Property rights and the protection of global marine resources

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Abstract

Managing global marine resources by assigning property rights could align economic and conservation incentives, but only if unauthorized resource use is deterred. Exclusive Economic Zones (EEZs) are country-level property rights to marine resources, covering approximately 39% of the ocean’s surface and accounting for more than 95% of global marine fish catch. However, EEZs might not be respected by unauthorized resource users because the cost of monitoring and enforcing such large areas may be prohibitive. Here we provide the first evidence that EEZs are in fact respected by unauthorized resource users. Using global, high-resolution fishing effort datasets and the ecologically arbitrary boundaries between EEZs and the high seas, we find that unauthorized foreign fishing is 81% lower just inside EEZs compared to just outside. Consistent with the high cost of enforcing EEZ boundaries, this deterrence effect is concentrated in EEZs that are most valuable near their boundaries. Our results suggest that property rights institutions can enable effective governance of global marine resource use.

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Fig. 1: Data processing example.
Fig. 2: Effect of EEZs on fishing effort.
Fig. 3: Unauthorized foreign fishing by EEZ-sea region.
Fig. 4: EEZ-sea regions that are more valuable near their high seas boundaries deter more unauthorized foreign fishing.

Data availability

All data used in the analysis are publicly available. In Supplementary Methods section 1, we describe the data used in the analysis in detail and specify how all data can be downloaded or obtained.

Code availability

Replication code is available at https://github.com/englander/replication_eez.

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Acknowledgements

I thank P. Berck, M. Auffhammer, S. Hsiang, D. Squires and J. Proctor for many helpful discussions. I thank D. Kroodsma, Global Fishing Watch, D. Palomares, G. Tsui and the Sea Around Us for sharing data. I thank C. Spindell Berck, J. Shrader, R. Walker, E. Frank, D. Kroodsma, K. Dunkle Werner, S. Eisenbarth, S. Villas-Boas and K. Siegel for further comments and suggestions. This work is supported by NOAA grant No. NA18OAR4170326, California Sea Grant College Program Project No. E/MRE-9.

Author information

G.E. conceived and designed the study, performed the analysis and wrote the paper.

Correspondence to Gabriel Englander.

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The author declares no competing interests.

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Supplementary information

Supplementary Information

Supplementary Methods, Figs. 1–10, Tables 1–4 and refs. 1–19.

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