Abstract
The main commercial fish species in the Irminger Sea, the beaked redfish Sebastes mentella, is commonly infected with the copepod Sphyrion lumpi. This ectoparasite is often used as a biological marker for stock discrimination to evaluate the still-debated metapopulation structure of beaked redfish. Nevertheless, it is still not understood whether parasite abundances and communities vary over longer time periods. In the present study, we investigated the abundance of S. lumpi in S. mentella of the pelagic zone of the Irminger Sea and adjacent waters. Our analyses revealed that live S. lumpi abundance remained constant during summer over a sampling period from 2001 to 2015, which confirms its validity as a biomarker. As S. mentella forms dense aggregations during mating, our results suggest that host densities are, regardless of a fishery-induced decrease in host biomass, large enough to facilitate the direct transmission of S. lumpi. After correcting for covariate effects, two stock units could be differentiated, which supports a continuation of the current fishery management strategy.
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Acknowledgements
We are grateful to all ship crews, scientists, technicians, and students from all expeditions and institutions in Iceland, Norway, the Russian Federation, and Germany whose data were used in this study. We would like to thank Dr. Judith Kochmann and Dr. Marc Taylor for their valuable comments.
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Klapper, R., Bernreuther, M., Wischnewski, J. et al. Long-term stability of Sphyrion lumpi abundance in beaked redfish Sebastes mentella of the Irminger Sea and its use as biological marker. Parasitol Res 116, 1561–1572 (2017). https://doi.org/10.1007/s00436-017-5433-y
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DOI: https://doi.org/10.1007/s00436-017-5433-y