The Jade-eye Cichlid, scientifically known as Cryptoheros spilurus, is a colorful and engaging species of cichlid native to the rivers and streams of Central America, particularly in Honduras and Guatemala. This fish is also commonly referred to as the Blue-eye Cichlid, thanks to the striking blue ring around its eye, which gives it a distinctive and attractive appearance.

Cryptoheros spilurus is a moderately sized cichlid that exhibits a vibrant color palette. The body color can vary from greens to blues with significant iridescent qualities, especially when the fish are healthy and well-cared-for. The males typically display more intense colors and may show more extended fins than the females. During breeding, both males and females often exhibit even richer coloration and more pronounced territorial behaviors.

In captivity, Jade-eye Cichlids thrive in a well-structured aquarium that provides both space for swimming and numerous hiding spots. The tank should be decorated with rocks, caves, and driftwood to create natural boundaries and shelters, which are essential for reducing stress and aggression, especially during breeding. Planting the tank with hardy plants can also provide additional cover and enhance the environment's aesthetics, though these fish may dig and rearrange the substrate and decor.

The water quality must be kept high, with regular maintenance to ensure stability in parameters. These cichlids prefer clean, well-oxygenated water with a neutral to slightly alkaline pH. They are adaptable to various water conditions but thrive best when their environment closely mimics their natural habitat.

The diet of Cryptoheros spilurus should be varied and nutritious to maintain their health and coloration. It should include a mix of high-quality cichlid pellets or flakes, supplemented with live or frozen foods such as brine shrimp, bloodworms, and daphnia. Vegetable matter or algae-based foods should also be incorporated regularly to provide a balanced diet.

Breeding Jade-eye Cichlids can be a rewarding experience as they are substrate spawners, typically laying their eggs on flattened rocks or directly in caves. They exhibit parental care, with both parents actively participating in guarding the eggs and fry. The breeding process can be encouraged by providing optimal water conditions and a diet rich in nutrients.

Overall, Cryptoheros spilurus is an excellent choice for aquarists looking to keep a relatively peaceful cichlid species that offers both beauty and interesting behaviors. They are suitable for a community tank with other similarly sized and tempered fish, making them a versatile addition to many freshwater aquarium setups.