Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Massive mortality in Manila clams (Ruditapes philippinarum) farmed in the Lagoon of Venice, caused by Perkinsus olseni.

Abstract

Perkinsosis is a category of mollusc diseases caused by protozoan parasites belonging to the genus Perkinsus. Heavy infection with Perkinsus olseni often results in tissue inflammation, reduced growth and impaired reproduction. The lagoons of the Veneto Region, Italian leading producer of Manila clams, to date have never experienced events of mass mortality related to P. olseni, since the first detection of the pathogen in 1991. Our study describes a severe mortality in Manila clam in the autumn of 2011 in the southern part of the Lagoon of Venice, where extensive lesions caused by P. olseni were observed.