[Preliminary results on a microsporidosis of Atherina boyeri Risso, 1810, from the Languedoc lagoons (author's transl)].

A most likely new microsporidia parasites Atherina boyeri Risso, 1810 and is found from the lagoons south of Montpellier to the Berre lagoon. This Protist establishes itself in the wall of the digestive tract, it forms numerous cysts, as well as in the general cavity of the fish were it evolves into voluminous xenoma (sometimes reatching centimeter in diameter) which present particular histological characteristics. This preliminary report extends from September 1976 to March 1977. The histological, epidemiological and statistical aspects are discussed. Experimental, biochemical and ultrastructural studies are under way.