If you’ve noticed clusters of bright pink eggs in your garden, they might look harmless at first glance, but don’t be fooled.
These vibrant eggs belong to the invasive Apple Snail, a dangerous species that poses a major threat to local ecosystems.
Originally from South America, apple snails have spread worldwide, causing damage to plants, crops, and natural habitats. Keep reading to learn why these snails are a growing concern and how they can impact your environment.
Popular in Aquariums, but a Growing Pest
Apple snails are quite popular in aquariums, especially species like Pomacea bridgesii and Pomacea diffusa. People like them because, unlike most snails, they don’t eat the plants in the tank.
They are also popular in aquariums due to their unique appearance and size. Some species can even grow up to 6 inches (15 cm), about the size of a baseball or a human fist, making them one of the largest freshwater snails in the world.
Some people also call them mystery snails or spike-topped apple snails. They come in a variety of colors, including brown, albino, yellow, blue, purple, pink, and jade, and sometimes feature interesting banding patterns.
But while they’re a hit in the aquarium world, some Apple Snail species are actually considered pests in nature, where they can damage plants and crops. Interestingly, in some places, apple snails are even eaten and treated as a delicacy.
Why Are Apple Snails So Invasive?
Recognized as one of the 100 worst invasive species globally, apple snails have the potential to wreak havoc on local ecosystems, outcompeting native species and damaging aquatic habitats.
As global temperatures rise, apple snails have been able to migrate to regions where conditions are more favorable. They thrive in wet environments like ponds, lakes, and swamps, especially in warmer climates, and have even adapted to survive on land.
They’re well-suited to tropical regions where there’s a mix of dry and rainy seasons. These creatures even have the ability to move across land, using a special “lid” (the operculum) to seal their shells and avoid drying out while they wait out dry periods buried in the mud.
Irresponsible Aquarium Dumping
Apple snails are native to regions like South America, Central America, and the West Indies. However, when they spread beyond their natural habitats, they can cause significant environmental problems.
The introduction of apple snails to the United States is largely due to irresponsible aquarium dumping. Reported as early as the 1970s in Texas, they’ve since spread to numerous states. Louisiana documented their presence in 2006.
“The main idea is that they often get a little too large or maybe too abundant, and for whatever reason the aquarium owner decides they don’t want them anymore,” explains Bill Walton, a specialist at the Alabama Cooperative Extension System.
“So they decide to just release them into the waterways.”
From Culinary Ambition to Global Invasion
The apple snail problem isn’t new.
In the 1980s, a species of apple snail was introduced to Taiwan with hopes of launching an escargot industry. The goal was to provide alternative protein sources for farmers, who largely depended on rice for their livelihoods.
However, what seemed like a good idea turned into a disaster. Not only did the snails fail to become a popular food choice—at least not for the locals—they also brought with them an unpleasant surprise: a parasite known as Angiostrongylus cantonensis. This parasite can be dangerous to humans if the snails aren’t cooked properly, posing serious health risks.
To make matters worse, instead of helping local farmers, the snails began to threaten Taiwan’s rice crops and disrupt delicate ecosystems. As if that wasn’t enough, the snails spread rapidly across Asia and made their way to Hawaii, where they caused further damage to local agriculture and the environment.
