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In southern New England, rapid ocean warming over the past two decades has caused substantial redistributions of fishes, invertebrates, and the fisheries they support. The rapid emergence of the warm water-tolerant Jonah crab (Cancer borealis) fishery, once discarded as bycatch from the now declining lobster fishery, illustrates a prime example of climate-adaptive shifts in southern New England fisheries. However, limited data exist on the basic life history of Jonah crabs, despite their growing economic and societal value. This hinders ocean management capacity to meet multiple ecological, economic, and socio-cultural goals of sustainable harvest. Off the southern coast of Rhode Island, Jonah crabs are currently harvested in two fishery zones (inshore and offshore) delineated as holdovers from the lobster management zones. Jonah crabs landed in the offshore fishing zone are significantly larger, on average, than those landed in the inshore fishing zone. This presentation gives an overview of a study developed to test the hypothesis that these size differences reflect ontogenetic migration of Jonah crabs from the inshore to offshore fishing zones. To do this, we developed seasonally resolved isoscapes (isotope maps) of the region, which revealed distinct geospatial gradients in environmental stable isotope values between inshore and offshore necessary to track potential movement of Jonah crabs between fishing zones. We then used stable isotope analysis of three Jonah crab tissues with differential metabolic turnover times: the carapace (reflecting residence one year ago), muscle (reflecting residence averaged over the last ~4 months), and hepatopancreas (reflecting residence averaged over the last ~4 weeks) to construct an “isotopic clock” of residence throughout the regional isoscapes. This work provides key data on critical life history characteristics of the Jonah crab through a collaborative effort by scientists at the University of Rhode Island and the Rhode Island Department of Environmental Management to inform management decisions on this emerging climate-adaptive fishery.
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This content will become publicly available on June 1, 2026
Brachyuran crab fisheries in Chile: challenges and opportunities for rising demand
Rising global seafood demand poses increasing challenges for sustainable fishery management. This is particularly the case in the Global South, where many small-scale fisheries are likely to expand as they gain access to larger markets. Using Chile as a case study, we assess brachyuran crab fisheries and provide a forward-looking view on the sustainability challenges of possible increases in demand by bringing together data on supply, demand, management, and, literature review. Dominated by two species (Metacarcinus edwarsii and Cancer porteri), production has centered in southern Chile and has fluctuated over the past decade, with landings declining since 2018. Between 20% and 30% of crab caught is exported, mostly to the United States and Belgium. In Belgium Chile is the third largest supplier. Few management regulations and monitoring programs exist. Limited spatio-temporal stock assessments, suggests the status of the dominant crab species may be jeopardized. Apart from ecology, the state of knowledge is limited across socio-economic, market, and fisheries management dimensions. There are initiatives to improve with an established Fisheries Improvement Project (FIP) in southern Chile. However, the lack of evidence of policy and management improvements has inactivated the FIP until the developed management plan proposal, based on an adaptive and precautionary approach (considering biological, ecological, economic, and social objectives) be approved by the government. This work reveals the importance of understanding the dynamics between supply and demand from holistic perspectives as well as the role of local efforts for resource sustainability in the context of increasing national and global crab demand.
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- PAR ID:
- 10653270
- Publisher / Repository:
- Springer Nature
- Date Published:
- Journal Name:
- Reviews in Fish Biology and Fisheries
- Volume:
- 35
- Issue:
- 2
- ISSN:
- 0960-3166
- Page Range / eLocation ID:
- 775 to 788
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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