The fishery resources in the waters near Vanuatu, an island country in the South Pacific, are rich in fishery resources. They are not only of various types, but also of high quality. Among them, the most famous one is a large sea shell called Tridacna. It is said that among all sea shells, only giant clams can grow precious black pearls, and the black pearls produced in Vanuatu are plump and lustrous, and are sought after by dignitaries all over the world, and their prices have skyrocketed. 　　 Hundreds of giant clams are caught every day in Vanuatu, but only a few will grow black pearls. However, the shells…