SAN FRANCISCO — Jessica Vyvyan-Robinson was diving off Borneo when she was struck without warning by shock waves.

“I could feel it in my chest — like a dull, booming sound,” she recalled in an interview. After surfacing, her group learned that fishermen had detonated explosives.

The incident, which occurred a year ago, was Ms. Vyvyan-Robinson’s first encounter with blast fishing, a highly destructive technique used in impoverished pockets of the world.

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