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The Greater Lizardfish (Synodus indicus) is a demersal marine fish belonging to the family Synodontidae, commonly known as lizardfishes. It is characterized by its elongated, cylindrical body, large mouth, and cryptic coloration, which allows it to blend seamlessly with sandy or muddy substrates. This species is a voracious ambush predator, lying in wait for unsuspecting prey. It is a relatively common species within its range and plays a role in the marine food web.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Dorsal surface typically light brown to grey, often with darker saddles or blotches that aid in camouflage. Ventral surface is whitish. Fins are generally translucent with some darker markings. A series of indistinct dark blotches or bars may be present along the lateral line.
- Scale type
- cycloid
- Mouth position
- superior
- Distinctive features
- Elongated, cylindrical body, tapering towards the tail., Large, broad head with a prominent, wide mouth extending well past the posterior margin of the eye., Numerous sharp, needle-like teeth on both jaws, tongue, and palatine bones., Adipose fin present, small and fleshy, located posterior to the dorsal fin., Large eyes positioned dorsally on the head, providing a wide field of vision for ambush predation., Scales are relatively large and cycloid.
- Dorsal fin
- Single dorsal fin, typically with 10-13 soft rays. Originates slightly anterior to the pelvic fin insertion.
- Tail fin
- Forked caudal fin, moderately sized.
- Pectoral fin
- Relatively small, positioned low on the body, with 11-13 rays.
- Distinctive fins
- Pelvic fins are large, located abdominally, with 8 rays, and are positioned anterior to the dorsal fin origin. The inner rays are typically longer than the outer rays. Adipose fin present.
Identification Tips
Body Shape and Coloration
Look for the elongated, cylindrical body with cryptic brown/grey coloration and potential darker blotches. The large, lizard-like head is distinctive.
Mouth and Teeth
The very large mouth extending beyond the eye, armed with numerous sharp, visible teeth, is a key identifier.
Adipose Fin
The presence of a small, fleshy adipose fin between the dorsal and caudal fins is characteristic of lizardfishes (Synodontidae).
Pelvic Fin Position
Pelvic fins are large and located abdominally, anterior to the dorsal fin origin, with the inner rays typically longer than the outer rays.
Lateral Line Scales
Count the number of scales along the lateral line (typically 55-60 in S. indicus) and compare with similar species.
Habitat
- Water type
- saltwater
- Depth
- Typically found on continental shelves and slopes, ranging from shallow coastal waters (around 10 meters) down to depths of approximately 200 meters, though most commonly observed between 20-100 meters.
- Environment
- Demersal, inhabiting sandy, muddy, or silty bottoms. Often found partially buried in the substrate, with only their eyes and mouth exposed, waiting to ambush prey. Can also be found on rubble or shell-hash bottoms.
- Geographic range
- Indo-Pacific region. Its distribution extends from the Red Sea and East Africa eastward to the Western Pacific, including Japan, Australia, and various island nations. It is particularly common in the Indian Ocean, hence its specific epithet 'indicus'.
Aquarium Information
- Care level: expert
- Temperament: aggressive
- Diet: carnivore
- Minimum tank size: 200 gallons
- Temperature: 24-28°C (75-82°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Not suitable for most community tanks. Best kept in a species-specific tank or with very large, robust, and fast-moving fish that cannot be swallowed. Will consume any fish or invertebrate small enough to fit in its mouth.
- Special requirements: Requires a deep sand bed for burrowing and camouflage. Excellent filtration is essential due to its carnivorous diet. Provide ample open swimming space and secure tank lid as they can jump.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal patterns for availability; caught year-round as bycatch.
- Market price: Low
- Commercial importance: low
- Taste: Mild, somewhat bland
- Texture: Flaky, soft
- Cooking methods: Frying, Grilling, Steaming
- Nutritional value: Good source of protein and omega-3 fatty acids, though not a primary target for consumption due to numerous small bones.
Key Facts
Ambush Predatorbehavior
Greater Lizardfish are classic ambush predators, often burying themselves in sand or mud with only their eyes exposed, waiting for prey to swim by.
Lizard-like Appearanceinteresting
Their common name comes from their elongated body, large head, and wide mouth, which give them a reptilian or 'lizard-like' appearance.
Voracious Eatersbehavior
They have a remarkably large mouth filled with numerous sharp teeth, allowing them to engulf surprisingly large prey items whole.
Adipose Fininteresting
The presence of a small, fleshy adipose fin (a fin without rays) on their back, near the tail, is a characteristic feature of the lizardfish family.
Safety Information
Handle with care- Safety level: caution
- Venomous: No
- Edibility: edible
- Handling notes: While not venomous, Greater Lizardfish possess numerous sharp, needle-like teeth. Care should be taken when handling to avoid bites, which can be painful and cause lacerations. Use gloves or a fish gripper if necessary. They are also very slippery.
Similar Species
Slender Lizardfish
Synodus variegatus
S. variegatus generally has a more slender body, often with more distinct dark blotches or bars on the sides, and typically has fewer lateral line scales (50-54) compared to S. indicus. The mouth of S. variegatus may not extend as far past the eye as in S. indicus.
Clearfin Lizardfish
Synodus dermatogenys
S. dermatogenys often has a more mottled or spotted pattern, and its pectoral fins are typically shorter, not reaching the dorsal fin origin. The number of lateral line scales can also differ (usually 56-60 for S. dermatogenys, similar to S. indicus, requiring careful examination of other features).
Reef Lizardfish
Synodus intermedius
S. intermedius is primarily an Atlantic species, but if considering range overlap in some areas, it typically has a more pronounced series of dark blotches along the lateral line and a slightly different head shape. Fin ray counts and scale counts would be necessary for definitive identification.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Aulopiformes
- Family
- Synodontidae
- Genus
- Synodus
- Species
- indicus
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