sand tiger shark; gray nurse shark
Refers specifically to the species Carcharias taurus. In Japanese, the katakana name シロワニ is the usual written form.
The sand tiger shark is a species of shark that lives in temperate seas.
Katakana spelling is standard for this species name; usually written in kana.
Kanji form is rare and may not be widely recognized; the reading しろわに is the same.
The name シロワニ literally means 'white crocodile' (白 + 鰐), likely from its pale coloration and fearsome appearance. The exact origin of the name is uncertain.