Lemon Tetra Identification Guide
Recognize the Lemon Tetra by its yellow-washed fins and black-edged anal fin on a translucent body.
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Key identification features
- Slim, laterally compressed body with a translucent, pale yellow-silver overall tone, reaching 4-5 cm
- Bright lemon-yellow coloring along the leading rays of the dorsal and anal fins, fading toward clear at the fin edges
- A crisp black stripe running along the outer margin of the anal fin, a key diagnostic mark
- Upper portion of the eye tinted a warm red-orange
- Body color intensifies to a richer yellow in healthy, well-conditioned adults, especially males during display
Common look-alikes
- False (X-ray) Tetras: share a similar translucent silver body but lack any yellow fin wash and the black-edged anal fin.
- Bentosi/Serpae group tetras: show reddish rather than yellow tones on the fins, easily separated by overall fin color.
- Hyphessobrycon "loweae": a similar-shaped tetra but with pinkish rather than yellow fin coloring and no black anal fin border.
Where you'll see one
Lemon Tetras are native to slow tributaries, floodplain pools, and blackwater tributaries of the lower Amazon and Tapajós river basins in Brazil, where they school in shaded, vegetated shallows.
Frequently asked questions
How do I distinguish a Lemon Tetra from a False (X-ray) Tetra?
Check fin coloring: the Lemon Tetra shows a clear yellow wash on the dorsal and anal fins with a black anal fin edge, features the plainer False Tetra lacks entirely.
What is the clearest single mark to confirm a Lemon Tetra?
A crisp black line running along the edge of the anal fin, paired with lemon-yellow coloring on the dorsal fin, is the most reliable identifying combination.