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The Black-faced Blenny (Tripterygion delaisi) is a small, benthic marine fish belonging to the family Tripterygiidae. It is characterized by its distinctive coloration, particularly the dark pigmentation on the head and anterior body, which is more pronounced in males. This species exhibits sexual dimorphism, with males displaying more vibrant breeding colors and specialized fin structures during reproduction. They are typically found in rocky coastal areas, often in shaded or dimly lit environments.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Males in breeding season exhibit a striking black head and anterior body, contrasting with a reddish-orange to brown posterior body. The dorsal fins are often edged with blue or white. Females and non-breeding males are generally more cryptic, with mottled brown and reddish patterns, often with dark bars or spots along the flanks. The eyes are relatively large.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Three distinct dorsal fins, Large eyes, Sexual dimorphism in coloration, especially during breeding, Dark pigmentation on the head and anterior body (more prominent in males)
- Dorsal fin
- Three separate dorsal fins. The first dorsal fin has 3 spines, the second has 10-12 spines, and the third has 7-9 soft rays. The first two dorsal fins are often elevated in males during courtship.
- Tail fin
- Rounded caudal fin.
- Pectoral fin
- Large, fan-like pectoral fins with 13-15 rays, often used for perching on substrates.
- Distinctive fins
- Pelvic fins are jugular (located anterior to the pectoral fins) with 1 spine and 2 soft rays, often appearing filamentous.
Identification Tips
Dorsal Fins
Look for the three distinct dorsal fins, a characteristic of the Tripterygiidae family. The first two are spiny, the third is soft-rayed.
Head Coloration (Males)
Breeding males are unmistakable with their intense black head and anterior body, contrasting with a reddish-orange posterior. This is the most reliable field mark for males.
Habitat Preference
Search in shaded rocky crevices, under ledges, or in caves in shallow coastal waters. Their cryptic coloration helps them blend in.
Body Shape and Size
Small, elongated body, typically not exceeding 6 cm in total length.
Habitat
- Water type
- saltwater
- Depth
- Typically found from the intertidal zone down to about 40 meters (130 feet), though most commonly observed in shallower waters (1-20 meters).
- Environment
- Rocky reefs, boulder fields, and areas with crevices and overhangs. They prefer shaded or dimly lit environments, often found under ledges or in caves. They are benthic, spending most of their time perched on or near the substrate.
- Geographic range
- Eastern Atlantic Ocean, from the coast of Portugal south to Senegal, including the Canary Islands, Madeira, and the Azores. Also present in the Mediterranean Sea, particularly the western and central basins.
Aquarium Information
- Care level: intermediate
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 30 gallons
- Temperature: 18-24°C (64-75°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Generally compatible with other peaceful, small marine fish and invertebrates. Avoid housing with aggressive species or those large enough to prey on them.
- Special requirements: Requires a well-established marine aquarium with ample live rock for hiding and perching. Good water quality and stable parameters are crucial. Provide shaded areas and crevices. May be shy initially.
Wild Information
- Conservation status: least concern
- Seasonality: Breeding activity is typically observed during spring and summer months, with males displaying intensified coloration and territorial behavior.
- Market price: N/A
- Commercial importance: none
- Taste: N/A
- Texture: N/A
- Nutritional value: N/A
Key Facts
Master of Camouflagebehavior
Outside of breeding season, Black-faced Blennies are incredibly cryptic, blending seamlessly with their rocky surroundings, making them challenging to spot.
Three Dorsal Finsinteresting
The family name 'Tripterygiidae' literally means 'three-finned', referring to their distinctive three separate dorsal fins, a key identification feature.
Shy Dwellersbehavior
These blennies prefer shaded and dimly lit environments, often found hiding under ledges or in small caves, avoiding direct sunlight.
Courtship Displaybehavior
During breeding, male Black-faced Blennies perform elaborate courtship displays, flashing their vibrant black and red coloration and raising their dorsal fins to attract females.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: No specific handling precautions are required beyond general care for small fish. They are not venomous and do not possess sharp spines that pose a significant threat to humans. Handle gently if necessary for observation or transfer.
Similar Species
Red-black Triplefin
Tripterygion tripteronotum
Males of T. tripteronotum have a red head and anterior body, not black, and typically have a more pronounced red coloration over the entire body. The first dorsal fin of T. tripteronotum is often higher and more pointed.
Red-mouthed Blenny
Tripterygion melanurum
T. melanurum males have a dark body with a distinctive red mouth and often a black spot on the caudal fin base. Their overall body coloration is generally darker and less reddish than T. delaisi.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Blenniiformes
- Family
- Tripterygiidae
- Genus
- Tripterygion
- Species
- delaisi
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