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Title: Analysis of potential drivers of spatial and temporal changes in anisakid larvae infection levels in European hake, Merluccius merluccius (L.), from the North-East Atlantic fishing grounds
Authors: Diez, Guzman; Chust, Guillem; Andonegi, Eider; Santurtun, Marina; Abaroa, Carmen; Bilbao, Elisabete; Maceira, Arantza; Mendibil, Inaki
Citation: PARASITOLOGY RESEARCH, 2022, 121, 1903-1920
Abstract: We analysed the spatial and temporal variability of Anisakis larvae infection in hake (Merluccius merluccius) from the North-East Atlantic from 1998 to 2020 and the potential drivers (i.e., environmental and host abundance) of such variation. The results showed that hake from separate sea areas in the North Atlantic have marked differences in temporal abundance levels. Hake larger than 60 cm were all parasitized in all ICES (International Council for the Exploration of the Sea) subareas 6, 7, and 8. The belly flaps were the most parasitized parts of the flesh, accounting for 92\% of the total. Individuals of Anisakis simplex, Anisakis pegreffii, Anisakis spp. and a hybrid of Anisakis simplex x pegreffii were genetically identified, and Anisakis simplex as the most abundant (88-100\%). An ecological niche model of Anisakis occurrence in fishes in the NE Atlantic was built to define the thermal optimum and environmental ranges for salinity, depth, chlorophyll concentration, and diffuse attenuation. The temporal variability of anisakid infection in fishes in the last two decades indicated an increase in the NE Atlantic at an annual rate of 31.7 nematodes per total number of specimens examined per year. This rise in infection levels could be triggered by the increase in intermediate host fish stocks, especially hake in the area.
Issue Date: 2022
Publisher: SPRINGER
Type: Article
DOI: 10.1007/s00436-022-07446-2
ISSN: 0932-0113
E-ISSN: 1432-1955
Funder: Directorate of Fisheries and Aquaculture of the Basque Government (Department of Economic Development, Infrastructures and Environment -Vice Dept. of Agriculture, Fisheries and Food Policies) project ANIFEMP [00001-IRB2018-33]
European Union project (Urban Klima 2050) from the LIFE programme [LIFE 18 IPC 000001]
Appears in Publication types:Artículos científicos

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