Mesopredatory fishes from the subtropical upwelling region off NW-Africa characterised by their parasite fauna

  • Eastern boundary upwelling provides the conditions for high marine productivity in the Canary Current System off NW-Africa. Despite its considerable importance to fisheries, knowledge on this marine ecosystem is only limited. Here, parasites were used as indicators to gain insight into the host ecology and food web of two pelagic fish species, the commercially important species Trichiurus lepturus Linnaeus, 1758, and Nealotus tripes Johnson, 1865. Fish specimens of T. lepturus (n = 104) and N. tripes (n = 91), sampled from the Canary Current System off the Senegalese coast and Cape Verde Islands, were examined, collecting data on their biometrics, diet and parasitisation. In this study, the first parasitological data on N. tripes are presented. T. lepturus mainly preyed on small pelagic Crustacea and the diet of N. tripes was dominated by small mesopelagic Teleostei. Both host species were infested by mostly generalist parasites. The parasite fauna of T. lepturus consisted of at least nine different species belonging to six taxonomic groups, with a less diverse fauna of ectoparasites and cestodes in comparison to studies in other coastal ecosystems (Brazil Current and Kuriosho Current). The zoonotic nematode Anisakis pegreffii occurred in 23% of the samples and could pose a risk regarding food safety. The parasite fauna of N. tripes was composed of at least thirteen species from seven different taxonomic groups. Its most common parasites were digenean ovigerous metacercariae, larval cestodes and a monogenean species (Diclidophoridae). The observed patterns of parasitisation in both host species indicate their trophic relationships and are typical for mesopredators from the subtropical epi- and mesopelagic. The parasite fauna, containing few dominant species with a high abundance, represents the typical species composition of an eastern boundary upwelling ecosystem.
Metadaten
Author:Katharina Alt, Thomas Kuhn, Julian Münster, Regina Klapper, Judith KochmannORCiD, Sven KlimpelORCiDGND
URN:urn:nbn:de:hebis:30:3-465829
DOI:https://doi.org/10.7717/peerj.5339
ISSN:2167-8359
Pubmed Id:https://pubmed.ncbi.nlm.nih.gov/30123696
Parent Title (English):PeerJ
Publisher:PeerJ, Inc.
Place of publication:London [u. a.]
Contributor(s):Jean-Lou Justine
Document Type:Article
Language:English
Year of Completion:2018
Date of first Publication:2018/08/08
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2018/08/30
Tag:Canary Current; Eastern boundary upwelling ecosystem; Food-web; Nealotus tripes; Subtropical East-Atlantic; Trichiurus lepturus
Volume:6
Issue:e5339
Page Number:21
First Page:1
Last Page:21
Note:
Distributed under Creative Commons CC-BY 4.0
HeBIS-PPN:450985482
Institutes:Biowissenschaften / Institut für Ökologie, Evolution und Diversität
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 59 Tiere (Zoologie) / 590 Tiere (Zoologie)
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0