Journal article

Salmon lice nauplii and copepodids display different vertical migration patterns in response to light

A Szetey, DW Wright, F Oppedal, T Dempster



Light is a fundamental environmental cue which influences the migration of many marine organisms. For the salmon louse Lepeophtheirus salmonis, light is believed to drive the diel vertical migration behaviour of their planktonic larvae. Salmon lice are of critical importance to the salmonid industry due to the damage they cause to wild and farmed hosts. Salmon lice larvae have an eyespot and are positively phototactic, yet how light intensity alters their vertical distribution remains unclear. Here, we tested how light intensity (0, 0.5, 10 and 80 μmol m−2 s−1), dispersal duration (1, 4 and 12 h) and release point (surface or bottom) influenced the vertical migration of salmon lice nauplii a..

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University of Melbourne Researchers


Awarded by Norwegian Seafood Research Fund

Funding Acknowledgements

We thank Lise Dyrhovden and MartinPeter Matre from the Matre Station, Institute of Marine Research, for assistance during experimental work. Georgia Macaulay and Andrew Coates from the University of Melbourne provided technical assistance. We thank Luke Barrett for assistance in the analysis of the experimental data. All experimental work was performed in accordance with the guidelines of the Norwegian Animal Research Authority (animal ethics permit [FOTS ID] #12935). Funding was provided by the Norwegian Seafood Research Fund to project #901283 `Utvikling av lakselus ved ulik temperature og lys (TEMPLUS)'.