Journal
VETERINARY PARASITOLOGY
Volume 180, Issue 3-4, Pages 323-331Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.vetpar.2011.03.004
Keywords
Gyrodactylus anguillae; Monogenea; Anguilla anguilla; Glass eel; Mortality; Parasite; Spain
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Funding
- Department of the Environment, Food and Rural Affairs (Defra), UK [FC1175]
- Overseas Research Students Awards Scheme (ORSAS), UK
- Consejo Nacional Ciencia y Tecnologia, Mexico (CONACYT) [171032]
- Scottish International Education Trust (SIET)
- Generalitat de Cataluna (Departament d'Agricultura, Alimentacio i Accio Rural)
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The association of Gyrodactylus anguillae Ergens, 1960 with the glass eel stage of Anguilla anguilla (L.) (total body length 61.4 +/- 4.9 mm; range 55-70) is reported from the northwestern Mediterranean coast of Spain for the first time. A sample of 12,600 glass eels, caught by professional fishermen operating in the mouth of the rivers Fluvia, La Muga and Ter (north-east Spain), was subject to mortalities of similar to 1.75% of stock/day following transfer to a research facility. Subsequent losses over a 31-day period amounted to 56% of the initial stocked biomass. Although the moderate burdens of G. anguillae/host (20.2 +/- 6; range 11-32) were the primary reason for a subsequent treatment, a simultaneous infection with Trichodina jadranica Raabe, 1958, Trichodina anguillae Wu, 1961 and Ichthyophthirius multi:finis Fouquet, 1876, makes it impossible to attribute the high mortality of glass eels in this case to a single pathogen. A histopathological examination of the gills of moribund fish showed them to be swollen, hyperplastic and necrotic. This study also redescribes G. anguillae, providing for the first time a full 27 character morphometric description of the attachment hooks, and importantly, a photographic record of the armature of the haptor and the male copulatory organ. (C) 2011 Elsevier B.V. All rights reserved.
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