Ectoparasites of the genus Neobenedenia Yamaguti, 1963, are responsible for causing mortality within aquaculture systems. Given their pronounced morphological resemblance, the identification of Neobenedenia species based on phenotypic characteristics poses significant challenges. Thus, molecular techniques are used to complement discrimination between species with very limited morphological variation, such as Neobenedenia melleni (MacCallum, 1927) Yamaguti 1963 and N. girellae (Hargis, 1955) Yamaguti, 1963. Molecular markers can enhance the ability to describe biological diversity and understand the biogeography of these species.  The gulf of California has traditionally hindered the exchange of genes for various species with different life histories. In this study, Neobenedenia specimens were collected from wild and captive Seriola rivoliana Valenciennes, 1833, at four locations wi...

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 mounte...