Overview
- Researchers recovered the live three-spot swimming crab inside an uncapped polyethylene Shaoxing wine bottle about 500 meters off Sesoko Island, Okinawa, in July 2022, during juvenile fish surveys.
- Measurements showed the bottle mouth was roughly 24 millimeters while the crab exceeded 40 millimeters in length and about 90 millimeters in width, meaning the animal must have entered when much smaller and later could not escape.
- Goose barnacle growth on the bottle’s exterior was used to estimate a drift time of about 62 days and DNA sequencing of the crab’s stomach contents identified recent consumption of juvenile fish species and algae.
- The bottle’s uncapped design let seawater and organisms move in and out, enabling a small living community that sustained the crab as it grew and illustrating how floating plastic can become an unintended microhabitat and entrapment risk.
- Authors Sato and Sakai note similar cases in Japanese waters and frame the finding as a clear, relatable example of how single-use plastics can harm small marine animals and influence public understanding and cleanup priorities.