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Channa marulius, commonly known as the Snakehead Murrel, is a large, predatory freshwater fish native to South and Southeast Asia. It is characterized by its elongated, cylindrical body, large mouth, and a distinctive ocellus (eye-spot) at the caudal fin base in juveniles and sub-adults, which may fade or become less prominent in mature adults. This species is highly adaptable, capable of surviving in low-oxygen environments due to its accessory respiratory organ, allowing it to breathe atmospheric air. It is a significant food fish in its native range and a popular, albeit challenging, species for large aquariums.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Adults typically exhibit a dark brown to grayish-green dorsal coloration, fading to a lighter belly. The flanks are often marked with irregular dark blotches or vertical bands. A prominent, often golden or orange, lateral stripe may be present, especially in younger individuals. Juveniles have a distinct black ocellus (eye-spot) ringed with orange or yellow at the base of the caudal fin, which can persist into adulthood or become less defined.
- Scale type
- cycloid
- Mouth position
- superior
- Distinctive features
- Elongated, cylindrical body, Large, snake-like head with large scales on top, Large mouth extending beyond the eye, Long dorsal and anal fins without spines, Accessory respiratory organ (suprabranchial organ) allowing air breathing, Distinctive ocellus (eye-spot) at the caudal fin base in juveniles and sub-adults
- Dorsal fin
- Long, extending from behind the head almost to the caudal fin, with 45-55 soft rays. No spines.
- Tail fin
- Rounded to slightly emarginate.
- Pectoral fin
- Relatively small and rounded.
- Distinctive fins
- Pelvic fins are present and well-developed. Anal fin is also long, similar to the dorsal fin, with 28-36 soft rays and no spines.
Identification Tips
Body Shape and Head
Look for the elongated, snake-like body and a flattened, broad head with large scales, reminiscent of a snake's head. The mouth is large and extends well past the eye.
Coloration and Markings
Observe the dark brown to grayish-green back and flanks with irregular dark blotches or vertical bands. Juveniles and sub-adults will have a prominent black ocellus (eye-spot) ringed with orange or yellow at the base of the caudal fin.
Fin Structure
Note the very long dorsal and anal fins, both lacking spines. The caudal fin is rounded. Pectoral fins are relatively small.
Air Breathing
If observed in the wild, its habit of surfacing to gulp air is a strong indicator of a snakehead species. This is due to its accessory respiratory organ.
Habitat
- Water type
- freshwater
- Depth
- Typically found in shallow to moderately deep waters, often near vegetation or submerged structures.
- Environment
- Inhabits a wide range of freshwater environments including rivers, streams, canals, lakes, ponds, reservoirs, and swamps. Prefers slow-moving or stagnant waters with dense aquatic vegetation, muddy bottoms, and submerged roots or debris for cover. Can tolerate low oxygen conditions and even survive short periods out of water by burrowing into mud.
- Geographic range
- Native to South and Southeast Asia, including India, Sri Lanka, Bangladesh, Pakistan, Nepal, Myanmar, Thailand, Cambodia, Laos, Vietnam, Malaysia, and Indonesia. Introduced populations exist in other parts of the world, including the United States, where it is considered an invasive species.
Aquarium Information
- Care level: advanced
- Temperament: aggressive
- Diet: carnivore
- Minimum tank size: 250 gallons (946 liters) for a single adult
- Temperature: 75-82°F (24-28°C)
- pH level: 6.0-7.5
- Hardness: 5-20 dGH
- Compatibility: Best kept as a solitary specimen. Can be housed with other large, robust, and equally aggressive fish in extremely large aquariums, but this is generally not recommended due to its predatory nature.
- Special requirements: Requires a tightly fitting lid as they are excellent jumpers. Ample hiding spots (caves, driftwood) and a substrate of sand or fine gravel are beneficial. Excellent filtration is crucial due to their large size and carnivorous diet. Regular large water changes are necessary.
Wild Information
- Conservation status: least concern
- Seasonality: Breeds primarily during the monsoon season (rainy season) in its native range, typically from June to September, when water levels are high.
- Market price: Varies significantly by region and size, often high in local markets due to demand for food fish.
- Commercial importance: high
- Taste: Mild, firm, white flesh
- Texture: Flaky, but firm and meaty
- Cooking methods: Frying, Grilling, Steaming, Curries, Soups
- Nutritional value: Good source of protein, low in fat. Often considered a healthy food fish.
Key Facts
Air Breatherbehavior
Channa marulius possesses a suprabranchial organ, an accessory respiratory organ, allowing it to breathe atmospheric air. This adaptation enables it to survive in oxygen-depleted waters and even out of water for short periods.
Parental Carebehavior
Unlike many fish, Snakehead Murrels exhibit strong parental care. Both parents guard the eggs and fry aggressively, protecting them from predators.
Invasive Potentialinteresting
Due to its predatory nature, adaptability, and ability to survive out of water, Channa marulius has become an invasive species in several regions outside its native range, posing a threat to local aquatic ecosystems.
Longevityinteresting
In optimal conditions, Snakehead Murrels can live for over 10 years, making them a long-term commitment for aquarists.
Safety Information
Handle with care- Safety level: caution
- Venomous: No
- Edibility: edible
- Handling notes: Snakehead Murrels possess sharp teeth and can deliver a painful bite if handled carelessly. They are also very strong and slippery. Use thick gloves and a net or appropriate tools for handling. Exercise extreme caution to avoid bites. They can survive out of water for extended periods, so ensure secure containment.
Similar Species
Giant Snakehead
Channa micropeltes
C. micropeltes typically has a more robust body, a more pointed snout, and a distinct black lateral stripe that may break into blotches in adults. Juveniles have prominent orange and black lateral stripes. It generally grows larger than C. marulius and lacks the distinct caudal ocellus in adults.
Blotched Snakehead
Channa maculata
C. maculata is generally smaller and has more distinct, irregular dark blotches or spots over its body, often forming a somewhat reticulated pattern. It also lacks the prominent caudal ocellus of C. marulius.
Striped Snakehead
Channa striata
C. striata is characterized by several dark, oblique stripes or bands on its flanks, which are generally more regular than the markings on C. marulius. It also lacks the caudal ocellus and typically has a more compressed body shape.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Anabantiformes
- Family
- Channidae
- Genus
- Channa
- Species
- Channa marulius
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