Shinnosuke Nakayama

All Publications

• Patterns of marine resource conflicts across Africa highlight need for fair access and benefit sharing for a blue economy ONE EARTH Selig, E. R., Achi, N., Sundnes, F., Wabnitz, C. C. C., Nakayama, S., Hjermann, D. O., Palacios-Abrantes, J., Spijkers, J., Hara, M., Isaacs, M., McClanahan, T. R., McKown, E., Mensah, A., Overa, R., Rustad, S., Thorarinsdottir, T. L., Tollefsen, A. 2026; 9 (4)

  View details for DOI 10.1016/j.oneear.2026.101644

  View details for Web of Science ID 001750561000001

• Leveraging port state measures to combat illegal, unreported, and unregulated fishing. Science advances Selig, E. R., Wabnitz, C. C., Nakayama, S., Park, J., Barnes, R., Blasiak, R., Borg-Costanzi, D., Golder, B., Jouffray, J. B., Leape, J., Decker Sparks, J. L. 2025; 11 (36): eads1592

  Abstract

  Illegal, unreported, and unregulated (IUU) fishing threatens the sustainability of fisheries and communities dependent on them. The Port State Measures Agreement (PSMA) is a key tool for combatting IUU fishing by foreign fleets, requiring standardized inspections, information sharing, and port denial. Using satellite data, we characterized how PSMA has affected high seas vessel behavior and identify opportunities to strengthen its impact. PSMA adoption has increased travel distances to the nearest ports in States not Party to PSMA and channeled more fishing effort to domestic and PSMA Party ports. However, domestic fishing fleets need greater attention because they constituted 66% of port visits in 2021. Among reflagged vessels, we also found a 30% increase in visits to PSMA ports by vessels shifting to domestic flags after PSMA entered into force, allowing them to avoid PSMA requirements for foreign vessels. Our results highlight the centrality of implementing consistent, effective port State measures across foreign and domestic fleets to address IUU fishing risks.

  View details for DOI 10.1126/sciadv.ads1592

  View details for PubMedID 40911676

• Decent work in fishing in a changing climate MARINE POLICY Tigchelaar, M., Jackson, B., Selig, E. R., Davis, A., O'Regan, E., Kristiansen, T., Nakayama, S., Boyd, D., Cheung, W. W. L., Rodriguez-Huerta, E., Williams, C., Sparks, J. 2025; 181

  View details for DOI 10.1016/j.marpol.2025.106846

  View details for Web of Science ID 001537526800001

• Who owns reefer vessels? Uncovering the ecosystem of transshipment in fisheries. Science advances Bengtsson, F., Jouffray, J. B., Nakayama, S., Zhivkoplias, E., Wabnitz, C. C., Blasiak, R., Selig, E. R., Österblom, H. 2024; 10 (41): eadn3874

  Abstract

  A central barrier to effective governance and accountability in fisheries is the limited transparency of corporate ownership. Transshipment-the transfer of catches, fuel, parts, or crew between fishing and cargo vessels known as reefers-is often criticized for its opacity and poor governance. Better insight into the beneficial ownership of vessels involved in transshipment and their operational patterns could lead to more effective management. Our study presents a publicly accessible database of reefers' owners, operators, and flags. We identified 569 individual reefers and found that Russian and Chinese owners control 26 and 20% of the global reefer fleet, respectively. Results also show that 65% of all reefer vessels fly the flags of Russia, Panama, or China. This high level of consolidation suggests considerable leverage for enhancing transparency and governance. Our findings highlight the potential for reforming existing transshipment practices through collaboration among owners, flag states, fishery regulators, and scientists.

  View details for DOI 10.1126/sciadv.adn3874

  View details for PubMedID 39392891

• Comparing spatial patterns of marine vessels between vessel-tracking data and satellite imagery FRONTIERS IN MARINE SCIENCE Nakayama, S., Dong, W., Correro, R. G. G., Selig, E. R. R., Wabnitz, C. C. C., Hastie, T. J. J., Leape, J., Yeung, S., Micheli, F. 2023; 9

  View details for DOI 10.3389/fmars.2022.1076775

  View details for Web of Science ID 000924607800001

• Rights and representation support justice across aquatic food systems. Nature food Hicks, C. C., Gephart, J. A., Koehn, J. Z., Nakayama, S., Payne, H. J., Allison, E. H., Belhbib, D., Cao, L., Cohen, P. J., Fanzo, J., Fluet-Chouinard, E., Gelcich, S., Golden, C. D., Gorospe, K. D., Isaacs, M., Kuempel, C. D., Lee, K. N., MacNeil, M. A., Maire, E., Njuki, J., Rao, N., Sumaila, U. R., Selig, E. R., Thilsted, S. H., Wabnitz, C. C., Naylor, R. L. 2022; 3 (10): 851-861

  Abstract

  Injustices are prevalent in food systems, where the accumulation of vast wealth is possible for a few, yet one in ten people remain hungry. Here, for 194 countries we combine aquatic food production, distribution and consumption data with corresponding national policy documents and, drawing on theories of social justice, explore whether barriers to participation explain unequal distributions of benefits. Using Bayesian models, we find economic and political barriers are associated with lower wealth-based benefits; countries produce and consume less when wealth, formal education and voice and accountability are lacking. In contrast, social barriers are associated with lower welfare-based benefits; aquatic foods are less affordable where gender inequality is greater. Our analyses of policy documents reveal a frequent failure to address political and gender-based barriers. However, policies linked to more just food system outcomes centre principles of human rights, specify inclusive decision-making processes and identify and challenge drivers of injustice.

  View details for DOI 10.1038/s43016-022-00618-4

  View details for PubMedID 37117898

• Who directs group movement? Leader effort versus follower preference in stickleback fish of different personality BIOLOGY LETTERS Nakayama, S., Harcourt, J. L., Johnstone, R. A., Manica, A. 2016; 12 (5)

  Abstract

  During collective movement, bolder individuals often emerge as leaders. Here, we investigate whether this reflects a greater propensity of bold individuals to initiate movement, or a preference for shy individuals to follow a bolder leader. We set up trios of stickleback fish comprising a focal individual who was either bold or shy, and one other individual of each personality. We then recorded the movements of all individuals in and out of cover in a foraging context to determine how assiduously the focal fish followed the movements of each other partner. We found that a shy focal fish preferred to follow a leader whose personality matched its own, but we did not detect such a difference in bold fish. Despite this preference, however, the greater propensity of bold individuals to initiate movements out of cover meant that they successfully led more joint trips. Thus, when offered a choice of leaders, sticklebacks prefer to follow individuals whose personality matches their own, but bolder individuals may, nevertheless, be able to impose their leadership, even among shy followers, simply through greater effort.

  View details for DOI 10.1098/rsbl.2016.0207

  View details for Web of Science ID 000378308800015

  View details for PubMedID 27194292

  View details for PubMedCentralID PMC4892248