Striped Panchax

The striped panchax (Aplocheilus lineatus) is a medium-sized killifish native to freshwater habitats across India and Sri Lanka. It belongs to the family Aplocheilidae within the order Cyprinodontiformes and is one of the largest members of its genus, commonly known in the aquarium trade as the golden wonder killifish. It inhabits ponds, ditches, rice paddies, and slow-flowing streams, where its upturned mouth and surface-oriented body allow it to hunt effectively near the water's top. As an adaptable, hardy species, it has also become established outside its native range in some areas where it has been introduced.

Striped panchax are relatively large killifish, with males reaching 8-10 cm.

• Body: elongated and torpedo-shaped, with a flattened head and large, upturned mouth
• Coloration: golden-olive base with several dark horizontal stripes running along the length of the body
• Fins: fins often show red-orange speckling, more pronounced in males, with a rounded caudal fin
• Sexes: males are typically larger and more vividly colored than females

The multiple bold horizontal stripes and larger overall size distinguish it from the smaller, more subtly patterned blue panchax (Aplocheilus panchax).

Striped panchax are native to still and slow-moving freshwater habitats across India and Sri Lanka, including ponds, ditches, swamps, rice paddies, and the calmer margins of streams. They favor warm, vegetated water with a good supply of surface insects, staying close to the top of the water column. The species tolerates a range of water conditions and occasionally brackish influence near coastal wetlands, contributing to its success as an adaptable, wide-ranging species within South Asia. It is generally absent from cold, fast-flowing, or heavily shaded forest streams, preferring open, sunlit water bodies instead.

Striped panchax are active, predatory surface feeders, using their large upturned mouth to ambush insects, insect larvae, and even smaller fish near the water's surface. They are more aggressive and predatory than many smaller killifish, particularly as adults, and can be territorial toward similarly sized fish. Spawning occurs among fine-leaved vegetation, where eggs are scattered and adhere until hatching roughly two weeks later, with no parental care given. Due to its appetite for mosquito larvae, the species is sometimes valued for natural insect control in ponds and wetlands within its native and introduced range.