In the 1970's, people who managed ponds had a problem with plants and snails in the water. To control the pests, the managers brought four species of carp, a type of fish, from Asia. But some of the fish escaped into rivers and other waterways. Soon, there were lots of fish. And they became troublesome invasive species. These non-native fish can bully ecosystems, quickly taking over. Growing fast and big, they ate lots of the food on which the native fish would normally depend. Bighead carp are an invasive species in the United States. Wang is using a combination of computer modeling and field experiments to study how the eggs of these and other invasive carp could be transported in the Missouri River.
Today, the descendants (后代) of those carp remain a big problem. And as the fish spawn（产卵）, their eggs have been drifting (漂流) far and wide. Anticipating where something will drift can be a challenge. But finding answers may handle the crisis.
At the University of Missouri in Columbia, civil and environmental engineer Binbin Wang is working to figure out where eggs of the invasive fish are spreading in the Missouri River. If science can get ahead of the problem, there's hope that people may figure out how to stop it. But if science is too slow to answer this question, legions of carp eggs will grow into adults that outcompete their neighbors. Stopping their spread would help reduce the overall damage they cause.
Drifting may seem somewhat random, but scientists are doing researches to make useful predictions possible. Some of these drift detectives want to know if large icebergs threaten offshore oil platforms. Others hope to track the polluted air or water — and determine where they're coming from. The work is challenging. It also can be very rewarding. Most importantly, their findings may point toward solutions for some important environmental threats.