A fishing net or trap designed to snap or clap shut suddenly, capturing fish inside.
From 'clap' (to close rapidly) + 'net' (mesh trap). Common in British and Northern European fishing traditions, particularly for capturing smaller fish and eels.
A good clapnet could be worked by one person and required only river knowledge—medieval fishermen used them to feed entire villages from single waterways that today are overfished or polluted.
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