Old Photo: A Fishing Dam?

Here's an old photo from 1910 taken in Luangprabang along the Nam Kan River, showing how they created an almost dam like structure made of bamboo to catch fish.  ການໃສ່ລອບທີ່ນ້ຳຄານຫຼວງພະບາງ1910 ການໃສ່ລອບນີ້ຕອ້ງໃສ່ເວລານ້ຳມາກ