| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | akvario | akvarioj |
| Accusative | akvarion | akvariojn |
| Catalan | aquari; aquàrium |
|---|---|
| Czech | akvárium |
| Danish | akvarium |
| Dutch | aquarium |
| English | aquarium |
| French | aquarium |
| German | Aquarium |
| Greek | ακουάριο; ενηδρείο |
| Hungarian | akvárium |
| Icelandic | fiskabúr |
| Papiamento | akuario |
| Portuguese | aquário |
| Russian | аквариум |
| Saterland Frisian | Aquarium |
| Spanish | acuario |
| Turkish | akvaryum |
| West Frisian | akwarium |