Longfin Glass Characin Tetra

Longfin Glass Characin – Tetra Fish Definitive Samrt Guide

Longfin Glass Characin Tetra

Longfin Glass Characin Tetra

Quick Guide For Beginners:

  1. Binomial Name: XenagoniatesBondi
  2. Origin: South America
  3. Fish Size: 8cm/3″
  4. Tank Size: 30 gallons/115 liters
  5. Water Temperature: 20-26°C/ 68-78°F

The Longfin Glass Characin tetra fish has been confusing me since I first saw it for sale online at a Korean website I sometimes shot at about a week ago.

At first glance, I thought it was species related to the glass catfish of Asia, but then I read the name which translated as Glass Characin.

The description accompanying the fish pointed out the similarity in shape to the glass catfish and noted that the fish they were selling lacked barbels and possessed an adipose fin on its back.

I was very interested in this fish, but I don’t like to purchase things that I have no information about. So I started trying to find it based on the Latin name they provided, Leptagoniates steindachaeri.

I found a few very brief sentences on it on Google stating only it was characin from South America. The two pictures available on Google, besides the ones from the website I was shopping at, seemed slightly different to me–less colorful in one case and more opaque in the other.

I decided to attempt a search under the collective name they listed. While nothing came up under glass characin, one option that appeared was the name Longfin glass tetra. Out of curiosity, I clicked that and found images that seemed to match “my ” fish much more closely. They were called Xenagoniates Bondi. I started researching that fish but found little, and contradictory information. For example, one website based in Columbia said X. Boni was from Columbia and Venezuela.

A British website said it was from Peru. Meanwhile, information on Leptagoniates mentioned vaguely that it is from the Amazon Basin.

I thought perhaps I was dealing with one species with two different Latin names, making one invalid, but then I read an academic journal article that mentioned Leptagoniates and Xenagoniates are sister taxa, meaning that they are both valid names for closely related genera.

Unfortunately, the purpose of that research was not to distinguish between the two, so the result is that I don’t know exactly what I am looking at. I am leaning in favor of X.bondi. Oh,… After researching this for several days, I went back to the website only to discover they were “sold out” despite their 3 for $50 price tag.

Temperature Tolerance:

According to one website they can tolerate waters between 20-26°C/ 68-78°F

What Do they Eat?:

Easy to feed. In nature, they eat aquatic insects, fish fry, and detritus. In captivity, they also eat all prepared foods. Since all of these fish are wild caught, I would make the majority of their food live or frozen.

In Which Environment They Like To live?:

In nature, it was mentioned on the Columbian website that they live among the roots of floating plants. Therefore the tank should include water lettuce, water sprite, hornwort, salvinia, etc. The substrate is unimportant, but leaf litter is beneficial. They generally live in still or slow moving water so the filter should not make too much current, but benefit from the addition of good aeration in their tank. I am guessing that a tank size of 30 gallons/115 liters would be sufficient for a group.

Thank Mates for Glass Tetra

They do not live in school but tend to shoal. The Korean website said these fish are very peaceful and kind tankmates include plecos and cories, but the British on said that they are fin nippers and that the males are territorial. However, it also noted that a larger group reduces the aggression the males show.


Probably egg-scatterers but nothing I read discussed reproduction. If anyone out there has kept this fish or knows anything about it, Leptagoniates or Xenagoniates, please add your comments! If they become available again, I almost certainly will get a group.


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One thought on “Longfin Glass Characin – Tetra Fish Definitive Samrt Guide

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