U.S. Fish and Wildlife Service (USFWS)’s Post

When you picture fish sampling, you might think of nets or electrofishing. Light traps are less familiar gear. Light traps are deployed by our biologists in backwater areas and small tributaries that could serve as nursery habitats for larval fish. Each trap is outfitted with a green LED light. Like insects at your porch light, plankton, small fishes, and aquatic invertebrates will be attracted and enter the trap overnight. The Oklahoma Fish and Wildlife Conservation Office is currently using light trapping to determine whether bighead and silver carp are successfully spawning in the Red River system in TX and OK. Thank goodness for good microscopes and genetics tests to help us identify these little eyelash-sized fishes! Photos: USFWS

  • a biologist throws out a light trap attached to a rope from the edge of a research boat into a river
  • two round white canisters float just under the surface of a river, attached to an orange buoy.
  • the resulting sample from light trapping efforts showing dozens of tiny fish fry and small water invertebrates

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