nurse shark
Refers specifically to the species Ginglymostoma cirratum. The Japanese name literally means 'babysitting shark'.
I saw a nurse shark at the aquarium.
Katakana spelling is standard for this species name.
Kanji spelling is rare; the word is usually written in kana.
Compound of 子守 (komori, 'babysitting') + 鮫 (same, 'shark'). The name likely comes from the shark's docile nature, but the exact origin is uncertain.