The response of mesopelagic organisms to artificial lights

Though mesopelagic fish respond to natural light (e.g., diurnal vertical migration), few studies have looked at how they artificial and if lights could be used in commercial operations improve catchability of fish. Here we present a preliminary study on organisms blue green spotlights, as well red white diffuse Masfjorden (Norway; max depth 480 m). The response each the three sound scattering layers (SSLs) was observed when a) were positioned layer or b) moved with constant speed (generally 0.03 ms−1) towards layer. attached rig self-contained echosounder, which recorded horizontal avoidance SSL different lights. Net hauls (MIC-net) video footage confirmed that Maurolicus muelleri siphonophores upper (100–150 m), while Benthosema glaciale deeper (∼200 m ∼300 seabed). Our findings suggest M. (SSL1) horizontally avoid spotlight light, B. (SSL2 SSL3) mainly same downwards can herded over 250 m. this should regarded preliminary, avoidance/herding suggests applied existing capture methods for