Refers specifically to the Japanese scallop (Patinopecten yessoensis), also known as ホタテガイ.
See also: ホタテガイ
Japanese scallops are often caught in Hokkaido.
Refers to the giant clam (Tridacna gigas), also known as シャコガイ. This usage is less common and may be considered a misapplication or regional variant.
See also: シャコガイ
Giant clams can sometimes be seen in the seas of Okinawa.
noble scallop
Katakana spelling is common for this shellfish name.
Kanji spelling is rare; the word is usually written in kana.
Compound of 扇 (おうぎ, 'folding fan') + 貝 (かい, 'shellfish'), referring to the fan-like shape of the scallop shell. The extension to giant clam may be due to similar shell shape.