Redtail Splitfin (Xenotoca Eiseni)

Definitive Redtail Splitfin Smart Guide

Redtail Splitfin (Xenotoca Eiseni)

Redtail Splitfin (Xenotoca Eiseni)

Quick Guide:

  1. Scientific Name: Xenotoca Eiseni
  2. Origin: Mexico
  3. Size: Males 6cm/ 2.5 inches. Females are slightly larger.
  4. Diet: Anything. They are not picky.
  5. Tank Size: 15 Gallons
  6. Temperature: between 15 and 30 °C

Outer Appearance:

They are called “redfin,” as you can see in the picture, the color of this fish is extremely variable. Some have reddish-orange tails, while others have yellow. There are strains that have been bred to have a coppery red throughout their body, while other breeders have concentrated on bringing out the blue coloration.

Several decades ago, this was a popular livebearer and breeders took an interest in it but it has all but disappeared from fish stores.

Why? Well, despite being very hardy and easy to breed, these fish have a reputation for being aggressive.

However, it is only partially justified. Individuals can demonstrate a range of aggression from none at all too mildly nippy to outright killers.

Most sources seem to agree that they can be especially aggressive towards catfish, attacking their eyes and fins. Corydoras are particularly vulnerable to attack.

Tank Setup:

Most people who keep them prefer to raise them in a species rank to avoid potential problems. They do not need a large tank. A 15 gallon of a 55-liter tank will suffice for a small group.


Very hardy. Any temperature between 15 and 30 °C will suffice. (59-86°F). Because of the temperature range, they are excellent candidates for summering outside.


They look best in thickly planted tanks but in nature, they can be found in many habitats, from fairly rapid streams to stagnant polluted roadside ditches.


Livebearers, but they differ from the more common livebearers in many ways. First, the females have no gravid spot indicating they are pregnant. The females cannot store milt like guppies but must mate for each pregnancy. It takes 7 to 8 weeks for the babies to develop. Between five and fifty large babies are born each time. Redtail Splitfins do not eat their own kind. The common name, Splitfin, refers to the males anal fin of which the first rays are modified for reproduction.

You may also interested to read about jerdons Baril.

  1. Freshwater Jerdon’s Baril – Fish Care Guide & Facts


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