They are ubiquitous teleost ectoparasites that have been extensively studied since the late 19th Century, largely due their unique reproductive adaptations. Gyrodactylids are the only parasitic worms that reproduce in situ on their host and lack a specific transmission stage, therefore they bridge the classical divide between micro- bacteria, viruses etc and macroparasites worms etc. These viviparous parasites already contain a fully grown embryo the F1 in utero when born and as the parent ages, development of a third generation embryo the F2 is visible within the F1 see Fig. Many gyrodactylids exhibit distinct site preferences on the host, but may display characteristic migrations on the host during their life cycle. Gyrodactylids are small With increasing aquacultural practices, the threat posed by gyrodactylids is ever more apparent, particularly since the havoc created by the G.

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The paper deals with two morphologically similar but molecularly clearly different species of Gyrodactylus: G. The new species is described and its opisthaptoral hard parts compared to those of G.

Our molecular analysis of G. Limnonephrotus and within the G. The two species, however, did not cluster as sister taxa. The correspondence between molecular-based clades within G. Limnonephrotus and the morphological shapes of marginal hooks within these clades are discussed.

The importance of combined molecular and morphological analyses when describing or redescribing Gyrodactylus species is stressed. Gyrodactyloides bychowskii Monogenea: Gyrodactylidae from sea-caged Atlantic salmon Salmo salar in Scotland: occurrence and ribosomal RNA sequence analysis. Diseases of Aquatic Organisms, 45, — Salinity tolerance of Gyrodactylus derjavini from rainbow trout Oncorhynchus mykiss. Bulletin of the European Association of Fish Pathologists, 17, — Diagnosis and control of fish diseases.

A two days workshop and PhD course with a full day devoted to monogeneans, November 3 and 4, Gyrodactylus derjavini infections in four salmonids: comparative host susceptibility and site selection of parasites. Diseases of Aquatic Organisms, 28, — Parasite infections in Danish trout farms. Acta Veterinaria Scandinavica, 36, — Phylogenetic analysis of Gyrodactylus spp. Platyhelminthes, Monogenea using ribosomal DNA sequences. Canadian Journal of Zoology, 77, — Journal of Parasitology, 83, — Discrimination between Gyrodactylus salaris, G.

Parasitology, , 87— Journal of Fish Diseases, 18, — Systematic Parasitology, 48, — Gyrodactylus from Eurasian freshwater Salmonidae and Thymallidae. Folia Parasitologica, 30, 15— Order Gyrodactylidea Bychowsky, Nauka, Leningrad, — In Russian. Clupeiformes: Salmonidae. Folia Parasitologica, 39, — Zoologischer Anzeiger, , 56— Nucleic Acids Symposia, Ser. Combined ribosomal DNA and morphological analysis of individual gyrodactylid monogeneans.

Journal of Parasitology, 85, — New evidence that Gyrodactylus anguillae Monogenea is another invading pest of anguillid eels. Biological Invasions, 3, — Speciation and hostparasite relationships in the parasite genus Gyrodactylus Monogenea, Platyhelminthes infecting gobies of the genus Pomatoschistus Gobiidae, Teleostei. International Journal for Parasitology, 33, — Four new species of Gyrodactylus von Nordmann, Monogenea, Gyrodactylidae on gobiid fishes: combined DNA and morphological analyses.

Systematic Parasitology, 59, — Occurrence of Gyrodactylus Monogenea on salmon and rainbow trout in fish farms in Northern Finland. Bulletin of the Scandinavian Society for Parasitology, 5, 76— Taxonomical and ecological problems in Gyrodactylus. In: Parasitic worms and ecological conditions Eds. Ergens and B. Czech Academy of Sciences, Prague, — The excretory systems and the marginal hooks as a basis for the systematics of Gyrodactylus Trematoda, Monogenea. Gyrodactylus infestations on species of Salmo in Danish and Swedish hatcheries.

Norwegian Journal of Zoology, 21, — Gyrodactylus salaris Malmberg, and G. Salmonid transports, culturing and Gyrodactylus infections in Scandinavia. Gyrodactylidae and gyrodactylosis of Salmonidae. On the evolution within the family Gyrodactylidae Monogenea. International Journal for Parasitology, 28, — Gyrodactylus in salmon and rainbow trout farms.

In: Parasites and diseases in natural waters and aquaculture in Nordic Countries Eds. Stenmark and G. Zoo-Tax, Naturhistoriska Riksmuseets Reprocentral, — Species of Gyrodactylus Platyhelminthes, Monogenea on salmonids in Sweden. Fisheries Research, 17, 59— Molecular markers for gyrodactylids Gyrodactylidae: Monogenea from five fish families Teleostei.

International Journal for Parasitology, 31, — Fish parasites of the waterbasins of Azerbaijan. Hovedfagsoppgave i spesiell zoologi, parasitologi. Seasonal variations of the opisthaptoral hard parts of Gyrodactylus derjavini Mikailov, Monogenea: Gyrodactylidae on brown trout Salmo trutta L.

Systematic Parasitology, 26, — Seasonal occurrence of Gyrodactylus derjavini Monogenea on brown trout, Salmo trutta and Atlantic salmon, S. A special technique for studying haptoral sclerites of monogeneans.

Systematic Parasitology, 17, — Distribution and identification of gyrodactylid species in fish farms and rivers in Northern Ireland. Veterinary Record, , — Testing the model of DNA substitution. Bioinformatics, 14, — Fish monogenean of Poland. Two species of Gyrodactylus from Salmonidae. Acta Parasitologica Polonica, 36, — Distribution and characterization of species of Gyrodactylus Nordmann, Monogenea parasitizing salmonids in the U.

Journal of Natural History, 29, — Multivariate analyses of morphometrical features from Gyrodactylus spp. Monogenea parasitising British salmonids: Light microscope based studies. Systematic Parasitology, 33, — Sinauer Associates, Sunderland, Massachusetts. CLUSTAL W: improving the sensitivity of progressive multiple sequence alignment through sequence weighting, position-specific gap penalties and weight matrix choice.

Nucleic Acids Research, 22, — Parasitology, , 39— Speciation by host switch and adaptive radiation in a fish parasite genus Gyrodactylus Monogenea, Gyrodactylidae. Evolution, 56, — The crossroads of molecular, typological and biological species concepts: two new species of Gyrodactylus Nordmann, Monogenea: Gyrodactylidae. Systematic Parasitology, 55, 39— Comparison of molecular phylogeny and morphological systematics in fish parasite genus Gyrodactylus Nordmann, Monogenea, Gyrodactylidae.

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File:Gyrodactylus sp.jpg

We'd like to understand how you use our websites in order to improve them. Register your interest. Gyrodactylus jennyae n. Its morphology resembles most closely that of G.


We'd like to understand how you use our websites in order to improve them. Register your interest. Gyrodactylus longidactylus n. It is a species with rather small anchors which are only connected to a ventral bar which lacks a ventral bar membrane. The marginal hooks have long handles, which are always longer than the total length of the anchor. The pharynx has long pharyngeal processes. Measurements, drawings of the opisthaptoral hard parts, penis and pharynx, and SEM micrographs of this monogenean are presented.


Gyrodactylus salaris , commonly known as salmon fluke , [1] is a tiny monogenean ectoparasite which lives on the body surface of freshwater fish. The parasite is 0. When feeding, the parasite attaches its anterior end to the fish with cephalic glands. It everts its pharynx through the mouth and releases a digestive solution with proteolytic enzymes which dissolves the salmon skin.


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