New data on the biology of the introduced exotic nematode <i>Anguillicola crassus</i> Kuwahara, Niimi et Itagaki, 1974 in the eel <i>Anguilla anguilla</i> in Lake Wdzydze (Polish waters)

Rolbiecki, Leszek

doi:10.2478/v10009-008-0006-0

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…The high infection numbers of the eel from Lake Łebsko confirms the results of the study by Morozińska-Gogol (2005). According to various authors (Palikowa and Navratil 2001, Kangur et al 2002, Pilecka-Rapacz and Sobecka 2004, Rolbiecki 2008, the maximum number of specimens in the lumen of eel swimbladders can range from 1 to as many as 92 individuals. In these studies, the occurrence of more than twenty A. crassus individuals was noted in the swimbladders of only a small number of the eels examined.…”

Section: Discussionmentioning

confidence: 99%

Infection of European eel, Anguilla anguilla (L.), with the nematode Anguillicoloides crassus (Kuwahara, Niimi et Itagaki, 1974) in Polish waters

Popielarczyk

Robak²,

Siwicki³

2012

Polish Journal of Veterinary Sciences

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The aim of this study was to determine the degree of Anguillicoloides crassus infection in European eel inhabiting Polish waters based on selected parasitic descriptors and on anatomical pathology of the swimbladder using macroscopic methods. In all, 154 European eel specimens were sampled from eleven sites in Poland and A. crassus was present in the swimbladder of 114 fish. The intensity of A. crassus infection in all the eel specimens ranged from 1 to 62 parasites at a mean value of 7.5. High values of mean infection intensity were noted in samples from Pomeranian lakes Bukowo, Łebsko, and Jamno. The health of the swimbladder was evaluated using the swimbladder degenerative index (SDI). The mean value of the SDI for all of the eel examined was 3.3, and extensively degenerated swimbladders were observed mainly in samples in the Szczecin Lagoon and from lakes. According to the individual SDI ratings, 9.1% of the eel specimens did not exhibit pathological symptoms of the swimbladder (SDI-0) and an extremely damaged (SDI-6) swimbladder was noted in 11.7% of the fish examined. In the case of eel infected with A. crassus, higher SDI values were reflected in initially increasing shares in subsequent categories. In fish that were not infected with the nematode, only 20% (8 individuals) of the swimbladders showed no symptoms of pathology (SDI-0).

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Section: Discussionmentioning

confidence: 99%

Infection of European eel, Anguilla anguilla (L.), with the nematode Anguillicoloides crassus (Kuwahara, Niimi et Itagaki, 1974) in Polish waters

Popielarczyk

Robak²,

Siwicki³

2012

Polish Journal of Veterinary Sciences

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“…Briefly, the swimbladder was incubated (1 h/40°C) in soft agitation, with a 1.5% (weight/volume) pepsin solution and 1.5% (weight/volume) hydrochloric acid in distilled water. The resulting homogenate was centrifuged at 800 g for 5 min, and larvae present in the sediment were counted under the microscope using Favatti counting chambers for L3 and L4 stages (Rolbiecki, 2008) and graduated glass slides for L2 (which in most cases appeared free as a result of the digestion of the egg shells which contained each one larva).…”

Section: Methodsmentioning

confidence: 99%

Monitoring for Anguillicoloides crassus, Anguillid herpesvirus 1, aquabirnavirus EVE and rhabdovirus EVEX in the European eel population of southern Spain

Ybáñez

Rı́o

Flores‐Flores

et al. 2023

Journal of Fish Diseases

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Over the last decades, native European eel (Anguilla anguilla L.) stocks have declined sharply in the European Union. The ICES/EIFAC Working Group on Eels determined in October 2002 (ICES, 2003) that the stock was outside safe biological limits, and, thus, A. anguilla was considered critically endangered. The causes of the decline are not completely elucidated but most authors agree that they should

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“…So on that account, as suggested by Laetsch et al (2012), the present study refers to the two species A. crassus and A. novaezelandiae as members of the genus Anguillicola. For distinguishing the different species on a morphological basis, there are several studies describing anatomical features and detail measurements of body characteristics of adult (Taraschewski et al 1987; Moravec and Taraschewski 1988;Moravec and Rohde 1992;Lefebvre et al 2004;Münderle 2005;Moravec 2006;Münderle et al 2006;Brunanska et al 2007Brunanska et al , 2010Rolbiecki 2008) and larval anguillicoloid species (Blanc et al 1992) taken from wild eel populations and from experimentally infected eels (Moravec et al 1994a). In order to analyse potential evolutionary divergence, one study has focused on measuring nematode populations of one species from different sites in the world in two experimentally infected eel species (Weclawski et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Size does matter—a closer look on Anguillicola morphology

2015

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The present study deals with morphological differences between two closely related parasitic nematode species (Anguillicola crassus Kuwahara et al., 1974 and Anguillicola novaezelandiae Moravec & Taraschewski, 1988) in two different experimentally infected eel species (Anguilla anguilla Linnaeus, 1758 and Anguilla japonica Temminck & Schlegel, 1847). Furthermore, it considers the question whether size differences between those two species are ontogenetically determined or host species-dependent. In order to analyse these questions, experimental infections with the four possible host-parasite systems have been performed, followed by precise morphometric measurements related to body size and head structures of all resulting nematodes 120 days post infection. Body size measurements (length and width) of A. crassus generally exceeded those of A. novaezelandiae, while both Anguillicola species turned out to be smaller in Japanese eels than in European eels. Comparative measurements of neck width, maximum oesophagus width, and posterior head end width were found to be highly significant with regard to the different host-parasite systems. Shape and width of neck have been identified as reliable discriminating factors for species distinction. Generally, the relation of anterior head end width and neck width proved to be distinctly species-specific and can thus serve as a decisive and easily measureable distinguishing feature.

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New data on the biology of the introduced exotic nematode Anguillicola crassus Kuwahara, Niimi et Itagaki, 1974 in the eel Anguilla anguilla in Lake Wdzydze (Polish waters)

Cited by 7 publications

References 21 publications

Infection of European eel, Anguilla anguilla (L.), with the nematode Anguillicoloides crassus (Kuwahara, Niimi et Itagaki, 1974) in Polish waters

Infection of European eel, Anguilla anguilla (L.), with the nematode Anguillicoloides crassus (Kuwahara, Niimi et Itagaki, 1974) in Polish waters

Monitoring for Anguillicoloides crassus, Anguillid herpesvirus 1, aquabirnavirus EVE and rhabdovirus EVEX in the European eel population of southern Spain

Size does matter—a closer look on Anguillicola morphology

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