Shell Shock!

Conch are invertebrates. A hard spiral shell protects their soft bodies (see Conch Anatomy). “There’s this massive shell and the most adorable eyes you can imagine peeking out,” says Andrew Kough. He’s a biologist at the Shedd Aquarium in Chicago, Illinois.

Conch gather in herds on the seafloor. They graze on tiny plant-like organisms called algae (AL-jee). Conch also eat dead seagrass. This helps keep the ecosystem healthy.

Conch are invertebrates. Each has a soft body (see Conch Anatomy). It’s protected by a hard spiral shell. “There’s this massive shell and the most adorable eyes you can imagine peeking out,” says Andrew Kough. He’s a biologist. He works at the Shedd Aquarium. It’s in Chicago, Illinois.

Conch gather in herds on the seafloor. They graze on algae (AL-jee). It’s a tiny plantlike living thing. Conch also eat dead seagrass. This helps keep the ecosystem healthy.

Conch move by pushing their bodies forward using their claw. The process is slow. It makes the snails easy to grab. “Conch can’t run away,” says Kough. Fishers can easily harvest large numbers of the animals.

Traditionally, fishers reached conch by snorkeling or holding their breath to dive. That limited the number of snails they could gather. Modern fishers have special gear for breathing underwater. That means they can dive longer and deeper to collect many more conch.

Conch push their bodies forward using their claw. They move slowly. It makes the snails easy to grab. “Conch can’t run away,” says Kough. Fishers can easily harvest large numbers of the animals.

Fishers used to snorkel or hold their breath to dive for conch. That limited the number of snails they could gather. Modern fishers have special gear. It allows them to breathe underwater. That means they can dive longer and deeper. That allows them to collect many more conch.

A few years ago, Kough and other scientists counted conch in the Bahamas. The researchers snorkeled while tied to boats that slowly towed them along. They examined 42 sites covering nearly a million square meters (10 million square feet) of the seafloor.

Kough and other scientists visited the Bahamas a few years ago. They counted conch there. The group snorkeled while tied to boats. The boats slowly towed them along. The scientists visited 42 sites. They studied nearly a million square meters (10 million square feet) of seafloor. 

The researchers then compared their count with previous ones dating back to the 1980s. They realized that the conch population had shrunk dramatically over the years. In some places, the number of adult conch had dropped by more than 90 percent.

Most of the conch left on the seafloor were juveniles. That’s a problem because only adult conch can reproduce (see Conch Life Cycle). If fishers remove too many adults, the conch population may not be able to support itself. If nothing changes, the scientists warned, conch could disappear from the Bahamas within a decade.

The scientists compared their count with previous ones. The counts dated back to the 1980s. The scientists found conch numbers had fallen greatly over the years. Adult conch numbers had dropped by more than 90 percent in some places. 

Most of the conch left on the seafloor were juveniles. Conch numbers can’t grow if fishers remove too many adults. That’s because only adult conch can reproduce (see Conch Life Cycle). Conch could disappear from the Bahamas within a decade if this continues.

Scientists say there’s still a chance to protect the conch’s future. One way is to create more protected areas where fishing is not allowed. Kough and Lundy think it could work. They worked on a study that found protected areas have larger numbers of mature conch. Their offspring drift into surrounding waters. That gives the whole population a boost.

Scientists say there are ways to help conch. One is to create more protected areas. Fishing would not be allowed in these spots. Kough and Lundy have studied these protected areas. They have larger numbers of adult conch. Their young drift into nearby waters. That boosts conch numbers in other areas.

The government of the Bahamas has considered limiting conch fishing season. And scientists are working closely with fishers to find ways to harvest conch sustainably. For example, conch farms, where people raise conch in tanks, are growing in popularity. Snails from farms can be used for food or released into the wild.

The fate of conch in the Bahamas is still uncertain. But scientists like Kough and Lundy believe that the snails can survive. “Conch is a part of the culture that is deeply cherished,” says Kough. “We don’t want people to stop eating conch—we just need to find ways to make those traditions sustainable.”

The government of the Bahamas has also thought about limiting conch fishing season. And scientists are working closely with fishers. They want to find ways to harvest conch sustainably. For example, people can raise the snails in tanks. These conch farms are becoming more popular. Snails from farms can be used for food. Or they can be freed into the wild.

The future of conch in the Bahamas is still uncertain. But scientists like Kough and Lundy believe the snails can survive. “Conch is a part of the culture that is deeply cherished,” says Kough. “We don’t want people to stop eating conch. We just need to find ways to make those traditions sustainable.”