Breakdown of Маленькая рыбка плавает в аквариуме.
Questions & Answers about Маленькая рыбка плавает в аквариуме.
Because рыбка is grammatically feminine, and the adjective has to agree with it.
- The noun рыба (fish) is feminine.
- рыбка is a diminutive of рыба, and it keeps the same gender: also feminine.
- Feminine singular adjectives in the nominative case usually end in -ая / -яя.
So:
- маленьк
- ая → маленькая (feminine, singular, nominative)
- If the noun were masculine, you’d use маленький (masc. singular nominative), e.g. маленький кот (a small cat).
Because рыбка is feminine, маленькая is the correct form.