Originally Posted by Davevanos
Crawfish actually glow bright white/blue when exposed to 365nm light. The light also seems to disorient/daze them, making it very easy to scoop them up with a net. This is the same phenomenon that you will see with scorpions, but it seems to be lesser known. Due to the wavelength, you cannot penetrate into deeper water(12 inches is probably the deepest a good light will penetrate) , but when shore hunting they light up like Christmas lights.

The same is true with ocean crustaceans like blue crabs and sand fleas, walking the beach at night with a 365nm light and it lights up all the hidden organisms like a scene out of avatar.

You can find fairly inexpensive lights on Amazon.

Thanks, Dave. Do you think this would work with grass shrimp?

7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160