Scallop is the name for the bivalve mollusk of the genus Scallopus, with about 400 species. More than 60 species of this family are one of the important marine fishery resources around the world. The shell, meat and nacre have extremely high utilization value. Many scallops are eaten as a delicacy. Scallops with bright colors and radiating patterns are loved by collectors, and the patterns have been adopted as patterns for artworks. Scallops are a family in the order Pterostilbeta of the order Pterozoa of the class Bivalvia. They are widely distributed in various sea areas around the world, with tropical seas having the most abundant species. About 45 species have been discovered in China, among which the Chlamydia scallop in the north and the Zhikong scallop in the south and the long-rib sun and moon clam are important economic species. Scallops, also known as sea scallops, have delicious meat and rich nutrition. After their adductor muscles are dried, they become "scallops" and are listed as one of the eight delicacies.

The shell is slightly oblate, with a smooth surface; gray-yellow or yellow-white, blue-gray on the back, with white fine lines; most have orange-red fine lines, some have gray-green or blue-gray on the back, and a few have 3 inconspicuous dark bands with brown spots. The smell is slight and the taste is salty.

Sakhalin Makka clam (scientific name: Pseudocardium sachalinense), also known as northern clam, arctic clam, and basil clam. A type of shellfish from the Makidae family, it is one of the important edible shellfish in Japan and nearby countries. It is a representative product of Soma City, Fukushima Prefecture, and is also listed as the city shellfish of Tomakomai City, Hokkaido. As an aquatic product, it is often called Hokki scallop. The name comes from "ポキセイ" in the Ainu language of Hokkaido dialect.