predatory diet. Live food or large chunks of frozen seafood are necessary. Not recommended for home aquaria due to their size and specific needs.
Tietoa luonnonvaraisista
- Suojelustatus: endangered
- Kausivaihtelu: Spawning typically occurs during summer months (June-August in the Northern Hemisphere, December-February in the Southern Hemisphere), with aggregations forming in specific areas. Fishing pressure often increases during these periods.
- Markkinahinta: High, varies significantly by region and size
- Kaupallinen merkitys: high
- Maku: Mild, firm, white flesh with a delicate flavor.
- Rakenne: Firm, flaky, and moist.
- Valmistustavat: Grilled, Baked, Pan-fried, Steamed, Roasted
- Ravintoarvo: Excellent source of lean protein, low in fat, and contains essential vitamins and minerals.
Avaintiedot
Protogynous Hermaphroditebehavior
Epinephelus marginatus is a protogynous hermaphrodite, meaning all individuals mature first as females and later, typically around 10-12 years of age and larger sizes, transition into males. This reproductive strategy is common among many grouper species.
Long Lifespanrecord
Dusky Groupers are known for their impressive longevity, with individuals recorded living for over 50 years. This slow growth and late maturation make them particularly vulnerable to overfishing.
Territorial Predatorbehavior
These groupers are solitary and highly territorial predators. They establish a home range, often centered around a specific cave or crevice, which they defend against intruders. Their diet consists primarily of fish, crustaceans, and cephalopods.
Conservation Concerninteresting
Due to overfishing, habitat degradation, and their life history characteristics (slow growth, late maturation, protogynous hermaphroditism), the Dusky Grouper is classified as 'Endangered' by the IUCN Red List.
Spawning Aggregationsbehavior
During spawning season, Dusky Groupers form temporary aggregations at specific sites, making them highly susceptible to targeted fishing pressure during these vulnerable periods.
Turvallisuustiedot
Käsittele varoen- Turvallisuustaso: caution
- Myrkyllinen: Ei
- Syötävyys: edible
- Käsittelyohjeet: Dusky Groupers are powerful fish with strong jaws and sharp teeth. Care should be taken when handling them, especially larger specimens, to avoid bites. Their dorsal fin spines are sharp and can inflict painful punctures, though they are not venomous. Always use appropriate gear (gloves, lip grippers) if handling. Release practices should minimize stress to ensure survival.
Samankaltaiset lajit
White Grouper
Epinephelus aeneus
E. aeneus typically has a lighter, grayish-white body with 5-7 vertical dark bars that are more distinct than the blotches of E. marginatus. Its caudal fin is usually truncate (straight) or slightly emarginate, not rounded like the adult Dusky Grouper. The preopercle of E. aeneus is more coarsely serrated.
Goldblotch Grouper
Epinephelus costae
E. costae is generally lighter in color, often yellowish-brown, and lacks the distinct mottled pattern of E. marginatus. It typically has a series of small, dark spots on the head and body, and a more pointed snout. The caudal fin is truncate or slightly emarginate.
Malabar Grouper
Epinephelus malabaricus
While also a large grouper, E. malabaricus has a distinct pattern of dark brown spots and blotches, often with larger, more defined dark patches, and sometimes white spots. Its geographic range overlaps in some areas, but its overall appearance is generally more patterned and less uniformly mottled than E. marginatus.
Tieteellinen luokitus
- Kunta
- Animalia
- Pääjakso
- Chordata
- Luokka
- Actinopterygii
- Lahko
- Perciformes
- Heimo
- Serranidae
- Suku
- Epinephelus
- Laji
- Epinephelus marginatus
Tutustu lajiin Dusky Grouper
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