### **The Sunken-snout Stream Catfish (*Akysis recavus*)**
Identification
Measuring a diminutive 35–40mm, *Akysis recavus* is a master of miniature camouflage. Its body is a striking tapestry of deep chocolate-brown bands set against a creamy, honey-yellow base. To distinguish it from its cousins, look closely at its profile: the species name *recavus* refers to its uniquely "recessed" or concave snout, giving it a slightly upturned, pug-nosed appearance compared to the flatter heads of other *Akysis* species. Its skin is not smooth but covered in longitudinal rows of tiny, bead-like tubercles, providing a gritty, sandpaper texture that breaks up its silhouette against the riverbed.
Habitat & Range
This specialist is endemic to the Chao Phraya river basin in Thailand. It thrives in clear, well-oxygenated forest streams, specifically in shallow riffles where the water tumbles over a mix of sand and smooth stones. You won’t find them in stagnant pools; they require the constant flow of highland currents to survive.
Behaviour
By day, *A. recavus* is a ghost. It hunkers down in the "interstitial spaces" between rocks or buries itself in leaf litter to avoid predators. Unlike sleek, mid-water swimmers, this catfish is a "crawler." It uses its stiff, serrated pectoral spines as anchors to navigate the current. They are solitary, nocturnal creatures that rely on four pairs of sensitive, tactile barbels to "taste" their environment in the pitch black.
Diet
As a benthic micro-predator, its diet consists almost entirely of aquatic insect larvae and tiny crustaceans. It is a patient, opportunistic hunter, vacuuming up prey that drifts into its path or flushing out small worms from the sandy substrate using its sensitive snout.
Fascinating Fact
In a bizarre display of hygiene, *Akysis recavus* periodically sheds its entire outer layer of skin! This "sloughing" process, more common in reptiles than fish, is thought to prevent the growth of algae and parasites on their textured, tuberculated skin.