May 14, 2026 — As lobsters migrate to colder waters due to climate change, Jonah crabs are becoming one of the most important species for fisheries in Southern New England.
“As the biomass of the American lobster declines due to climate-related changes and shifting ocean conditions, many fishermen have adapted by targeting other valuable species, and the Jonah crab has become a major alternative,” said Emmanuel Oyewole, a first-year Ph.D. student in the University of Rhode Island’s Graduate School of Oceanography. “The Jonah crab used to be considered a bycatch species and thrown back because lobster was so lucrative. As lobsters became less abundant, people started to realize that the Jonah crab is a viable and delicious alternative.”
Oyewole is conducting a study that is partly funded by a grant from The Nature Conservancy into how offshore wind farm structures are impacting the growth and habitats of Jonah crabs.
“Ecologically, Jonah crabs also play an important role in the marine food web,” said Oyewole, who is from Ilé-Ifẹ̀, Nigeria, a town in the southwestern part of the country. “They are both predators and prey, helping to maintain balance within benthic ecosystems. Because they are closely connected to seafloor habitats, they can help us understand how offshore wind farm structures may influence local biodiversity, habitat use, and the productivity of fisheries.”
When turbine foundations are installed on the seafloor, their hard surfaces become desirable habitats for marine organisms to attach, grow, and live, just as they do on natural rock or reefs. As algae, barnacles, mussels, and other small marine life, settle on these structures, these smaller organisms attract larger species such as crabs and fish that come to feed, hide, or seek shelter.