Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/10236
Appears in Collections:Aquaculture Journal Articles
Title: A revised description of Gyrodactylus cichlidarum Paperna, 1968 (Gyrodactylidae) from the Nile tilapia, Oreochromis niloticus niloticus (Cichlidae), and its synonymy with G. niloticus Cone, Arthur et Bondad-Reantaso, 1995
Authors: Garcia-Vasquez, Adriana
Hansen, Haakon
Shinn, Andrew
Contact Email: a.p.shinn@stir.ac.uk
Keywords: 1832 MONOGENEA
analysis
AQUACULTURE
cichlid
description
fish
Gyrodactylus cichlidarum
Health
HOST
HOSTS
identification
identities
Identity
IMAGE
Measurement
morphology
MORTALITIES
MORTALITY
Nile tilapia
OPISTHAPTORAL HARD PARTS
Oreochromis niloticus
other
parasite
PHYLOGENETIC ANALYSIS
PLACE
PLATYHELMINTHES
RDNA
REGION
SALARIS
salmonids
Scotland
SEQUENCE
STOCKS
SUBGENERA
SYSTEM
taxonomy
TELEOSTEI
TILAPIA
UK
welfare
Issue Date: 2007
Publisher: Institute of Parasitology, Biology Centre AS CR, Czech Republic
Citation: Garcia-Vasquez A, Hansen H & Shinn A (2007) A revised description of Gyrodactylus cichlidarum Paperna, 1968 (Gyrodactylidae) from the Nile tilapia, Oreochromis niloticus niloticus (Cichlidae), and its synonymy with G. niloticus Cone, Arthur et Bondad-Reantaso, 1995, Folia Parasitologica, 54 (2), pp. 129-140.
Abstract: A recent infestation of Gyrodactylus cichlidarum Paperna, 1968 on yolk sac fry of Nile tilapia, Oreochromis niloticus niloticus (L.), in an isolated aquarium system in the UK resulted in high mortalities and provided an opportunity to study this species in greater detail. A tentative identification was made using the measurements and drawings of the ventral bar and hamuli provided in the original description; however, details on the morphology of the marginal hooks were lacking. A comparison of the gyrodactylid material collected from O. n. niloticus with the holotype of G. cichlidarum, the only known available specimen, from Mango tilapia, Sarotherodon galilaeus galilaeus (L.), confirmed its identity. Proteolytic digestion and image analysis of he opisthaptoral hard parts were used to obtain tissue-free, accurate measurements as part of a complete revised. description of G. cichlidarum. Further, a comparison of G. cichlidarum from both hosts with the holotype and several paratypes of Gyrodactylus niloticus Cone, Arthur et Bondad-Reantaso, 1995 cited as parasitizing captive stocks of Nile tilapia in the Philippines revealed the two species to be synonymous. An 803 bp fragment of the ribosomal internal transcribed spacers I and 2 and the 5.8S was obtained and is provided with the revised description. This is the first DNA sequence from a Gyrodactylus species originating from the African continent. The sequence is very divergent from other species in the genus and only the 5.8S sequence places it unambiguously in the genus Gyrodactylus. In addition to G. cichlidarum, two specimens of another morphological similar species of Gyrodactylus were also found on the UK held stock of O. n. niloticus. These latter specimens, Gyrodactylus sp., differed from G. cichlidarum in having a longer hamulus point with a smaller hamulus aperture and possessing marginal hook sickles that had a shorter shaft with a longer point giving the sickles a more rounded, closed appearance
Type: Journal Article
URI: http://hdl.handle.net/1893/10236
URL: http://folia.paru.cas.cz/detail.php?id=20841
Rights: Publisher allows this work to be made available in this repository. Published in Folia Parasitologica, 54.2, pp.129-140, 2007, by Institute of Parasitology, Czech Republic. http://folia.paru.cas.cz/detail.php?id=20841
Affiliation: University of Stirling
National Veterinary Institute, Oslo
Aquaculture

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