Animal-World > Freshwater Fish > Characins > Blackskirt Tetra

Blackskirt Tetra

Black Tetra ~ Black Widow Family: Characidae Sub-family: Tetragonopterinae

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Gymnocorymbus ternetzi Photo © Animal-World: Courtesy David Brough

   First introduced into the United States in the 1930's, the Blackskirt Tetra is one of the most popular aquarium fish!

   The Blackskirt Tetra, also known as the Black Tetra or Black Widow, is a good fish for the beginner as it is very hardy, undemanding, and easily bred. It is a real beauty in a community aquarium. It is very active and fast moving though it can tend towards fin nipping. Because of this they should not be kept with smaller fishes, but will do very well in a community tank with larger fishes.

   Being a schooling fish the Blackskirt will appreciate the company of its own kind. How many fish make a school?... the standard answer is 7. They also like a well lit tank with dense areas of bunched low vegetation which will leave lots of open areas to swim in. They are hardy at 70° F to 90° F, but are prone to develop ick if kept in colder temperatures.

Various strains of the Blackskirt Tetra have also been developed:

• A long-finned variety, the Blackskirt Hifin Tetra, was first developed in Europe. It is also very popular and is readily available. These fish are a bit more difficult to breed than the Blackskirt Tetra, probably because of their being highly inbred already. They are also referred to as the Longfin Blackskirt Tetra, Long-fin Black Widow or Longfinned Black Tetra.
• Strains in a natural white, pink, and blue have also been developed. Of these the White Tetra or Goldenskirt Tetra has become very common followed by the Colored Skirt Tetra. It is sometimes artificially dyed in various pastels colors and sold as a Colored Tetra or under various colored names such as the Blueberry Tetra, Strawberry Tetra, or Rainbow Tetra.

For more Information on keeping this fish see:
Guide to a Happy, Healthy Freshwater Aquarium

Dream Aquarium Build your own aquarium The Coolest and Funnest Screensaver in the World.

Distribution:
   The BlackSkirt Tetra, also known as the Black Tetra or Black Widow, was described by Boulenger in 1895. They are found in South America in Paraguay and Guapore Basins where they inhabit the upper layers of the water feeding on worms, small crustaceans and insects. Many are captive bred for the aquarium industry.

Status:
   The species is not listed on the IUCN Red List.

Description:
   The Blackskirt Tetra is a deep-bodied species and laterally compressed. It is distinguished by two vertical stripes and by what appears to be overly developed dorsal and anal fins. These make it appear as if though it has a "skirt", with most of its mass on the bottom half of the body. The fine black color changes to a gray in the adult.

NOTE:
This fish is not to be confused with its' cousin, also called the Black Tetra Gymnocorymbus thayeri. G. thayeri is lighter with not as bold a coloration and lacks the vertical striping. It also has a more convex anal fin rather than rounding out. The Black Tetra is also a shyer fish and not as hardy as the Blackskirt.

Size - Weight:
   These fish get up to 2.25 inches (5.5 cm). Will breed at 1.5 inches.

Care and feeding:
   Since they are omnivorous the Blackskirt Tetra will generally eat all kinds of live, fresh, and flake foods. To keep a good balance give them a high quality flake food everyday. Feed brine shrimp (either live or frozen) or blood worms as a treat.

Water Region: Top, Middle, Bottom:
   These fish will swim in all areas of the aquarium.

Acceptable Water Conditions:
   Hardness: to 30° dGH
   Ph: 5.8 to 8.5
   Temp: 70-79° F (21-26° C)

Social Behaviors:
   They are active and can be semi-aggressive fin nippers. They should be kept in a community aquarium with fish the same size or larger. With age they become a more sedentary fish.

Sexual Differences:
   The male's dorsal fin is more narrowed and more pointed. Also, the male's frontal portion of the "skirt" or anal fin is noticeably broad while the female's "skirt" tends to run parallel to the stomach line. A mature female is also more plump.

Breeding/Reproduction:
   The Black Tetra, Black Widow, or Blackskirt Tetra are egg layers. They are easily breed with a good pairing. The biggest challenge is that the young are prone to starving to death if they are in a dark tank and can't find a food source. The fry should have plenty of light, both day and night, until they are large enough to eat freshly hatched brine shrimp.    See the description of how to breed these fish in Breeding Freshwater Fish.

Buy Black Skirt Tetras From LiveAquaria.com

Photo Courtesy: Fish2U

Availability:
   The Blackskirt Tetra, also sold as the Black Tetra or Black Widow, is readily available.

Authors: David Brough, CFS and Clarice Brough, CFS

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Latest Comments
Hi All, I have a male betta fish, 2 neon tetras, 1 tiger tetra and 1 black tetra and they seem to all get along. My male betta fish is so friendly, he is one of a kind. He even lets me pet him! The black tetra, is a little aggressive towards all of them. I saw him nipping on my betta fish yesterday at his tail but my beta just turned around and swam away like it didn't bother him at all. I just added the tetras last Friday (halloween) and at first the black tetra was calm and now he is starting to get on my nerves. All I have to say is if he keeps being mean to the other fish, my cousin has a lion fish and I will feed him to the lion fish! ha ha ha =) Black tetras are nice looking but be careful with them because they can be aggressive. Kim 2008-11-05
I used 2 black skirts to stabilize my first 10 gallon tank, and they got fairly aggressive. The only things they didn't eat were bottom feeders. After I upgraded to a 25 gallon tank though, and added a whole school of neon tetra's, they finally quieted down. Heather 2008-05-21
I have a Blackskirt tetra. I named him Zippie. He got that name because he zips around the tank. I have Zippie in with my 3 goldfish. They get along just fine. I love to watch Zippie swim. He makes me dizzy. I think the Blackskirt tetra is cool. kathy 2007-11-16
I have a 10 gallon tank which includes two cory catfish, one Chinese algae eater, one female betta, and Angelique- the fin-nipping bully. I was wondering why Rose, my betta, would puff out her cheeks and fins like a lion and charge Angie- then I caught Angie harrassing Cory & Harold (my catfish) last night. She has been an absolute terror. She even bears her teeth and chomps them at me (so it seems). I know you all have said this behavior is fairly harmless, and in fact, Rose still has all of her fins & no one looks nibbled upon, but I am worried about their stress levels. Stressed fish are not happy fish. I think I will try some of the advice I have seen on this page and get her a companion. At the worst, they can batter one another and leave everyone else in peace. Yeesh. What a soap opera going on in the fish tank! Jocelyn 2007-09-16
I love these fish! I've had a school of these fish over five years & never lost a one. Even after a November icestorm where the the little guys were left in 40 degree water for five days they all survived & kept on kickin' even when everything else except my sisters white clouds died. A great fish indeed. Arnold 2007-07-26
Some of the coolest comments:
Have 11 of these active and nice fish in my heavily planted 30 gallon. They are rambunctious dancers when they see their dinner coming and always hungry for more any time of night or day it seems. Their tank offers plenty of plants on a CO2 controller and a nice mopane bog wood root. Tankmates include two pearl gouramis and a handful of cories which they all mostly ignore in favor of thinking about food and feeding times and whether anyone walking by might have a morsel for them. Very nice to see that tank so lively again, those two particular pearls hide their lives away, so the blackskirts give the tank life now. Great fish, pleasure to have. Deedee 2005-03-03
Comments Dr Jungle REALLY Likes to Hear!
The info here is very helpful to us newbie aquarium hobbyists. We just started our 20 gallon high tank with three Black Tetras. At first they were reserved and confined themselves to an area of cover. We are one day into this now, and they are more comfortable, alternate between hanging around the plastic leaves and darting around, occasionally nipping at each other. We are told to wait at least a week before adding more fish. We had a false start dealing with a chain pet store before we wised up and visited a real fish store with expert advice. -Bob in St. Clair Shores, Mich. Bob Doetsch 2005-04-06

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