Lambchop Rasbora Care Guide
Trigonostigma espei · Freshwater Fish
What Lambchop Rasbora look like
The Lambchop Rasbora (Trigonostigma espei) exhibits a laterally compressed, fusiform body shape, reaching a maximum adult size of approximately 5 cm (2 inches). This species is characterized by its distinctive coloration, featuring a prominent black horizontal stripe that runs from the snout to the caudal peduncle, contrasting with a vibrant orange-red hue on the dorsal and anal fins. Sexual dimorphism is subtle, with females typically exhibiting a fuller, rounder abdomen when gravid. Defensive adaptations include a streamlined body that allows for quick bursts of speed to evade predators. Notably, the species possesses a well-defined lateral line system, which aids in detecting water movements and vibrations, and its dentition is adapted for an omnivorous diet, featuring small, conical teeth suited for grazing on algae and consuming small invertebrates.
Behavior & temperament
Trigonostigma espei is a social species that thrives in groups, exhibiting a strong tendency to form schools, which enhances its safety from predators. These fish are primarily pelagic, inhabiting the mid to upper levels of the water column in their natural habitats, which consist of slow-moving streams and rivers in Thailand. Breeding behavior involves egg scattering, where females release eggs among vegetation, providing some degree of protection for the developing embryos. The temperament of the Lambchop Rasbora is generally peaceful, making it an excellent community fish, though it may display mild territoriality during breeding periods.
Diet & feeding
In the wild, the Lambchop Rasbora is an omnivore, feeding on a varied diet that includes small invertebrates, algae, and detritus. In captivity, it requires a balanced diet consisting of high-quality flake food, supplemented with live or frozen foods such as daphnia and brine shrimp to ensure optimal health and coloration.
Behind the name
Trigonostigma (triangular mark); espei (named in honor of the German aquarist and fish collector, Dr. Hans Espe)
Plan your tank
Check the numbers before you buy: tank volume, a stocking plan, cycle progress, water changes, and your ongoing care routine.
Keeping Lambchop Rasbora?
AquaLens identifies your fish and plants from a photo, tracks water chemistry, and flags health issues early — free on iOS and Android.
