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Another of the old time favorites, the Penguin fish has a look all its own. A peaceful and undemanding fish that makes a great addition to any community aquarium.

Quick stats:

Listed tank sizes are the minimum
Size:	Up to 2 1/2 inches (8 cm)
Tank:	24 inches
Strata:	Top, middle
PH:	5.5 to 7.0
Hardness:	Soft to hard dh range 4-20
Temperature:	73° to 82° F (22-28°C)

Classification:

Order:	Cypriniformes
Suborder:	Characoidei
Family:	Characidae
Genera:	Thayeria

Penguin Fish

Additional species photographs

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Distribution

Peru and Western Brazil, the Amazon basin.

A rather long fish with much lateral compression. The upper and lower profiles are very similar in appearance. The bottom of the rear fin (Caudal) is slightly longer, giving the penguin its one of a kind look.

A Black longitudinal stripe starts at the end of the gill cover plate and runs all the way to the base of the Caudal fin where it turns downward to the bottom tip of the tail fin. A shinny Gold colored line runs on either side of the thicker Black stripe. The upper main body color is a gold or bronze color and the lower body is a silver to gray color. The fins are clear with a slight Yellow tint and the front of the Anal fin has a milky front.

An easily cared for fish the penguin is omnivorous accepting flake, frozen and live food. The addition of some vegetable matter in the food is beneficial. They are adaptable to a wide range of water conditions, although it has been said that they are sensitive to high Nitrate levels. The tank should be loosely planted with plenty of open space for swimming. They swim at an angle facing up and are a schooling fish and should be kept in groups of at least six. An all around winner for the community aquarium.

Found in slow moving waters of the Amazon basin, among scattered patches of plants.

A very prolific breeder often having broods of over 1000, a fairly large breeding tank is needed. The water should be soft and on the acidic side (5.5). The substrate should consist of fine leafed plants to catch the large number of eggs. Females when ready to spawn have a very distended belly due to the large number of eggs. After spawning the pair should be removed and a portion of the water should be changed due to the large amount of sperm released by the male which could foul the water. The eggs hatch in less than a day and the fry are very small and need to be fed the smallest of foods available.

Penguin Tetra Click photo to buy Thayeria boehlkei

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From: Kana Date:12/28/09 I have a 20 gallon tank with 4 penguins, 2 corys, 3 black skirt tetras, and some neon and glowlight tetras. The penguins are the most peaceful of all my fish, and the rest are very peaceful also. I cannot understand why a penguin fish would be aggressive toward other fish, except for the fact that they do not have enough room. I have seen the most placid, peaceful fish be aggressive and territorial if there is not enough territory to go around. I have kept fish for a long time, and I think that the cramped areas are the thing that make fish most aggressive. From: Sissy Date:10/27/09 I have a school of six Penguin Tetras in my 55 gallon community tank. They share the space with many other tetras including harlequins, neons, cardinals, lemons, and black neons. There are many others including a Beta, guppies, and a school of marble hatchets. They all live peacefully together and I have never once seen them act aggressively towards any of my other fish. From: Danielle Date:10/12/09 I have a community tank containing 6 penguin tetras, 2 opaline gourami, 2 mollies, 2 clown loach and 1 lone neon tetra. The penguin tetra are really nice fish to watch and although mine do not school they are peaceful fish and I haven't had any problems with aggression towards the neon tetra. I love these fish and will be adding another 6 soon to see if they will school in a larger group. From: Laurent Date:06/15/09 I am very surprised with all the comments below! I have 16 tetra penguin in my tank along with guppies, cherry and amano shrimps and a couple of colisa lalia. I have them for 6 months now and despite they are very active they also are very peaceful with all their tankmates. They do not even eat the baby guppies! From: Eric Olson Date:05/03/09 I have to agree with the other comments on this species. For my first aquarium (10 gallon) I purchased 3 Cory Cats and 6 Penguin Tetras. At first everything was fine, but within a week each of the Penguin Tetras had established its own territory in the tank. The only time they would move around the tank would be to fight with one another or to feed; otherwise they would stay in the same position all day. They did leave the Corys alone, but I don't enjoy watching fish fight, and the tank was probably too small for that many Penguins anyway (my mistake), so I returned them to a local fish store where they are now in a large display tank where they are schooling nicely, probably because they are no longer the big fish in the little tank and they have bigger fish to worry about now. From: Peter Wignell Date:03/22/09 I put 3 penguin tetras in my tank a week ago. Other species in the tank are harlequin rasboras, cardinal tetras, black stripe tetras, yamato shrimp and 1 catfish. I only put in 3 penguin tetras. The schools of other fish all outnumber them. The day after I put the penguin tetras in the tank one of my harlequins was missing half its tail and subsequently died. Apart from that there hasn't been any other trouble. The penguins appear to have staked out a small area of the tank as theirs and chase other fish away but they aren't overly aggressive. From: Alvin Song Date:03/10/09 Penguin Fish are only peaceful among fishes larger than them. Totally unsuitable for community tanks with small tetras. In my planted tank, a school of 10 Penguin Fish has became extremely Aggressive towards other fish species: my white cloud mountain minnows, harlequin, badis badis, and even zebra danios. My recommendation is to have Penguin Fish with catfish species, snails, shrimps only. I find the description of Penguin Fish "peaceful in community tanks" absolutely hilarious. From: Graham Chalker Date:08/08/08 I have found the same with Penguin Tetras they can become very tank dominant and become aggressive towards other fish that swim in their water level. I have lost up to 12 small Guppies in the last month due to the Penguin Tetras so I will be passing them back to the shop. They seem to behave more when there is a larger more dominant fish in the tank i.e. an Indian Gourami or lace Gourami. I do not recommend these fish for community tanks with small fish. From: Julie Date:06/18/08 I have an 80 gallon tank, and in it I have about 14 cardinal tetras, 4 serpae tetras, 3 swordtails, 2 blue Moscow fancy guppies...and a few bottom feeders. We just introduced 6 penguin tetras today and I am not at all pleased. They're picking on my guppies like you wouldn't believe, and nipping at the fins of my serpaes (which are my favorites in the tank). I'm seriously considering taking them back to the pet store. They're not docile, nor are they peaceful. I'm shocked---I thought mainly all tetras were great community fish. These aren't. =( Take caution when buying these for your community tank, they seem to like long fins! From: Donna E. Date:02/29/08 I have found these fish to one of the more aggressive fish I have had. I had 5 in my tank, and they chased each other and their tank mates around constantly! One of the worst assaults was the removal of one male's entire tail fin. He survived for about 8-9 months, but it was only because he was able to hide in one of the plants. They all have missing scales and missing bits of tail and fins, and they killed 2 Honey Gouramis shortly after I introduced them to the tank. Nope, I would not purchase them again, even though they are quite beautiful. From: Lord Heath Date:3/22/07 Unfortunately, my experience with these fish has been largely negative. I have just had to get rid of mine because I find them aggressive towards other fish. They appear to chase other species of fish around the tank and yesterday I found 3 dead fish (1 zebra danio, 2 swordtails) and attribute the deaths to the Penguins. So naturally, I found your "peaceful" fish quite contrary to my own findings. From: Adrian Date:1/21/06 Penguin tetras are a peaceful and undemanding fish. They are best kept in a group as they are a shoaling fish. I have two pairs and they are happy with four pairs of tiger barbs and a pair of ghost. They eat all types of dried foods. From: Joe Date:2/06/06 These fish are one of my favorite tetras. They have nice colors, and a nice body form. The penguin tetra also love to just "hang out". I have 5 of them with some other tetras in a 45 gallon tank, and they love to just float in front of the glass. I have never seen these fish fight with other fish in the tank, but they would probably be attacked a lot if they are kept with more aggressive fish. I recommend these fish to people who are new at fish keeping, because the penguin tetra isn't demanding on when it eats, or what the water is like (just as long at the temp. is good and not too dirty).

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