Dolphins 🤝 Humans
documents in depth how the two species work together, and how it leads to increased catches. The team used hydrophones, underwater cameras, and drones to watch the interaction in real time. They then conducted long-term demographic surveys of the dolphins, and interviewed and observed the fishers to better understand the short- and long-term consequences of this practice for both mammals.
According to the results, working together raises the probability of catching fish and the number of fish caught. The dolphins who engage in cooperative fishing also have a 13 percent increase in survival rates. When the dolphins are present, the fishers are also 17 times more likely to catch mullet and they also catch nearly four times more mullet.
“We knew that the fishers were observing the dolphins’ behavior to determine when to cast their nets, but we didn’t know if the dolphins were actively coordinating their behavior with the fishers,” said study co-author Mauricio Cantor, a biologist from Oregon State University’s Marine Mammal Institute,. “Using drones and underwater imaging, we could observe the behaviors of fishers and dolphins with unprecedented detail and found that they catch more fish by working in synchrony.
Traditional cooperative fishing between Lahille’s bottlenose dolphins and artisanal net-casting fishers in Laguna, Brazil. CREDIT: Mauricio Cantor, Department of Fisheries, Wildlife and Conservation Sciences, Marine Mammal Institute, Oregon State University. On the water, synchronized movements of flocks of birds and schools of fish are common, but this kind of synchronized behavior between species, like the
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