How to Identify Black Swordtail Characin

To identify Black Swordtail Characin (Hasemania melanura), look at these key features.

Physical Characteristics

Body shape

torpedo

Coloration

The body is generally a coppery-gold to silvery-brown, often with iridescent scales. A prominent black stripe runs horizontally along the caudal peduncle and extends into the lower lobe of the caudal fin. Males tend to be more intensely colored, especially during breeding, exhibiting brighter copper tones. Fins are typically translucent, sometimes with a reddish tint.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Absence of an adipose fin, which is unusual for characins., Distinctive black stripe on the caudal peduncle and lower caudal fin lobe., Males are generally more slender and intensely colored than females.

Dorsal fin

Single, relatively small, located mid-body.

Tail fin

Forked, with the lower lobe often exhibiting the characteristic black stripe.

Pectoral fin

Small, clear, positioned ventrally.

Distinctive fins

Absence of an adipose fin.

Identification Tips

1. 1

   Adipose Fin

   Unlike most characins, Hasemania melanura lacks an adipose fin. This is a key distinguishing feature.

2. 2

   Caudal Fin Markings

   The prominent black stripe extending from the caudal peduncle into the lower lobe of the caudal fin is diagnostic.

3. 3

   Body Coloration

   The coppery-gold to silvery-brown body color, often with iridescent scales, helps differentiate it from other small characins.

4. 4

   Size

   Adults typically reach a maximum standard length of 4-5 cm (1.6-2 inches).

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