Illuminating the planktonic stages of salmon lice: A unique fluorescence signal for rapid identification of a rare copepod in zooplankton assemblages.

Monitoring of planktonic salmon louse (Lepeophtheirus salmonis salmonis) abundance and parameterization of key life-history traits has been hindered by labour-intensive and error-prone quantification using traditional light microscopy. Fluorescence illumination has been proposed as a means of improving visualization, but prior to this study adequate investigation of the relevant fluorescence profiles and measurement conditions has not been undertaken. We investigated the fluorescence profiles of L.

The relationship between the moon cycle and the orientation of glass eels () at sea.

Links between the lunar cycle and the life cycle (migration patterns, locomotor activity, pulses in recruitment) of the European eel () are well documented. In this study, we hypothesized that the orientation of glass eels at sea is related to the lunar cycle. The European eel hatches in the Sargasso Sea and migrates across the Atlantic Ocean towards Europe.

The planktonic stages of the salmon louse ( are tolerant of end-of-century CO concentrations.

The copepod is an obligate ectoparasite of salmonids. Salmon lice are major pests in salmon aquaculture and due to its economic impact is one of the most well studied species of marine parasite. However, there is limited understanding of how increased concentration of CO associated with ocean acidification will impact host-parasite relationships.