Reticulated Hillstream Loach Identification Guide
Identify the Reticulated Hillstream Loach by its flat, disc-like body with a net-like dark pattern.
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Key identification features
- Flattened, disc-like body adapted for clinging to rocks in fast current
- Net-like, dark reticulated markings over a tan to olive background, giving the species its name
- Expanded, wing-like paired pectoral and pelvic fins that spread out to form a suction grip
- Small size, typically around 5-6 cm
- A blunt, rounded head with eyes positioned on top for looking upward while pressed to a rock
- A short tail fin relative to the broad, flat body
Common look-alikes
- Other Sewellia species: share the same flattened, sucker-finned body plan but show spotted or striped patterns rather than a true net-like reticulation.
- Gastromyzon hillstream loaches: have a similar disc shape but display more mottled or blotchy patterning and different fin ray counts.
- Loach goby: also clings to rocks in current but has separate, not fused, pelvic fins and lacks the reticulated pattern.
Where you'll see one
Reticulated hillstream loaches are native to fast, highly oxygenated rocky streams in Vietnam. They spend nearly all their time clamped to submerged stones in strong current, grazing algae from rock surfaces.
Frequently asked questions
How do I recognize a reticulated hillstream loach's pattern?
Look for a fine, net-like web of dark lines over the body rather than spots or stripes, which is the defining pattern for this species.
How does a reticulated hillstream loach differ from a loach goby?
The hillstream loach has fused pelvic fins forming a single sucker disc, while the loach goby's pelvic fins remain separate.