August 26, 2021 — As climate change raises the ocean’s temperature, some fish species are moving poleward to cooler waters. In the United States, as elsewhere, commercial fishers are trying to adapt. But as a new study of trawler communities along the US east coast documents, fishers’ efforts to adjust are being constrained by a regulatory environment that isn’t adapting with them.
The research, led by Eva Papaioannou, a marine ecologist with the GEOMAR Helmholtz Centre for Ocean Research Kiel in Germany, looked at trawl fishing communities in 10 ports from North Carolina to Maine, where rising water temperatures have been especially pronounced.
Papaioannou and her colleagues dug into government records and vessel trip reports, examining decades of data about vessel activity patterns, distributions of fish stocks, and fish landings. They compared two periods, 1996 to 2000 and 2011 to 2015, and confirmed that the fish these communities are primarily targeting, fluke and hake, had shifted northward by up to 200 kilometers.
The scientists also interviewed members of these communities to find out how they were responding to their changing fishing grounds. “Fishers are on the water every day, so they see these changes, and they’re incredibly adept at dealing with variability,” says Becca Selden, a biologist at Wellesley College in Massachusetts, and a study co-lead.
The team found that the majority of fishers remained in their traditional grounds, but switched to targeting different, more abundant species. “Most prior work assumed that there wouldn’t actually be species switching,” says Selden. “But this was one of the dominant strategies that we observed.” As the scientists wrote in their study, this desire for “spatial stability” of fishing grounds was both the preferred strategy among all fisher communities surveyed, but also the most sustainable practice for local fish stocks.