METACERCARIAE OF HEMIURID IN COPEPODS FROM THE ENSENADA DE LA PAZ, BAJA CALIFORNIA SUR, MEXICO

• Autores: Gómez del Prado- Rosas, María del Carmen, Valles-Vega, Isabel, Lozano-Cobo, Horacio, Hernández-Trujillo, Sergio
• Formato: artículo
• Fecha de Publicación: 2011
• Institución: Universidad Nacional Federico Villarreal
• Repositorio: Revistas - Universidad Nacional Federico Villarreal
• Lenguaje: español
• OAI Identifier: oai:ojs2.revistas.unfv.edu.pe:article/1063
• Enlace del recurso: https://revistas.unfv.edu.pe/NH/article/view/1063
• Nivel de acceso: acceso abierto
• Materia: Baja California sur; Calanoids copepodsr; Ensenada de La Pazr; hemiurids, metacercariae; Mexico; Copépodos calanoides; Ensenada de La Paz; Hemiúridos; metacercarias; México

In the Bay and Ensenada de La Paz there is a strong variability in the composition and abundance ofpelagic copepod species but there is no information on parasitic infection level. The early stages oftrematode is unclear because they use jellyfish, ctenophores, molluscs, chaetognaths, copepods and fish larvae as first and second intermediate hosts.The aim of this work was to study the parasitic helminths in calanoid copepods in the Ensenada de la Paz, Baja California Sur, Mexico. Zooplankton was obtainedwith a conical net of 1.5 m in length, mesh size of 300 microns and a digital flowmeter. Net tows weremade in sea surface for 5 min at 0,2 knots/h at a fixed station sampling during the last week of June 2008.Samples were fixed in formalin 4%. Copepods with parasites were sorted and identified. The extractedworms were stained with Gomori Trichome, cleared with methyl salicylate and mounted in permanentpreparations with synthetic resin. Prevalence (P) and average intensity of infection (I) were calculated.Adult females of calanoid copepod Acartia lilljeborgii Giesbrecht, 1889 had a density field of 14 100orgs/55 m3 and only fifteen had not encysted metacercariae of hemiurids in the hemocoeloma (P =0.106%). The hemiurids identified were: Brachyphallus sp. (n = 5, P = 0.035%, I = 1), Dinosoma sp. (n =2, P = 0.014%, I = 1), Hemiurus sp. (n = 1, P = 0.014%, I = 1) and Parahemiurus sp. (n = 2, P = 0.021%, I= 1). The possible role of copepods as intermediate or paratenic hosts in the life cycle of helminths isdiscussed. This is the first record of parasitism in marine pelagic crustaceans calanoid by digeneans inMexico.