With food security and equity growing concerns in global fisheries—and one-third of commercial fish stocks being exploited at unsustainable levels, according to the United Nations—researchers have been tapping new data to get a better grasp of exactly who fishes where and how much they catch.

A paper published recently in the journal Science Advances found that rich nations are catching the lion’s share of the ocean’s fish, even in the waters of lower-income countries. The estimates feed into a bigger debate over how the wealth of the seas could be distributed fairly and sustainably.

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