Got a photo? Identify fish instantly with the Fishby app.
Open the appDescription
The Rubberlip grunt (Plectorhinchus mediterraneus) is a species of marine ray-finned fish belonging to the family Haemulidae, the grunts. It is characterized by its robust body, thick fleshy lips, and a generally silvery-grey to brownish coloration, often with darker spots or lines, especially in juveniles. This species is known for its nocturnal feeding habits and its ability to produce grunting sounds by grinding its pharyngeal teeth.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Adults are typically silvery-grey to brownish, often with a darker dorsal side fading to a lighter belly. Juveniles exhibit distinct dark spots or longitudinal stripes that fade with age. The fins are generally dusky or yellowish.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Thick, fleshy lips, giving it the 'rubberlip' moniker., Large eyes., Robust, compressed body., Small scales., Absence of a notch in the dorsal fin.
- Dorsal fin
- Single dorsal fin with 12-14 spines and 17-20 soft rays. No deep notch between spiny and soft parts.
- Tail fin
- Slightly forked caudal fin.
- Pectoral fin
- Relatively long pectoral fins.
- Distinctive fins
- Anal fin with 3 spines and 7-9 soft rays. Pelvic fins thoracic.
Identification Tips
Lips
The most distinguishing feature is its thick, fleshy, rubbery lips, which are noticeably larger than those of most other grunt species.
Coloration (Juveniles vs. Adults)
Juveniles have prominent dark spots or stripes that are absent or greatly reduced in adults. Adults are more uniformly silvery-grey to brownish.
Dorsal Fin
The dorsal fin is continuous, without a deep notch separating the spiny and soft-rayed portions, which can differentiate it from some other grunt species.
Body Shape
Its robust, compressed body is characteristic of the Plectorhinchus genus.
Habitat
- Water type
- saltwater
- Depth
- Typically found at depths ranging from 10 to 100 meters, occasionally deeper.
- Environment
- Inhabits rocky reefs, sandy bottoms, and seagrass beds, often near coastal areas. Juveniles may be found in shallower, more protected waters.
- Geographic range
- Eastern Atlantic Ocean, from Portugal south to Angola, including the Canary Islands, Madeira, and the Cape Verde Islands. Also present in the Mediterranean Sea, particularly the western and central parts.
Aquarium Information
- Care level: advanced
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: 500 gallons
- Temperature: 22-26°C (72-79°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Best kept in a large, species-specific tank or with other large, robust fish that can tolerate its semi-aggressive nature. Not suitable for reef tanks due to its predatory nature.
- Special requirements: Requires a large tank with ample swimming space and plenty of rockwork for hiding. A sand or fine gravel substrate is preferred as they may sift through it. Excellent filtration is essential due to their large size and feeding habits.
Wild Information
- Conservation status: least concern
- Seasonality: Spawning typically occurs during warmer months, but they are present year-round in their habitat.
- Market price: Varies by region, generally moderate to high for food fish.
- Commercial importance: medium
- Taste: Mild, firm white flesh.
- Texture: Flaky, firm.
- Cooking methods: baking, grilling, frying, steaming
- Nutritional value: Good source of protein and omega-3 fatty acids.
Key Facts
Nocturnal Feederbehavior
The Rubberlip grunt is primarily nocturnal, emerging from its daytime hiding spots to forage for benthic invertebrates and small fish under the cover of darkness.
Grunting Soundsinteresting
Like other grunts, Plectorhinchus mediterraneus can produce audible 'grunting' sounds by grinding its pharyngeal teeth, which is amplified by its swim bladder. This is often done when stressed or caught.
Dietary Shiftbehavior
Juvenile Rubberlip grunts often feed on smaller crustaceans and worms, while adults consume a wider variety of benthic invertebrates, including larger crustaceans, mollusks, and small fish.
Habitat Preferencebehavior
While found over various substrates, they show a preference for areas with structural complexity, such as rocky reefs, where they can find shelter during the day.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions beyond standard fish handling. Care should be taken with fin spines to avoid punctures, though they are not venomous.
Similar Species
Striped grunt
Plectorhinchus strigatus
P. strigatus typically has distinct horizontal stripes throughout its life, whereas P. mediterraneus juveniles have spots/stripes that fade, and adults are more uniformly colored. P. strigatus is also primarily Indo-Pacific.
Painted grunt
Plectorhinchus pictus
P. pictus has a more pronounced spotted pattern, especially as juveniles, and its adult coloration often retains some spotting or blotches. Its geographic range is also primarily Indo-Pacific.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Haemulidae
- Genus
- Plectorhinchus
- Species
- P. mediterraneus
Explore Rubberlip grunt
Identify fish anywhere
Free on iOS, Android, and Web. Photo identification, full species details, and more.