How to Identify Three-lined Corydoras

To identify Three-lined Corydoras (Corydoras trilineatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is typically light tan to silvery-grey, adorned with a distinctive pattern of dark markings. A prominent dark stripe runs horizontally along the lateral line, often broken or reticulated. Above and below this, there are often additional, less defined dark lines or rows of spots, giving rise to the 'three-lined' common name. The head is often covered in a reticulated or vermiculated pattern of dark lines. Fins are generally translucent with some dark spotting, particularly on the dorsal and caudal fins. The belly is whitish.

Scale type

none

Mouth position

inferior

Distinctive features

Reticulated or net-like pattern on the head and upper body, distinguishing it from C. julii., Three primary dark lines or rows of spots along the body, though these can be variable., Two pairs of sensitive barbels around the mouth for foraging.

Dorsal fin

Single dorsal fin, typically with one spine and 7-8 soft rays. The spine can be serrated.

Tail fin

Forked caudal fin, often with dark spots or bands.

Pectoral fin

Pectoral fins are well-developed, with a strong spine that can be locked into position for defense.

Distinctive fins

Adipose fin present, typical of Callichthyidae.

Identification Tips

1. 1

   Head Pattern

   Look for a distinct reticulated or vermiculated (worm-like) pattern of dark lines on the head, rather than discrete spots. This is the most reliable way to differentiate it from Corydoras julii.

2. 2

   Lateral Line Stripe

   Observe the main dark stripe along the lateral line. In C. trilineatus, this stripe is often somewhat broken, irregular, or composed of fused spots, and may be bordered by smaller spots or lines above and below.

3. 3

   Body Markings

   The body pattern is generally more 'net-like' or 'scribbled' compared to the more defined, often larger, spots of C. julii.

4. 4

   Size

   Adults typically reach a maximum standard length of about 5-6 cm (2-2.4 inches).

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