Histological survey of symbionts and other conditions in razor clam Ensis arcuatus (Jeffreys, 1865) (Pharidae) of the coast of Galicia (NW Spain) |
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Authors: | Susana Darriba Maite Ruiz Carmen López |
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Institution: | a Instituto Tecnolóxico para o Control do Medio Mariño de Galicia (INTECMAR), Consellería do Mar. Peirao de Vilaxoán, s/n. Vilagarcía de Arousa, 36611 Galicia, Spain b Centro de Investigacións Mariñas (CIMA), Consellería do Mar. Pedras de Corón, s/n. Apdo. 13, Vilanova de Arousa, 36620 Galicia, Spain |
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Abstract: | Symbionts and abnormal conditions of razor clam Ensis arcuatus were surveyed in three commercially important natural beds of Galician estuaries (NW Spain). Samples of 15-20 E. arcuatus were collected every 2 months from January 2003 until July 2004 and processed for histological examination. Prokaryote-like colonies, renal coccidians, gregarines, Trichodina sp. ciliates, haplosporidian-like plasmodia, turbelaria, trematode metacercariae, cestode-like larvae and basophilic inclusion bodies were observed in razor clam tissues without causing host damage. Bucephalid digenean sporocysts and germinoma were seen in some samples causing moderate or severe damage to the host depending on the intensity of infection and both could be a cause for concern if prevalence reached epizootic levels in Galician E. arcuatus populations. None of the parasites detected is OIE notifiable and, in general, the commercially exploited beds studied seem to be devoid of serious pathogens. |
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Keywords: | Razor clam Ensis arcuatus Prokaryote-like colonies Coccidian Nematopsis sp Ciliates Haplosporidian-like Turbellarian Trematode Cestodes Copepods Germinoma Basophilic inclusion bodies |
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