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These two parasite species have historically infected people in Southeast Asia who eat raw fish, crustaceans or vegetables that carry the parasite larvae.

Some crustaceans, for example, have a hard time developing hard outer shells made of calcium carbonate if the water is too acidic.

The suspects, aged 24, 26 and 27, and widely identified in Japanese media as being Chinese nationals, were detained on Amami, a southerly island where the spiral-shelled crustaceans are a protected species.

Aside from a few big-city retirees and holiday-goers, Cutler owes its existence to the bountiful crustaceans that inhabit the offshore waters.

Research published in 2023 found that a year after test seabed mining disturbed the ocean floor in Japanese waters, the density of fish, crustaceans and jellyfish in nearby areas was cut in half.