Egger stresses that TOC wants to make sure its plastic-cleaning efforts are helping marine life, not harming it. But it’s more complicated than simply trying to minimize the amount of marine life taken out of the ocean along with plastic, he says. If crustaceans or sea anemones from other regions cling to plastic debris and hitch a ride to the middle of the Pacific Ocean, they could feed on neuston there.
This isn’t surprising, says Martin Thiel, a professor of marine biology at the Catholic University of the North in Chile. Marine organisms have been foundall sorts of floating materials in the ocean, including volcanic pumice, seaweeds, and wood, at least until these items start to degrade and sink. Whether it’s organisms that settle on more durable plastic debris or that float at the surface next to it, Thiel says that they can’t simply be separated from plastic.
Lanna Cheng, professor emerita at the University of California, San Diego, is somewhat less concerned. Sometimes neuston are floating among plastic, sometimes not. Some neuston are able to swim up and down. And storms can come along and mix things up. Because neuston aggregations appear to be so patchy, accidental catches would likely not significantly affect their populations, she says.
The two sky-blue ships are currently cruising across the Great Pacific Garbage Patch again, testing the updated barrier in the hope that they can collect more plastic per trip. Ridding the open ocean of plastic remains a Sisyphean task. As more plastic enters the patch, and scientists learn more about the creatures living there, TOC still has many obstacles to overcome before it can scale up its operations.