Determination of the swim bladder parasite Anguillicola crassus (Nematoda, Dracunculoidea) in the European Eel, Anguilla anguilla (Linnaeus, 1758) from the locality Çamalti Tuzla of Izmir Bay, Eastern Aegean Sea (original) (raw)
Related papers
Turkish Journal of Fisheries and Aquatic Sciences, 2019
Despite the potential importance of parasitic nematode, Anguillicoloides crassus for the survival of eel, only a few studies have addressed this issue on eel stocks of Turkey. The current study reports baseline data on prevalence of parasites and pathological status in naturally infected eels from three important river estuaries (Seyhan River, Göksu River and Manavgat River) in Turkey. In total, 70 individuals of Anguilla anguilla from three river estuaries were examined and 46 (65.7%) specimens were infected by Anguillicoloides crassus. The nematodes were easily observed together with the excessive hemorrhagic exudate in the swimbladder. The swimbladder of eels were also pathologically examined. The uninfected swimbladder samples were grossly thin and shiny but in infected cases the tissues were detected as opaque, thick, hyperemic and mostly hemorrhagic. Histopathological examination revealed that focal to diffuse inflammation, marked hemorrhagies, erosive-ulcerative changes at the mucosa, edema and hyperemia at the submucosa. In severe cases muscularis mucosa were also affected.
Journal of Applied Ichthyology, 2009
A comprehensive literature review on prevalence and distribution of parasites of the European eel (Anguilla anguilla) in European waters was conducted to set a baseline for future trend analyses and biodiversity considerations. The resulting checklist compiled from peer reviewed journals as well as grey literature including scientific reports, conference contributions, PhD theses and own survey data includes all protozoan and metazoan parasites of the European eel from freshwater, brackish and marine habitats. Parasites are arranged according to phylum and family. Species within families are listed alphabetically. Infected host organs, recorded habitats, localities, countries and literature citations are provided for each species. A total of 161 parasite species ⁄ taxa from 30 countries are listed. With the trypanorhynch cestode Tentacularia coryphaenae a new host record could be documented. Furthermore, three new locality records of parasitic nematodes could be added based on own survey data: Anisakis simplex from an eel caught in the Baltic Sea, Eustrongylides mergorum for German freshwaters, and Goezia anguillae from the Tagus estuary in Portugal. Special consideration was given to the distribution of the swimbladder nematode Anguillcoloides (Anguillicola) crassus. A map and table of first reported records of this neozoan parasite species for 25 countries as well as a survey map indicating all published localities documented in the checklist are provided.
Biodiversity Data Journal, 2020
The present paper lists all parasite species of the European eelAnguilla anguilla(Linnaeus, 1758), recorded in Poland, in both its saltwater and freshwater habitats. The list has been drawn up, based on data acquired since 1844. The majority of included parasite species are presented with fish infection parameters together with data on their developmental stages and occupied microhabitats, localities and dates of collection of the eels themselves. The database includes 62 parasite taxa (including 50 species, nine identified to the genus level and three to higher taxa), representing at least 47 genera and 39 families. The most frequently-noted parasites of the European eel are the cestodeBothriocephalus claviceps, the nematodesAnguillicoloides crassus,Camallanus lacustrisandRaphidascaris acusand the acanthocephalanAcanthocephalus lucii. Four alien species have been noted from this host:A. crassus, the monogeneansPseudodactylogyrus anguillaeandPseudodactylogyrus biniand the acanthocep...
2020
The present paper lists all parasite species of the European eel Anguilla anguilla (Linnaeus, 1758), recorded in Poland, in both its saltwater and freshwater habitats. The list has been drawn up, based on data acquired since 1844. The majority of included parasite species are presented with fish infection parameters together with data on their developmental stages and occupied microhabitats, localities and dates of collection of the eels themselves. The database includes 62 parasite taxa (including 50 species, nine identified to the genus level and three to higher taxa), representing at least 47 genera and 39 families. The most frequently-noted parasites of the European eel are the cestode Bothriocephalus claviceps, the nematodes Anguillicoloides crassus, Camallanus lacustris and Raphidascaris acus and the acanthocephalan Acanthocephalus lucii. Four alien species have been noted from this host: A. crassus, the monogeneans Pseudodactylogyrus anguillae and Pseudodactylogyrus bini and the acanthocephalan Paratenuisentis ambiguus. The present list includes both new host records and earlier records not included in previous lists of parasites of eels.
Acta Biologica Turcica, 2017
In this study the infection status of swimbladder nematode Anguillicoloides crassus in European eel (Anguilla anguilla) was evaluated for the northeast Mediterranean Region of Turkey. 170 fresh European eel samples were obtained from the four different river side fish markets (whilst processing stage) as follows 45 from Goksu River (G), 42 from Seyhan River (S), 42 from Ceyhan River (C), and 41 from Asi River (A) in two times during a period of 3 years. The number of infected eels (Ni), prevalence (P%), parasite abundance (A), and mean intensity (MI) values were calculated according to the sampled period/locations. The prevalence, parasite abundance, and mean intensity values of parasites were higher Asi River than others.
Journal of Applied Ichthyology, 2010
Eel fishery in Estonian inland waters depends entirely on the stocking of glass eels or pre-grown (farmed) eels. Via importation of live eels of 20-30 cm length the non-indigenous swimbladder nematode Anguillicoloides crassus was probably introduced via Germany into Lake Vo˜rtsja¨rv in 1988, and has since spread to many inland waters of Estonia. In 1992, the parasite was found in eel caught from Lake Vo˜rtsja¨rv. Between 1992 and 2002 and additionally in 2008, we examined in total 870 eels from Lake Vo˜rtsja¨rv (270 km 2) and in 2008, 63 eels from three small lakes for adult A. crassus. The aim of the study was to obtain information on the variation of A. crassus infection in eels in Estonian lakes, to determine the temporal dynamics of prevalence and intensity of infection, and to establish a relationship between the length of host and intensity of infection in the eels in Lake Vo˜rtsja¨rv. There appeared to be a pronounced variation in prevalences of infected eels (from 3.7% to 100%) between the four investigated lakes. However, in Lake Vo˜rtsja¨rv, the prevalence of adult A. crassus infection remained stable (mean about 65%) for many years. The average number of nematode per infected eel (mean intensity) ranged from 12.6 ± 2.5 in 1993 to 4.0 ± 0.6 in 1999 in Lake Vo˜rtsja¨rv, while it was significantly higher (P < 0.0001) in the period 1992-1998 compared to 1999-2002 and 2008. The mean number of parasites per swimbladder was not related to eel length and no statistical difference was found in the condition factor of infected and non-infected eels. Although under normal environmental conditions A. crassus has not caused serious disease problems to eels in the study area, high intensity of parasite infection may contribute to eel kills due to oxygen deficiency in winter under the ice in Lake Vo˜rtsja¨rv.
Anguillicoloides crassus (Nematoda: Dracunculoidea) infection in eels in Moroccan estuaries
2018
This study assessed the prevalence and abundance of the invasive nematode Anguillicoloides crassus in 1138 wild European eel Anguilla anguilla sampled from two Moroccan estuaries between 2004 and 2009. Prevalence differed significantly between the two estuaries. The mean prevalence was 54% in Sebou and 34% in the Loukkos estuary. While the data suggested that the parasite is still spreading in Moroccan waters, there was a trend for stabilization or even decrease in prevalence values. The swimbladder degenerative index showed a significant positive relationship between the number of A. crassus and the damage observed in the infected organ. We discussed the possible mechanisms to explain the apparent stabilization in the infection levels.
Diseases of Aquatic Organisms, 1998
Amphibians (tadpoles of the frog Bombina bombina [L.] and the newt Triturus vulgaris [L.]) and aquatic insects (larvae of the alderfly Sialis lutaria [L.] [Megaloptera], dragonflies Sympetrum sanguineum [Miiller] and Coenagrion puella [L.] [Odonata], and the caddisfly Oligotrichia striati [L.] [Trichoptera]) were found to serve as paratenic hosts for the third-stage larvae (L,) of the nematode AnguiUjcola crassus Kuwahara, Niimi et Itagaki, 1974, a pathogenic swimbladder parasite of the eel Anguilla angudla (L.) in Europe and elsewhere. This is the first evidence that, in addition to prey fishes and some aquatic snails, amphibians and aquatic insects can serve as paratenic hosts for this nematode parasite. A. crassus third-stage larvae were found, largely unencapsulated (encapsulated only in S. lutaria), mostly in the body cavity, on the gut surface and, less often, in the liver and in the subcutaneous tissue of legs in amphibians, and in the body cavity and on the gut surface in insect larvae; they could survive for at least 49 d in T vulgaris and 69 d in S. lufaria. The capability of these larvae from S. lutaria (69 d post-infection) to infect the definitive host (eel) was confirmed by experimental infection of an eel.