Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 9062
Title: Morphological and molecular characterisation of Aporocotyle margolisi Smith, 1967 (Digenea: Aporocotylidae) from the North Pacific hake Merluccius productus (Ayres) (Gadiformes: Merlucciidae) off Oregon
Author: J. S. Hernandez-Ortz, D. I. Hernandez-Mena, G. Alama-Bermejo, R. Kutcha, K. C. Jacobson
Publication Year: 2017
Journal: Systematic Parasitology
Keywords: Pacific hake,parasites,

Abstract  Aporocotylid blood flukes conspecific to Aporocotyle margolisi Smith, 1967 were collected from the bulbus arteriosus of the North Pacific hake Merluccius productus (Ayres). This study revisits the morphology of A. margolisi, including drawings, measurements and scanning electron microscopy images, and provides for the first time molecular data for the large subunit of the ribosomal RNA (28S rDNA) and cytochrome oxidase subunit I mitochondrial (cox1) genes for this species. A 28S rDNA phylogenetic study of A. margolisi and all available Aporocotyle spp. was also performed. The distribution range of A. margolisi is extended to the Pacific coast of the United States. We provide a morphological comparison of Aporocotyle spp. from the northeast Pacific coast in North America as well as to other Aporocotyle spp. infecting hake. Our new specimens of A. margolisi were found to be considerable larger on all morphological traits to the original description, except for shorter spines. Molecular results showed a close relationship of A. margolisi and A. argentinensis Smith, 1969 from Argentine hake Merluccius hubbsi Marini. The phylogenetic relationships of Aporocotyle spp. points to a possible co-speciation of hakes host species and these blood flukes parasites.


A morphological and molecular characterisation of a blood fluke from Pacific hake collected off Oregon in 2016.

Theme: Ecosystem approach to improve management of marine resources
Foci: Characterize ecological interactions (e.g. predation, competition, parasitism, disease, etc.) within and among species.