Puudiagrammis

Puudiagrammis is a genus of small, freshwater fish belonging to the family Cobitidae, commonly known as loaches. The name "Puudiagrammis" is derived from the Latinized combination of "puu," meaning "tree" in Finnish, and "grammistes," referencing the genus *Grammites*, a related group of loaches. This genus is primarily found in the freshwater ecosystems of East Asia, particularly in the Amur River basin, which spans parts of Russia, China, and North Korea.

Puudiagrammis species are characterized by their slender, elongated bodies, typically reaching lengths of 5 to 10 centimeters (2 to 4 inches). They possess a distinctive dorsal fin positioned relatively far back on their bodies and a series of barbels around their mouths, which they use to forage for food in the substrate. Their coloration is often muted, featuring shades of brown, gray, or olive, allowing them to blend seamlessly into their natural environments.

The most well-known species within this genus is *Puudiagrammis gracilis*, commonly referred to as the slender loach or Amur loach. This species is particularly valued in the aquarium trade due to its hardy nature and active behavior. Puudiagrammis species are omnivorous, feeding on a diet that includes small invertebrates, algae, and detritus. They are often found in slow-moving or still waters, such as rivers, streams, and lakes, where they inhabit sandy or gravelly substrates.

In the aquarium hobby, Puudiagrammis species are appreciated for their ability to control algae and their role in maintaining clean tank environments. They are generally peaceful and can be kept in community tanks with other non-aggressive fish species. Breeding Puudiagrammis in captivity is challenging and not widely documented, as they typically reproduce in the wild during specific seasonal conditions. Conservation efforts are not widely focused on this genus, as they are not currently considered threatened or endangered.