The Green-eyed Rasbora (Rasbora kalochroma) is a small, freshwater fish known for its shimmering body and striking green eyes, which give it its name. This species is a member of the Cyprinidae family, which is renowned for its diverse and colorful varieties of freshwater fish. The Green-eyed Rasbora typically grows to a length of 4-6 centimeters, making it a relatively small but visually captivating addition to tropical freshwater habitats. Its body is slender and elongated, sporting a lustrous silvery hue accentuated by a greenish tinge, while its eyes gleam with an enchanting emerald color. These features make the Green-eyed Rasbora a favorite among aquarium enthusiasts and researchers alike.
This eye-catching fish is native to the waters of Southeast Asia, with a significant population found in the rivers and streams of Borneo. The Green-eyed Rasbora thrives in freshwater environments that offer clean, slow-moving waters with abundant vegetation. Borneo's tropical rainforests provide the perfect backdrop for these habitats, with their rich biodiversity and dense foliage. The fish is commonly found in forested stream habitats, where the water is soft and slightly acidic, conditions that are well-suited to their needs. The lush greenery provides ample hiding spots and breeding grounds, allowing the Green-eyed Rasbora to flourish in relative safety from both natural predators and human activities.
The Green-eyed Rasbora faces several natural threats in its native habitat. Predatory fish species, such as larger cyprinids and catfish, pose a significant risk, especially to juvenile Rasboras. Birds that prey on fish, like kingfishers and herons, also target these small fish, swooping down to catch them in their beaks. Reptiles, such as water snakes, add to the list of natural predators, using the cover of dense aquatic vegetation to ambush these unsuspecting fish. Despite these threats, the Green-eyed Rasbora employs its agility and the safety of underwater plants to evade capture, although predation remains a constant challenge in their natural ecosystem.
The Green-eyed Rasbora is an omnivorous species, feeding on a diverse diet that supports its vibrant health and coloration. Their primary diet consists of insects and their larvae, small crustaceans, zooplankton, and plant matter. In the wild, they forage for food among the submerged vegetation and detritus on the stream bed, using their keen vision to hunt for tiny prey. This diverse diet not only sustains their nutritional needs but also aids in maintaining water quality by controlling insect populations and breaking down organic matter. In aquariums, they can be fed a varied diet of high-quality flake food, live or frozen daphnia, bloodworms, and brine shrimp to mimic their natural feeding habits and keep them healthy.