Ostracion Cubicus: yellow boxfish

Ostracion Cubicus: yellow boxfish

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Ostracion Cubicus: yellow boxfish, sheetand behavior in the aquarium. Things to know (is it poisonous?), Nutrition and tips for managing the tank.

After talking about thehorned boxfish(yes, it is poisonous to other fish as it can release a lethal toxin when threatened or before death), I'll talk more aboutboxfishand I will do it with theyellow polka dot boxfish, the Ostracion Cubicus. The card and details of the horned boxfish (Lactoria cornuta) are indicated at the end of the page.

Ostracion cubicus and Lactoria cornuta

Both species are known asyellow boxfish or simplyboxfish. These are two species with a different appearance but with similar needs. For example, both species can consume cyanobacteria (very useful in the tank) but both species are dangerous.

Poisonous boxfish

Rather than talking about poisonous fish, we should talk about demanding species to be introduced into the tank with caution. Both Ostracion cubicus and Lactoria cornuta can release a toxin that is lethal to small fish if they feel threatened, excited or close to death.

Activated carbon can remove this toxin, however it may be too late for other fish in the tank. The toxin in question takes the name of the genus "Ostacion", it is called "ostracytoxin" and makes these twoboxfishunpredictable.

Ostracion cubicus or yellow polka dot boxfish

Let's start with the taxonomic classification.

  • Order: Tetraodontiformes
  • Suborder: Tetraodontoidei
  • Family: Ostraciidae
  • Genre: Ostracion
  • Species: Ostracion cubicus
  • Common name:yellow polka dot boxfish

It is loved for its yellow color. However, it is important to underline that only the smallest specimens have a yellow polka dot body. Theboxfish Ostracion cubicus, once adult, it takes on a different color: yellow turns towards ocher-orange or ocher-greenish. Younger specimens may have blue polka dots or black polka dots, while in the adult they are more spaced and less defined dark spots.

For its survival it is necessary to introduce it in well-established tanks and above all with large spaces that the fish can use for swimming. In short, it is only suitable for large and very quiet aquariums. The presence of aggressive fish or fish that are too fast could undermine the tranquility of theyellow polka dot boxfishthatexcitedorthreatened, could release ostracytoxin.

Yellow boxfish: card

Ostracion cubicus: complete fact sheet

Origins and habitat
It is native to the regions of the Indo-western Pacific Ocean, in particular the Red Sea, Hawaii and Tuamotu, from Southern Japan to Lord Howe Island. In these geographical areas thebox fishit rediscovers its habitat among semi-protected reefs, lagoons and coral reefs rich in acropora, usually at a depth between 1 - 15 meters.

Ostracion cubicus, feeding
In nature it feeds on algae, benthic invertebrates and small fish. In the marine aquarium it is appreciated because it is one of the few fish that loves to eat cyanobacteria.

If introduced into the aquarium, you will have to be careful to vary its diet by administering both plant-based and animal-based foods. Theyellow boxfishit needs to be fed several times a day (at least two meals). Avoid feeding floating foods because likehorned boxfish(Lactoria cornuta), this can also ingest air and have problems with balance and buoyancy.

Boxfish: aquarium

Because of its toxin, if you notice abox fishstressed or in poor health, best if you remove it from your tank and quarantine it.

In the aquarium, it can annoy small fish and invertebrates (in practice it can eat the smaller fish you have in the aquarium, if you have gobiodons or other very small fish be careful!), As well as feed on spontaneous algae (micro and macro algae).

Its needs in the aquarium see:

  • Acclimatization times of at least 30 minutes
  • Ideal temperatures between 22 - 26 ° C
  • Salinity: 1,020 - 1,026
  • pH: 8.0 - 8.5

Dimensions: 45 cm in nature but in the aquarium it rarely exceeds 20 cm.

In the aquarium it can eat polychaetes, small molluscs, small crustaceans, fish and foraminifers.

Aquarium size: the tank must be very large, I'm talking about a minimum of 400 liters.

The young specimen does not bother corals, when it becomes an adult it can bother corals, anemones and even echinoderms.

Although his behavior is peaceful (and usually even the most aggressive fish do not bother him), he tends to be aggressive towards other boxfish.

Yellow fish: marine aquarium

If you are looking for a yellow fish for the marine aquarium, know that you can also count on the species:

  • Siganus Vulpinus (yellow fish with black and white head)
  • Gobiodon okinawae (small yellow fish)
  • Zebrasoma Flavescens (yellow surgeonfish)
  • Lactoria cornuta or cornuta boxfish (only suitable for very large saltwater tanks)

Video: Yellow Boxfish Ostracion cubicus (June 2022).


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  2. Sandon

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