Epidemiology and pathology of Anguillicoloides crassus in European eel Anguilla anguilla from the Tagus estuary (Portugal)

Neto, Ana; Costa, José Lino; Costa, María José; Domingos, Isabel

doi:10.3354/dao02166

Cited by 22 publications

(18 citation statements)

References 40 publications

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“…higher harbouring capacity) and potentially different feeding habits compared with smaller A . anguilla (Lefebvre et al , ; Neto et al , ). Further analyses would be required to study the effect of these factors on the infection levels of A .…”

Section: Discussionmentioning

confidence: 99%

Distribution, prevalence and intensity of Anguillicola crassus (Nematoda) infection in Anguilla anguilla in the Republic of Ireland

Becerra-Jurado

Cruikshanks

O’Leary

et al. 2014

Journal of Fish Biology

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This study is the first comprehensive documentation of the geographical range of Anguillicola crassus in its host, the European eel Anguilla anguilla, in the Republic of Ireland. The prevalence and intensity of infections across 234 sites and 93 river basins in Ireland comprising rivers, lakes and transitional waters (estuaries) were analysed. While only 32% of the river basins were affected by this nematode, they correspond to 74% of the total wetted area. Significant differences in infection levels among water body types were found with lakes and transitional waters yielding the highest values, which can be attributed to the proportions of juvenile (total length, L(T) < 300 mm) A. anguilla caught. There were no significant differences in infection levels between water body types for adult A. anguilla or between sexes for any water body type. Prevalence was significantly lower in juvenile compared with adult A. anguilla captured in rivers and a positive correlation between infection levels and host size-classes was found. Future efforts should focus on monitoring the spread of A. crassus infections and assessing the swimbladder health of A. anguilla in Ireland.

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Section: Discussionmentioning

confidence: 99%

Distribution, prevalence and intensity of Anguillicola crassus (Nematoda) infection in Anguilla anguilla in the Republic of Ireland

Becerra-Jurado

Cruikshanks

O’Leary

et al. 2014

Journal of Fish Biology

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“…As the swimbladder nematode A. crassus may severely injure the swimbladder and possibly affect the vertical migration of A. anguilla (Van Banning & Haenen, 1990; Würtz & Taraschewski, 2000; Abdelmonem et al , 2010; Neto et al , 2010), it may be argued that the observed behaviour with fast vertical movements up and down the water column may be a result of A. anguilla not being able to keep a steady depth possibly due to being infected by this parasite. It was therefore important to document that this study represents parasite‐free individuals.…”

Section: Discussionmentioning

confidence: 99%

“…Another factor that may influence the behaviour of A. anguilla is the introduced swimbladder nematode Anguillicoloides crassus . This parasite may cause severe pathology and dysfunction of the swimbladder (Van Banning & Haenen, 1990; Würtz & Taraschewski, 2000; Abdelmonem et al , 2010; Neto et al , 2010). In laboratory experiments, A. crassus ‐infected A. anguilla has shown severely impaired swimming performance (Palstra et al , 2007) and Sjöberg et al (2009) suggested that the parasite‐induced damage to the swimbladder may inhibit vertical migrations and cause infected fish to migrate in shallower coastal waters, closer to the shore.…”

Section: Introductionmentioning

confidence: 99%

Early marine migration of European silver eel Anguilla anguilla in northern Norway

Davidsen

Finstad

Økland

et al. 2011

Journal of Fish Biology

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25To study migratory behaviour in wild northern European silver eel (Anguilla anguilla) during 26 sea entry and early marine migration, 32 individuals were tagged with acoustic transmitters 27 and registered at four automatic listening station arrays from the mouth of the north 28Norwegian River Alta and throughout the Alta Fjord. The A. anguilla entered the fjord during 29 all parts of the tidal cycle and did not seem to utilize the outgoing tidal currents. They 30 migrated mainly during the night, both in the river mouth and fjord. On average, they spent 31 2.7 days travelling from the river mouth to the outermost array, 31 km from the river mouth, 32 corresponding to anaverage migratory speed of 0.

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“…In contrast, both our study and that of Moser et al (2001) in SC showed no seasonal patterns of infection by adult stages. Similarly, Neto et al (2010) found dampened seasonality in A. crassus prevalence in low latitude (Portuguese) populations of European eel. In particular, the mild winter temperatures may have numerous consequences on the parasite life cycle, including continual development, increased survival of larvae, or increased reproductive success of adults (Knopf et al 1998).…”

Section: Discussionmentioning

confidence: 99%

Invasive swimbladder parasite Anguillicoloides crassus: infection status 15 years after discovery in wild populations of American eel Anguilla rostrata

Hein

Arnott²,

Roumillat³

et al. 2014

Dis. Aquat. Org.

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A year-round survey of American eels Anguilla rostrata was performed at 5 localities in South Carolina (SC), USA, 15 yr after the first infection by the nematode Anguillicoloides crassus was reported from Winyah Bay, SC. Infections by adult stages of A. crassus in the swimbladder lumen occurred with a prevalence of 45% (n = 479), a mean intensity (± SE) of 2.3 ± 0.2 worms per infected eel (range = 1−22), and a mean abundance of 2.0 ± 0.1 among all eels. Infections by larval stages of A. crassus in the swimbladder wall occurred with a prevalence, intensity, and abundance of 29%, 2.4 ± 0.3 (range = 1−15), and 0.7 ± 0.1, respectively (n = 471). Overall prevalence of the parasite (any stage) was 58%, with a mean intensity ± SE of 3.0 ± 0.2 and a mean abundance of 1.8 ± 0.2. Biomass of the adult parasite stage varied significantly with eel body length, but the direction of the effect depended on salinity. Prevalence and intensity of infection by adult nematodes varied by locality but not by eel total length, salinity, or season. Larval prevalence was significantly greater in the winter and spring and also differed among localities. The lack of seasonal effects on infection by the adult worm stage contrasts with studies from higher latitudes in North America and Europe and may be due to the warmer winter temperatures at southern latitudes. Significant variation in infection among localities reflects possible differences in abundance of intermediate and/or paratenic hosts. Overall, infection levels were higher than previous reports for eels in SC but comparable to more recent reports from other areas in North America.

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Epidemiology and pathology of Anguillicoloides crassus in European eel Anguilla anguilla from the Tagus estuary (Portugal)

Cited by 22 publications

References 40 publications

Distribution, prevalence and intensity of Anguillicola crassus (Nematoda) infection in Anguilla anguilla in the Republic of Ireland

Distribution, prevalence and intensity of Anguillicola crassus (Nematoda) infection in Anguilla anguilla in the Republic of Ireland

Early marine migration of European silver eel Anguilla anguilla in northern Norway

Invasive swimbladder parasite Anguillicoloides crassus: infection status 15 years after discovery in wild populations of American eel Anguilla rostrata

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