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<p>We describe for the first time the transmission route employed by the parasitic larvae of the freshwater mussel <italic>Anodontites trapesialis</italic> (Lamarck, 1819) during cohabitation on the guppy <italic>Poecilia reticulata</italic> Peter, 1859. The freshwater mussel and fish-host were employed as a model system to investigate the infection and parasite establishment. Laboratory experiments included video recording and histopathological analysis of the infection. <italic>In vivo</italic> video observations demonstrated that lasidium larvae could be transmitted to guppies during direct contact. A series of histology samples and photography suggest that this larva attaches and colonizes possibly on-site on the outer surface of the fish, causing cellular inflammation in the epidermis layer with cellular hyperplasia in the zone of parasite attachment. An evident hyaline layer, cellular hypertrophy, and a large number of undifferentiated proliferating cells were observed. Hemorrhagic tissue and swelling were observed in the epidermis and dermic zone. The total number of larvae per male and female guppy was 525 ± 86 and 494 ± 167, respectively. No parasitic preference was detected for male versus female parasitized fish.</p></abstract>

We describe for the first time the transmission route employed by the parasitic larvae of the freshwater mussel Anodontites trapesialis (Lamarck, 1819) during cohabitation on the guppy Poecilia reticulata Peter, 1859. The freshwater mussel and fish-host were employed as a model system to investigate the infection and parasite establishment. Laboratory experiments included video recording and histopathological analysis of the infection. In vivo video observations demonstrated that lasidium larvae could be transmitted to guppies during direct contact. A series of histology samples and photography suggest that this larva attaches and colonizes possibly on-site on the outer surface of the fish, causing cellular inflammation in the epidermis layer with cellular hyperplasia in the zone of parasite attachment. An evident hyaline layer, cellular hypertrophy, and a large number of undifferentiated proliferating cells were observed. Hemorrhagic tissue and swelling were observed in the epidermis and dermic zone. The total number of larvae per male and female guppy was 525 ± 86 and 494 ± 167, respectively. No parasitic preference was detected for male versus female parasitized fish.

Transmission route used by parasitic lasidium larvae of the freshwater mussel <italic>Anodontites trapesialis</italic> on guppies <italic>Poecilia reticulata</italic> during short cohabitation

Helminthologia

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Transmission route used by parasitic lasidium larvae of the freshwater mussel  on guppies  during short cohabitation

We describe for the first time the transmission route employed by the parasitic larvae of the freshwater mussel Anodontites trapesialis (Lamarck, 1819) during...

Transmission route used by parasitic lasidium larvae of the freshwater mussel Anodontites trapesialis on guppies Poecilia reticulata during short cohabitation

Article Category: Research Article

Published Online: May 04, 2022

Page range: 104 - 110

Received: Feb 15, 2021

Accepted: Mar 15, 2022

DOI: https://doi.org/10.2478/helm-2022-0009

Keywords
Freshwater, bivalve, environmental interaction, lasidium larvae, parasitism, histology

© 2022 M. I. Grano-Maldonado, I. B. Madureira, N. S. S. Trigueiro, N. V. Gonçalves, T. L. Rocha, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Transmission route used by parasitic lasidium larvae of the freshwater mussel Anodontites trapesialis on guppies Poecilia reticulata during short cohabitation

Article Category: Research Article

Published Online: May 04, 2022

Page range: 104 - 110

Received: Feb 15, 2021

Accepted: Mar 15, 2022

DOI: https://doi.org/10.2478/helm-2022-0009

KeywordsFreshwater, bivalve, environmental interaction, lasidium larvae, parasitism, histology

© 2022 M. I. Grano-Maldonado, I. B. Madureira, N. S. S. Trigueiro, N. V. Gonçalves, T. L. Rocha, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Keywords
Freshwater, bivalve, environmental interaction, lasidium larvae, parasitism, histology