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Ophidion barbatum, commonly known as the Cusk-eel, is a demersal marine fish belonging to the family Ophidiidae. It is characterized by its elongated, eel-like body and nocturnal habits. This species is often found burrowing in soft substrates during the day and emerging at night to feed.
Physical Characteristics
- Body shape
- eel-like
- Coloration
- Typically pale brown to yellowish-brown on the dorsal side, fading to a lighter, often whitish, ventral side. May have faint darker blotches or spots along the flanks. Fins are generally translucent or matching the body color.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Elongated, compressed body tapering to a pointed tail., Large mouth with small, sharp teeth., Presence of a barbel-like appendage on the chin (though this can be subtle in some individuals or species within the genus)., Absence of pelvic fins or reduced to a pair of bifid filaments under the throat.
- Dorsal fin
- Long, continuous dorsal fin originating behind the head and confluent with the caudal and anal fins.
- Tail fin
- Pointed, confluent with dorsal and anal fins, forming a continuous median fin.
- Pectoral fin
- Small, fan-like pectoral fins located just behind the operculum.
- Distinctive fins
- Pelvic fins are absent or reduced to two slender, bifid filaments located beneath the throat, often difficult to observe.
Identification Tips
Body Shape
Look for the distinctly elongated, snake-like body that tapers to a pointed tail.
Fins
Note the continuous dorsal, caudal, and anal fins. The absence or reduction of pelvic fins to two thread-like structures is a key identifier for the family Ophidiidae.
Coloration
Observe the generally uniform pale brown to yellowish-brown coloration, often with a lighter belly.
Mouth
The relatively large mouth with small, sharp teeth is characteristic.
Habitat
- Water type
- saltwater
- Depth
- Typically found in depths ranging from 10 to 200 meters, though can occur shallower or deeper.
- Environment
- Demersal, inhabiting soft bottoms such as sand, mud, or gravel. Often burrows into the substrate during the day.
- Geographic range
- Eastern Atlantic Ocean, from the Bay of Biscay south to Angola, including the Mediterranean Sea and the Black Sea. Also reported from the Canary Islands and Madeira.
Aquarium Information
- Care level: advanced
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 100 gallons
- Temperature: 18-24°C (64-75°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Generally compatible with other peaceful, non-aggressive fish that are not small enough to be considered prey. Avoid housing with aggressive or highly territorial species.
- Special requirements: Requires a deep sand bed (at least 10-15 cm) for burrowing. Dim lighting and plenty of hiding spots are essential. Live or frozen meaty foods are preferred. Not commonly kept in home aquaria due to specialized needs and cryptic nature.
Wild Information
- Conservation status: least concern
- Seasonality: No specific commercial seasonality; generally available year-round in its habitat.
- Market price: N/A
- Commercial importance: low
- Taste: Mild, slightly sweet
- Texture: Firm, flaky
- Cooking methods: Baked, Fried, Grilled, Steamed
- Nutritional value: Good source of protein and omega-3 fatty acids.
Key Facts
Nocturnal Hunterbehavior
Ophidion barbatum is primarily nocturnal, emerging from its burrow at night to forage for small invertebrates and fish.
Burrowing Behaviorbehavior
This species is well-adapted for burrowing, using its pointed tail and elongated body to dig into soft sediments, where it spends daylight hours hidden.
Sound Productioninteresting
Some cusk-eels, including species within the Ophidiidae family, are known to produce sounds, particularly during courtship or territorial displays, using specialized sonic muscles.
Reduced Pelvic Finsamazing
A distinctive feature of the Ophidiidae family is the reduction or complete absence of pelvic fins, often replaced by two slender, thread-like filaments located under the throat.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions are required beyond standard fish handling practices to avoid injury from sharp fins or teeth. They are not venomous.
Similar Species
Fierasfer
Carapus acus
Fierasfer species are typically commensal with invertebrates (e.g., sea cucumbers), have a more slender body, and often lack scales. Ophidion barbatum is free-living and scaled.
Other Ophidion species
Ophidion rochei, Ophidion vassali
Distinguishing between different Ophidion species often requires careful examination of fin ray counts, vertebral counts, and specific morphological ratios, which can be challenging without specialized knowledge. O. barbatum typically has a higher number of dorsal and anal fin rays compared to some congeners.
Conger Eel
Conger conger
Conger eels have distinct pectoral fins, a more robust body, and separate dorsal, caudal, and anal fins (not confluent). They also lack the reduced or absent pelvic fins characteristic of cusk-eels.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Ophidiiformes
- Family
- Ophidiidae
- Genus
- Ophidion
- Species
- Ophidion barbatum
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