Silver loach

Silver loach (Yasuhikotakia lecontei) is a sleek, medium botiid from Southeast Asia. It reaches about 15 cm SL (5.9 inches), lives 6-12 years, and shows a silver body often with yellow- to red-tipped fins and a dark blotch at the tail base. It is social and can be semi-aggressive, especially lively at dusk as it digs through sand and wedges into rock crevices. It is often confused with the blue botia, Y. modesta.

Origin and natural habitat

Native to the Mekong and Chao Phraya river systems of Southeast Asia, this species is adapted to flowing freshwater. In the wild it works sandy or fine substrates, tucks into rocky cracks and wood for shelter, and becomes particularly active toward dusk.

Aquarium setup and water conditions

A 45-gallon or larger aquarium is the minimum for a small group. Use a soft sand substrate so they can dig without injury, and stack smooth rocks, caves, and driftwood to create tight crevices. Provide open swimming space plus shaded retreats. Because this fish comes from rivers, steady, clean water with good circulation and oxygenation suits it well. Keep a secure lid, as boisterous dusk activity can lead to sudden dashes.

• Temperature: 24-28 C
• pH: 6.0-7.5
• Hardness: 1-15 dGH
• Water type: freshwater
• Minimum tank size: 45 US gallons

Diet and feeding

An omnivore that accepts quality sinking pellets as a staple. Supplement with frozen or live invertebrates and expect it to take snails. Feeding shortly after lights dim suits its crepuscular habits and encourages natural foraging.

• Staple: sinking pellets for carnivorous/omnivorous bottom fish
• Regular extras: frozen or live invertebrates
• Occasional: crushed pest snails (it will hunt snails on its own)

Behaviour and tankmates

Social but semi-aggressive, this species does best kept with its own kind in a small group. Expect boisterous chasing and short bouts of sparring as they sort out a hierarchy, especially around dusk. They dig constantly and wedge into tight spots, so furnish multiple hideouts to spread attention and reduce squabbles.

• Good companions: similarly sized, robust, fast-swimming fishes that can handle active tankmates
• Use caution with: very small, delicate, or slow long-finned species
• Incompatible: ornamental snails and most dwarf shrimp

Common problems and how to avoid them

• Mistaken identity: Silver loach is often sold as or confused with Yasuhikotakia modesta. Confirm identification before mixing with existing stocks or planning a community.
• Barbel damage: Avoid sharp gravel; keep substrate clean to prevent infections around the mouth from constant digging.
• Under-housing: Keeping a single fish or in cramped quarters can increase pushy behavior. Provide space and several of their own kind.
• Snail losses: They will reduce or wipe out snail populations. Plan accordingly if you keep ornamental snails.