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Probopyrus Buitendijki (Isopoda, Bopyridae), a Parasitic Isopod on Macrobrachium Rosenbergii in Timun River, Negeri Sembilan, Malaysia

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A bopyrid isopod was found attached in the gill chamber of a wild giant freshwater prawn, Macrobrachium rosenbergii (De Man, 1879) from the Timun River, Negeri Sembilan (Malaysia) (2°28′N 102°02′E), with a prevalence of 0.27% (2/743). The specimens measured 18.25±0.35 mm in length and 15.25±0.35 mm in width. The body of the isopod was subcordate and slightly distorted. It has five oostegites, with black pigment. The first oostegites are large, the 2nd and 3rd are suboval and smaller, while the 4th and 5th are long and ending in sharp points. Both specimens were identified as adult female Probopyrus buitendijki (Horst, 1910). The isopod was found only in January of 2009 and 2010, which months recorded a relatively low rainfall. A histopathological study of the infected gill showed impairment of the gill filaments, necrosis, and hyperplasia. Such effects may reduce the respiration efficiency of the gills.

Affiliations: 1: National Fish Health Research Centre, Fisheries Research Institute, 11960 Batu Maung, Penang, Malaysia; 2: National Fish Health Research Centre, Fisheries Research Institute, 11960 Batu Maung, Penang, Malaysia;, Email: kuabeng@fri.gov.my

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