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Occurrence of microsporidians Glugea hertwigi and Pleistophora ladogensis, in smelt Osmerus eperlanus from two German rivers, North Sea coast

2016; Inter-Research; Volume: 121; Issue: 1 Linguagem: Inglês

10.3354/dao03040

1616-1580

Graça Costa, Egberto Melo-Moreira, M. Carvalho,

Aquaculture disease management and microbiota

DAO Diseases of Aquatic Organisms Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials DAO 121:49-57 (2016) - DOI: https://doi.org/10.3354/dao03040 Occurrence of microsporidians Glugea hertwigi and Pleistophora ladogensis, in smelt Osmerus eperlanus from two German rivers, North Sea coast G. Costa1,2,*, E. Melo-Moreira1, M. A. Pinheiro de Carvalho2 1Estação de Biologia Marinha do Funchal, Promenade Orla Marítima do Funchal, 9000-107 Funchal, Madeira, Portugal 2ISOPlexis, Universidade da Madeira, Campus da Penteada, 9000-390 Funchal, Madeira, Portugal *Corresponding author: gcosta@uma.pt ABSTRACT: Monthly samples of smelt Osmerus eperlanus (Linnaeus, 1758) were collected from July 1985 to May 1986, in the river Elbe (Germany), and examined for infections with microsporidians. Two microsporidians were found: Glugea hertwigi Weissenberg, 1911, infecting the digestive tract and Pleistophora ladogenis Voronin, 1978, infecting the skeletal musculature. G. hertwigi infection led to the formation of xenomas, whereas P. ladogensis was characterized by diffuse infections, with the production of macroscopic visible thread-like or oval-shaped infection foci. Development of G. hertwigi in the host cells showed characteristics typical of the genus Glugea. The ultrastructural development of P. ladogensis showed features typical of the genus Pleistophora, without evidence of the production of 2 types of spores. Host reaction consisted of inflammatory tissue surrounding some of the infection foci as well as phagocytosis of spores. G. hertwigi was only found in juvenile smelt (<10 cm in length), whereas P. ladogensis infected smelts from 6 to 26 cm in length. Prevalence increased with fish length to a maximum value of 9.6%. Seasonal fluctuations in prevalence of infection were also found, with the lowest value in the winter months (2.5% in January 1986) and the highest in summer (11.8% in July 1985). The differences in prevalence of infection with fish length and date of sampling were significant. Additionally, samples of smelt caught in April 1986 from the rivers Eider and Ems revealed infections with P. ladogensis in the first river system only. KEY WORDS: Microsporidia · Glugea hertwigi · Pleistophora ladogensis · Smelt · Osmerus eperlanus Full text in pdf format PreviousNextCite this article as: Costa G, Melo-Moreira E, de Carvalho MAP (2016) Occurrence of microsporidians Glugea hertwigi and Pleistophora ladogensis, in smelt Osmerus eperlanus from two German rivers, North Sea coast. Dis Aquat Org 121:49-57. https://doi.org/10.3354/dao03040 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in DAO Vol. 121, No. 1. Online publication date: August 31, 2016 Print ISSN: 0177-5103; Online ISSN: 1616-1580 Copyright © 2016 Inter-Research.