Japan marine mystery solved: A crab lived in a plastic bottle until it grew too large to escape

Japan marine mystery solved: A crab lived in a plastic bottle until it grew too large to escape explains how researchers traced an unusual case of marine life trapped in packaging. A crab was recovered off Okinawa, Japan, inside a plastic bottle made from high-density polyethylene, reportedly identified as a drifting Shaoxing wine bottle. The bottle’s opening was too small for the crab’s body size when it was found, leading researchers to conclude it had entered as a juvenile and fed inside for weeks, potentially for about two months. The team from Hiroshima University observed the bottle about 500 meters off Sesoko Island while surveying juvenile fish. By examining the crab’s stomach contents, they found evidence it ate algae growing in the bottle and also young fish that entered. The researchers estimated the bottle’s drift time using goose barnacles attached to the bottle’s exterior. The find underscores one-way trap risks that worsen plastic pollution effects on coastal ecosystems and fisheries.