The Blue Triangle Fish, scientifically known as *Rasbora heteromorpha* (also called the Harlequin Rasbora), is a popular tropical fish known for its striking appearance. It is also referred to by various names such as the Profiled Fish, Triangle Fish, Pennant, Red Triangle, Black Triangle, and Las Plata. Its common English names include Harlequin Fish and Red Rasbora. This small but vibrant species belongs to the carp family and is native to Southeast Asia, particularly Malaysia, Singapore, Thailand, and Indonesia.
What makes this fish so distinctive is its beautiful blue triangular markings on the sides of its body, paired with light pink or olive-green hues across its scales. The males typically have larger, more intense blue triangles than females, giving the fish its nickname "Blue Triangle Fish." With its elegant appearance and lively behavior, it's often called the "Queen of Tropical Fish" and is a favorite among aquarium enthusiasts.
In terms of size, the Blue Triangle Fish grows to about 3–5 cm in length. Its body is slightly wider than it is long, with a slightly upturned mouth and large, red-rimmed eyes. The fish has thin, transparent scales, and its fins are mostly pale red with white edges. The dorsal, anal, and caudal fins are light red, while the pectoral and pelvic fins are colorless and see-through. Some individuals may show hints of rose red or blue in their fins, which complement their overall coloration.
There are two main types: the large and small Blue Triangle Fish. The larger variety is more ornamental, with darker and more defined blue markings, while the smaller one has less distinct patterns. These fish thrive in soft, slightly acidic water conditions, with a temperature range of 24–28°C. They prefer tanks with plenty of plants and clean, well-filtered water. During breeding, it’s important to maintain stable conditions and avoid sudden temperature changes, as they are prone to diseases like white spot disease.
They are peaceful and social fish that can coexist with other non-aggressive species but should not be kept with large or aggressive fish. Providing ample hiding spots and live plants enhances their comfort and visual appeal. When it comes to feeding, they are not picky eaters and can be fed live food, flakes, or frozen foods. However, overfeeding should be avoided to prevent water pollution.
Identifying male and female Blue Triangle Fish becomes easier during breeding season. Males tend to have brighter colors, slimmer bodies, and larger blue triangles, while females are rounder, with a swollen belly and lighter coloration. Breeding them requires careful preparation, including a properly sized tank, suitable plants, and optimal water parameters. Once spawning begins, the eggs are laid on plant leaves and must be protected from being eaten by the parents.
After hatching, the fry are initially fed with microscopic zooplankton before gradually transitioning to larger food sources. With proper care, these fish can be successfully bred in home aquariums, making them a rewarding addition to any collection.
Homemade Noodle Dryer,Noodle Drying Machine,Noodle Dryer Machine
Henan chinamian foods CO.LTD , https://www.ooossooo.com