title: Epizootiology of Perkinsus marinus, parasite of the pleasure oyster Crassostrea corteziensis, in the Pacific coast of Mexico.
abstract: The protozoan parasite Perkinsus marinus is the etiological agent of "dermo disease". This pathogen is considered by the World Organization for Animal Health (OIE) as reportable due to the high mortalities that it produces in the eastern oyster Crassostrea virginica in the US. In 2006, this parasite was detected in the pleasure oyster Crassostrea corteziensis in Nayarit on the Pacific coast of Mexico, indicating a new host and an extension of its known distribution. Epizootiological data of P. marinus in the pleasure oyster are unknown. With the objective of determining the prevalence and intensity in relation with temperature and salinity throughout time, as well as for studying interactions of host size and sex with the parasite, a monthly sampling was carried out in two aquaculture sites of Nayarit from 2007 to 2014. A total of 7700 oysters were analyzed. In both localities, prevalence was low in winter (<6%) when temperature and salinity fluctuated around 24°C and 33, respectively; and the highest prevalence values occurred during summer (37%) when temperature and salinity were around 30°C and 20, respectively. Infection intensity increased in summer, but severe cases remained on average <10%. Larger oysters showed the highest prevalence and intensity, and higher prevalence were generally observed in females. No unusual mortalities directly related with P. marinus were observed.
authors.affiliation: Centro de Investigación Científica y Educación Superior de Ensenada (CICESE), Carretera Ensenada-Tijuana No. 3918, Zona Playitas, 22860 Ensenada, Baja California, Mexico; Instituto de Sanidad Acuícola A.C. (ISA), Calle de la Marina S/N, esq. Caracoles, Fracc. Playa Ensenada, 22880 Ensenada, Baja California, Mexico. Electronic address: jcaceres@cicese.mx.
authors.forename: Jorge
authors.initials: J
authors.lastname: Cáceres-Martínez
authors.affiliation: Centro de Investigación Científica y Educación Superior de Ensenada (CICESE), Carretera Ensenada-Tijuana No. 3918, Zona Playitas, 22860 Ensenada, Baja California, Mexico.
authors.forename: Luis Humberto
authors.initials: LH
authors.lastname: Madero-López
authors.affiliation: Comité Estatal de Sanidad Acuícola del Estado de Nayarit, CESANAY, Rubí # 22, Col. Valle de Matatipac, 63195 Tepic, Nayarit, Mexico.
authors.forename: Gloria
authors.initials: G
authors.lastname: Padilla-Lardizábal
authors.affiliation: Instituto de Sanidad Acuícola A.C. (ISA), Calle de la Marina S/N, esq. Caracoles, Fracc. Playa Ensenada, 22880 Ensenada, Baja California, Mexico.
authors.forename: Rebeca
authors.initials: R
authors.lastname: Vásquez-Yeomans
mesh_terms: D000818:Animals; D016782:Apicomplexa; D049896:Crassostrea / Q000469:parasitology*; D005260:Female; D006790:Host-Parasite Interactions; D008297:Male; D008800:Mexico; D015995:Prevalence; D012621:Seasons; D013696:Temperature
keywords: Dermo disease; Oyster culture; Oyster disease; Perkinsosis