What is the meaning of "nine holes" in nine-hole abalone?

"Haliotis diversicolor" in Taiwan Province Province is referred to as "Haliotis diversicolor" and belongs to Mytilidae. The shell is thin and strong, with colorful patterns, which are very bright and pleasing to the eye. There are nine threaded holes on the back, so it is called nine holes. Nine caves are mostly produced in the coastal area of Taitung, Hualien, and are said to be authentic. Everything made in Taitung must have nine screw holes in the back shell; There are no nine screw holes in the north shell, which, more or less, should not be eaten by gourmets. You can tell at a glance that it's not really a nine-hole made in Taitung.

The advantage of nine holes is that they are fatter and more delicate than ordinary mussels. Eating one is one, which is very chewy. Unlike eating sea melon seeds, fresh is fresh, which is too difficult to satisfy. Nine holes coated with brine and dried on fire can best maintain their own flavor. Unfortunately, chefs in restaurants around East China are not very good at making nine holes, and they can't grasp the old and tender heat. They're fine. Nine times out of ten, they can't chew. If the ligaments are not removed, they may even plug their teeth. I really want to complain about the nine holes. Later, in Lijiayuan, Kaohsiung, I ate a nine-hole, which was old, tender and moderate, fresh and mellow, and it was a big chew.