| survey of protozoan, helminth and viral infections in shrimp litopenaeus setiferus and prawn macrobrachium acanthurus native to the jamapa river region, mexico. | we surveyed protozoan and metazoan parasites as well as white spot syndrome virus (wssv) and infectious hypodermal hematopoietic necrosis virus (ihhnv) in white shrimp litopenaeus setiferus and the palaemonid prawn macrobrachium acanthurus native to the lower jamapa river region of veracruz, mexico. the presence of parasites and the infection parameters were evaluated in 113 palaemonid prawns collected during the northwind (n = 45), rainy (n = 38) and dry seasons (n = 30) between october 2007 an ... | 2011 | 22013749 |