### Identification The **Spotted Stream Catfish (*Akysis maculipinnis*)** is a diminutive marvel, rarely exceeding 3.5 cm (1.4 inches) in length. Its body is a mottled tapestry of burnt orange and deep chocolate brown, providing perfect camouflage against riverbed detritus. Look closely at the fins—the specific epithet *maculipinnis* refers to the distinct dark spotting on the dorsal and pectoral fins, a key field mark that distinguishes it from the closely related *A. vespa*. Its skin is not smooth but covered in tiny, sandpaper-like bumps called unculiferous tubercles. Keep an eye out for its four pairs of prominent barbels and a relatively short adipose fin, which helps separate it from other Asian stream catfishes.
### Habitat & Range This species is a specialist of the Chanthaburi River system in southeastern Thailand. You won't find them in open, stagnant water; they are strictly residents of shallow, fast-flowing forest streams. They favor micro-habitats with high dissolved oxygen and a substrate composed of coarse sand, smooth gravel, and significant accumulations of submerged leaf litter, where they can remain undetected.
### Behaviour An observer in the field would need a powerful flashlight and a lot of patience, as *A. maculipinnis* is strictly nocturnal. During the day, they are "sit-and-wait" hiders, wedging themselves into crevices or burying into leaf piles. They are solitary and highly tactile, using their sensitive barbels to navigate the dark, rushing water. When breeding, they are egg-scatterers, though their secretive nature means their spawning rituals are rarely witnessed in the wild.
### Diet As benthic micro-predators, these catfish are the "shrews" of the stream bed. They forage along the bottom, using their barbels to detect movement. Their diet consists almost exclusively of tiny aquatic invertebrates, such as midge larvae, small crustaceans, and water mites.
### Fascinating Fact Unlike most fish, members of the *Akysis* genus—including *maculipinnis*—periodically shed their entire skin! This process, known as ecdysis, is common in reptiles but rare in fish; they cast off a transparent layer of old skin to prevent the buildup of algae and parasites on their textured bodies.