Translation

The Japanese word for "Shark" is same サメ.

Romaji sa me
Hiragana
Katakana
Kanji
School Level

Loan-word

The word "Shark" katakanized would be shāku シャーク.
Romaji shaa ku
Katakanaシャ
Hiraganaしゃ

Further Reading

Wikipedia: Shark (サメ)