Ceylon Killifish Identification Guide
Identify the Ceylon killifish by its greenish-gold body dotted with red-orange spots and its rear-set dorsal fin.
Read the full Ceylon Killifish encyclopedia entry →Key identification features
- Elongated, cylindrical body with a flattened, upturned mouth for surface feeding
- Greenish-olive to golden base color, sometimes with a faint bluish sheen
- Rows of red-orange spots along the sides, more vivid and numerous in males
- Dorsal fin set far back near the tail
- Large eyes positioned high on the head
- Maximum size around 3 inches, with females noticeably plainer than males
Common look-alikes
- Golden wonder killifish: a solid gold color morph lacking the Ceylon killifish's red spotting pattern
- Wild-type striped panchax: shows bold dark longitudinal stripes rather than rows of red spots
- Bluefin killifish: much smaller and shows blue-tipped fins rather than red body spotting
Where you'll see one
The Ceylon killifish is endemic to Sri Lanka, where it inhabits shallow, still, or slow-moving vegetated waters, including rice paddies, ponds, and forest streams. It sits near the surface, using its upturned mouth to snap up insects and other small prey from the water's surface film, often lingering under overhanging vegetation for cover between feeding bouts.
Frequently asked questions
How do I tell a Ceylon killifish from a golden wonder killifish?
The Ceylon killifish shows rows of red-orange spots over a greenish-gold body, while the golden wonder is a nearly solid golden-orange color morph lacking that spotted pattern.
What body feature confirms a fish is a Ceylon killifish rather than a generic topminnow?
The flattened, upturned mouth combined with a dorsal fin set far back near the tail and large, high-set eyes are characteristic of the Ceylon killifish and its panchax relatives.