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Macrognathus pancalus, commonly known as the Spiny Eel or Barred Spiny Eel, is a freshwater fish belonging to the family Mastacembelidae. It is characterized by its elongated, eel-like body and a distinctive proboscis-like snout. This species is popular in the aquarium trade due to its unique appearance and generally peaceful nature, though it is primarily nocturnal and often burrows into the substrate.
Physical Characteristics
- Body shape
- eel-like
- Coloration
- The body is typically light brown to olive-green, often adorned with irregular dark brown to black blotches or bars along the flanks. A series of ocelli (eye-spots) or dark spots may be present along the dorsal fin base. The ventral side is usually lighter.
- Scale type
- cycloid
- Mouth position
- inferior
- Distinctive features
- Elongated, snake-like body, Pointed, proboscis-like snout with a small mouth, Separate dorsal fin spines preceding the soft-rayed dorsal fin, Small, embedded scales
- Dorsal fin
- Consists of 20-26 isolated, sharp spines followed by a soft-rayed portion with 44-54 rays. The spiny and soft-rayed portions are continuous or nearly so.
- Tail fin
- Rounded to slightly emarginate, confluent with the dorsal and anal fins in some individuals, but typically distinct.
- Pectoral fin
- Small and rounded, typically with 20-25 rays.
- Distinctive fins
- The anal fin is long, with 3 spines and 44-54 soft rays, similar in length and structure to the soft-rayed dorsal fin. Pelvic fins are absent.
Identification Tips
Body Shape
Look for the distinctly elongated, eel-like body, which is laterally compressed.
Snout
Observe the pointed, fleshy, proboscis-like snout, which is characteristic of the genus Macrognathus.
Dorsal Fin Spines
Count the series of isolated, sharp spines along the anterior part of the dorsal fin, a key feature distinguishing spiny eels from true eels.
Coloration and Pattern
Note the irregular dark blotches or bars on a lighter background, and the presence of ocelli along the dorsal fin base, which can vary among individuals.
Habitat
- Water type
- freshwater
- Depth
- Typically found in shallow to moderately deep waters, often near the bottom.
- Environment
- Inhabits slow-moving to stagnant waters of rivers, streams, canals, ponds, and floodplains. Prefers areas with soft, muddy or sandy substrates and abundant aquatic vegetation or submerged roots for cover and burrowing.
- Geographic range
- Native to South Asia, primarily found in the Ganges-Brahmaputra basin in India, Bangladesh, and Nepal. Also reported from parts of Pakistan and Myanmar.
Aquarium Information
- Care level: intermediate
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 75 gallons (280 liters)
- Temperature: 22-28 °C (72-82 °F)
- pH level: 6.5-7.5
- Hardness: 5-15 dGH
- Compatibility: Generally compatible with other peaceful to semi-aggressive fish that are too large to be considered prey. Avoid very small fish or highly aggressive tankmates. Best kept with other bottom-dwelling species that do not compete for burrowing space.
- Special requirements: Requires a soft, sandy substrate (at least 3-4 inches deep) for burrowing, which is essential for its well-being. Provide plenty of hiding spots using driftwood, rocks, and dense vegetation. Dim lighting is preferred, and a secure lid is necessary as they can be escape artists.
Wild Information
- Conservation status: least concern
- Seasonality: Breeding typically occurs during the monsoon season in its native range, when water levels rise and food is abundant.
- Market price: Low to medium (primarily for aquarium trade)
- Commercial importance: low
- Taste: Mild, somewhat earthy
- Texture: Firm, flaky
- Cooking methods: Frying, Curry, Grilling
- Nutritional value: Good source of protein and omega-3 fatty acids, typical of freshwater fish.
Key Facts
Nocturnal Hunterbehavior
Macrognathus pancalus is primarily nocturnal, emerging from its burrow at night to hunt for small invertebrates and insect larvae.
Burrowing Behaviorbehavior
This species is an expert burrower, using its pointed snout to dig into soft substrates, often burying itself completely during the day.
Air Breathinginteresting
Like many spiny eels, M. pancalus can tolerate low oxygen conditions by gulping atmospheric air, though it is not an obligate air-breather.
Proboscis Snoutamazing
Its distinctive proboscis-like snout is highly sensitive and used to detect prey hidden in the substrate.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: While not venomous, the dorsal fin spines are sharp and can cause a painful prick if handled carelessly. They are also very slippery and can be difficult to hold. Use a net or plastic bag for transfer, and avoid direct skin contact with the spines.
Similar Species
Tire Track Eel
Mastacembelus armatus
M. armatus typically has a more pronounced 'tire track' pattern of interconnected dark markings, a longer snout, and generally grows much larger (up to 90 cm). M. pancalus is smaller and has more irregular blotches or bars.
Peacock Eel
Macrognathus siamensis
M. siamensis is generally smaller and has a distinct pattern of ocelli (eye-spots) along the dorsal fin, often with a more vibrant coloration. M. pancalus may have ocelli but they are usually less prominent and the overall pattern is more blotchy/barred.
Half-banded Spiny Eel
Macrognathus aral
M. aral typically has a series of distinct, often incomplete, vertical bands or blotches on its body and may lack the prominent ocelli seen in M. pancalus. Its snout can also be less elongated.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Synbranchiformes
- Family
- Mastacembelidae
- Genus
- Macrognathus
- Species
- Macrognathus pancalus
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