Acta Parasitologica

, Volume 56, Issue 1, pp 20–33 | Cite as

Description of three new species of Gyrodactylus von Nordmann, 1832 (Monogenea) parasitising Oreochromis niloticus niloticus (L.) and O. mossambicus (Peters) (Cichlidae)

  • Adriana García-Vásquez
  • Haakon Hansen
  • Kevin W. Christison
  • James E. Bron
  • Andrew P. Shinn


Three new species of Gyrodactylus are described from two species of Oreochromis (Cichlidae): Gyrodactylus hildae sp. nov. from the Nile tilapia, Oreochromis niloticus niloticus, and from an unconfirmed cichlid in Ethiopia; Gyrodactylus ulinganisus sp. nov. from a South African population of Mozambique tilapia, Oreochromis mossambicus; and, Gyrodactylus yacatli sp. nov. from O. n. niloticus reared in Mexico. The hamuli and marginal hooks of G. hildae sp. nov. and G. yacatli sp. nov. differ notably from G. cichlidarum, a species commonly found on O. n. niloticus. The hooks of G. ulinganisus sp. nov., however, are morphologically similar to those of G. cichlidarum, but the two species were found to differ by 42 nucleotide substitutions (24 within the 342 bp long ITS1; 18 within the 303 bp long ITS2) and by 1 insertion/deletion. This study confirms that Nile and Mozambique tilapia harbour a number of different species of Gyrodactylus, with G. cichlidarum being the most frequently encountered and being associated with mortalities of juvenile O. n. niloticus. This study discusses the host specificity of gyrodactylids on commercial cichlid species and the potential repercussions of their movement on stocks of fish into new environments where cichlids are already present.


Monogenea Gyrodactylus G. hildae G. ulinganisus G. yacatli taxonomy cichlid tilapia Oreochromis n. niloticus O. mossambicus 


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Copyright information

© © Versita Warsaw and Springer-Verlag Wien 2011

Authors and Affiliations

  • Adriana García-Vásquez
    • 1
    • 4
  • Haakon Hansen
    • 2
  • Kevin W. Christison
    • 3
  • James E. Bron
    • 4
  • Andrew P. Shinn
    • 4
  1. 1.Centro de Investigación en Alimentación y DesarrolloCIAD, A.C. Unidad Mazatlán en Acuicultura y Manejo AmbientalMazatlán, SinaloaMexico
  2. 2.National Veterinary InstituteSection for ParasitologySentrum, OsloNorway
  3. 3.Department of Biodiversity and Conservation Biology (Zoology)University of the Western CapeBellvilleSouth Africa
  4. 4.Institute of AquacultureUniversity of StirlingStirlingUK

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