Histopathological survey of the mussel Mytilus chilensis (Mytilidae) and the clam Gari solida (Psammobiidae) from southern Chile, South America

Florencia Cremonte, Claudia Puebla, Jorge Tillería, Viviana Videla


DOI: https://doi.org/10.3856/vol43-issue1-fulltext-21

Abstract


A total of 175 specimens of mussels Mytilus chilensis (Mytilidae) and 56 specimens of clams Gari solida (Psammobiidae) were collected in natural beds and culture sites of southern Chile (41° 23' S- 41° 42' S; 72° 17' W- 73° 50' W), Pacific Ocean. Juvenile mussel specimens (3 cm of maximum length) were free of parasites and diseases, whilst the commercial sized populations were parasitized by intracellular inclusions of bacteria-like organisms in the digestive gland epithelium and in the gills, by ciliates in the gills, turbellarians similar to Paravortex (Rhabocoela) in the intestine lumen and copepods attached to the gills. In addition, the hemocytic neoplasia disease was also present although in low prevalences. Therefore, the organ more affected in the mussels from all studied sites were the gills, which were swollen due to the presence to the anaplasic haemocytes, infected with intracellular inclusions of bacteria-like organisms, parasitized by ciliates, and their structure was seriously altered when copepods were found attached. In the clam G. solida, bacteria-like organisms were found in the epithelium digestive gland and in the gills, often encapsulated by haemocytes; oocysts containing up to 8 sporozoites similar to Nematopsis (Apicomplexa) in the connective tissue, causing haemocytic infiltration when the intensity of infection was high; ciliates belonging to 2 different species (one of them similar to Trichodina) mainly inhabiting the gills; and a turbellarian similar to Paravortex in the lumen of digestive system without apparent host reaction

Cremonte F, Puebla C, Tillería J, Videla V. Histopathological survey of the mussel Mytilus chilensis (Mytilidae) and the clam Gari solida (Psammobiidae) from southern Chile, South America. Lat. Am. J. Aquat. Res.. 2016;43(1). Available from: doi:10.3856/vol43-issue1-fulltext-21 [Accessed 22 Jan. 2019].
Cremonte, F., Puebla, C., Tillería, J., & Videla, V. (2016). Histopathological survey of the mussel Mytilus chilensis (Mytilidae) and the clam Gari solida (Psammobiidae) from southern Chile, South America. Latin American Journal of Aquatic Research, 43(1). doi:http://dx.doi.org/10.3856/vol43-issue1-fulltext-21