Long-term stability of Sphyrion lumpi abundance in beaked redfish Sebastes mentella of the Irminger Sea and its use as biological marker
| Autor: | Regina Klapper, Julia Wischnewski, Matthias Bernreuther, Sven Klimpel |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Male Redfish Fish species Fisheries Metapopulation 01 natural sciences Copepoda Fish Diseases Animals Atlantic Ocean Sphyrion lumpi General Veterinary biology 010604 marine biology & hydrobiology Pelagic zone 04 agricultural and veterinary sciences General Medicine biology.organism_classification Perciformes Fishery Infectious Diseases Insect Science 040102 fisheries 0401 agriculture forestry and fisheries Parasitology Female Sebastes Fisheries management Copepod Biomarkers |
| Zdroj: | Parasitology research. 116(5) |
| ISSN: | 1432-1955 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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