Corals eat plastic because they like the taste

For years, scientists thought corals accidentally ate the plastic debris that washed into their waters because they mistakenly took them for prey. But a new study from Duke University shows this is not the case: the plastic just tastes good.

Just like humans, corals are drawn to food that is bad for them, it would seem. The researchers tested corals they had collected off the North Carolina coast, by giving them a variety of options to eat, including bits of sand and plastic.

The plastic can’t be mistaken for prey because coral don’t have eyes, so they have no way of seeing what they are about to eat. The researchers think some of the chemicals found on the plastic might be making it taste nice to the coral.

While corals might like the taste of plastic, it does not mean it is good for them to consume it. Plastic is almost completely indigestible, so it causes blockages, create a false sense of being full, or reduce the energy reserves in animals that eat it. “About 8% of the plastic that coral polyps in our study ingested was still stuck in their guts after 24 hours,” says Allen.


“Ultimately, the hope is that if we can manufacture plastic so it unintentionally tastes good to these animals, we might also be able to manufacture it so it intentionally tastes bad,” Seymour says. “That could significantly help reduce the threat these microplastics pose.”