What do fishers exploit regarding shrimp attraction to artificial illumination?

Many species of shrimp are naturally drawn to light, which fishers use to concentrate them for easier netting or trapping.

The principle behind using artificial illumination during nighttime shrimping activities is directly tied to the biological phototactic response of many shrimp species. Fishers deploy strong lights onto the water surface or use submersible lamps specifically because shrimp exhibit a natural inclination to swim toward this illumination. This concentration effect is highly advantageous for harvesting, as it gathers the target crustaceans into a smaller, more manageable area, making the process of netting or trapping them significantly more efficient than searching wide, dark expanses of water.