Spotted grunt

Handle with care

Pomadasys macracanthus

Also known as: Bigspine grunt, Spotted javelin fish, Spotted sweetlips

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Description

Pomadasys macracanthus, commonly known as the Spotted grunt, is a medium-sized marine fish belonging to the family Haemulidae. It is characterized by its silvery body adorned with distinct dark spots, particularly on the upper flanks and fins. This species is known for its nocturnal feeding habits and the 'grunting' sound it produces by grinding its pharyngeal teeth, amplified by the swim bladder.

Physical Characteristics

Body shape: compressed
Coloration: Silvery-grey body, often with a darker dorsal surface and lighter belly. Distinctive dark spots are scattered over the upper flanks, dorsal fin, and caudal fin. Some individuals may exhibit faint vertical bars.
Scale type: ctenoid
Mouth position: terminal
Distinctive features: Large, prominent dark spots on the body and fins., Relatively large eyes., Thick lips., Strong, spiny dorsal fin.
Dorsal fin: Single dorsal fin, deeply notched, with 12-13 strong spines followed by 13-15 soft rays. The spines are notably robust.
Tail fin: Caudal fin is moderately forked.
Pectoral fin: Pectoral fins are relatively long and pointed.
Distinctive fins: Anal fin with 3 strong spines and 7-8 soft rays. The second anal spine is typically very long and robust, a key diagnostic feature.

Identification Tips

Spotting Pattern

Look for prominent, irregularly shaped dark spots on the upper half of the body, extending onto the dorsal and caudal fins. The intensity and distribution of spots can vary but are always present.

Second Anal Spine

Examine the anal fin; the second spine is notably thick and long, often longer than the third spine, which is a crucial distinguishing characteristic for this species within the genus Pomadasys.

Body Shape and Color

Observe the compressed, silvery-grey body. While other grunts may be silvery, the distinct spotting pattern combined with the robust anal spine helps confirm identification.

Habitat

Water type: saltwater
Depth: Typically found in depths ranging from 1 to 75 meters (3 to 246 feet), but most commonly in shallower coastal waters.
Environment: Inhabits coastal waters, often associated with sandy or muddy bottoms, seagrass beds, and rocky reefs. Juveniles may be found in estuaries and mangrove areas.
Geographic range: Indo-West Pacific: Red Sea and East Africa to Samoa, north to southern Japan, south to northern Australia. Also reported from the eastern Mediterranean via the Suez Canal (Lessepsian migrant).

Aquarium Information

Care level: intermediate
Temperament: semi-aggressive
Diet: carnivore
Minimum tank size: 180 gallons
Temperature: 22-26°C (72-79°F)
pH level: 8.1-8.4
Hardness: 8-12 dKH
Compatibility: Can be kept with other robust, similarly sized fish. Avoid very small or overly aggressive tank mates.
Special requirements: Requires a well-established tank with plenty of hiding spots and open swimming areas. A sand substrate is preferred as they may sift through it. Good filtration is essential due to their carnivorous diet.

Wild Information

Conservation status: least concern
Seasonality: No specific seasonal restrictions for fishing, but local regulations may apply.
Market price: Moderate
Commercial importance: medium
Taste: Mild, slightly sweet
Texture: Flaky, firm white flesh
Cooking methods: Frying, Grilling, Baking, Steaming
Nutritional value: Good source of protein and omega-3 fatty acids.

Key Facts

Nocturnal Foragerbehavior

Spotted grunts are primarily nocturnal feeders, emerging from their daytime resting spots to forage for benthic invertebrates and small fish under the cover of darkness.

Grunting Soundinteresting

Like other grunts, Pomadasys macracanthus can produce a characteristic 'grunting' sound by grinding its pharyngeal teeth. This sound is amplified by its swim bladder and is thought to be used for communication, especially during spawning or when alarmed.

Lessepsian Migrantevolution

This species has successfully migrated from the Red Sea into the Mediterranean Sea via the Suez Canal, establishing populations in new territories, a phenomenon known as Lessepsian migration.

Robust Anal Spineinteresting

The exceptionally strong and long second anal fin spine is a key morphological feature that helps distinguish the Spotted grunt from many other grunt species.

Safety Information

Handle with care

Safety level: caution
Venomous: No
Edibility: edible
Handling notes: While not venomous, the Spotted grunt possesses strong, sharp spines in its dorsal and anal fins. Care should be taken when handling to avoid painful punctures. Use gloves or a fish gripper if possible.

Similar Species

Javelin Grunt

Pomadasys kaakan

P. kaakan generally has fewer, larger spots or blotches, often arranged in longitudinal rows, and its second anal spine is typically not as robust or elongated as in P. macracanthus. The overall body shape can also be slightly different.

Silver Grunt

Pomadasys argenteus

P. argenteus lacks the distinct dark spots on the body and fins, having a more uniformly silvery coloration. Its second anal spine is also less developed compared to P. macracanthus.

Smallspotted Grunt

Pomadasys commersonnii

P. commersonnii has smaller, more numerous spots, often forming faint lines, and its second anal spine is not as prominently large and strong as in P. macracanthus.

Scientific Classification

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Haemulidae
Genus: Pomadasys
Species: macracanthus

Explore Spotted grunt

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