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The presence of large pelagic fishes around the tip of the Baja peninsula is the base for an important sportfishing fleet in Cabo San Lucas, B.C.S. Among these species are: striped marlin (Kajikia audax), blue marlin (Makaira nigricans), black marlin (Makaira indica), sailfish (Istiophorus platypterus), swordfish (Xiphias gladius), mahi mahi (Coryphaena hippurus), wahoo (Acanthocybium solandri), yellowtail (Seriola lalandi), yellowfin tuna (Thunnus albacares), Mako shark (Isurus oxyrinchus) and others. Late 2010, from fishes catched by the sportfishing fleet we started a serie of observations on striped marlin and Mako shark due to they were clearly parasited. This is the first preliminar documented record of parasitic copepods of genus Alebion sp, in shortfin Mako shark (Isurus oxyrinchus), and Dinemoura sp, in striped marlin (Kajikia audax) in Cabo San Lucas area (23°N 110° 08’W). Both species fishes were captured by sportfishing fleet in October 2010 and January 2011. Copepods were extracted with a knife from the epithelium of several part of the body. The attachment location of the siphonostomatoid copepod in one Mako shark (seven specimens) was in the dorsal fin, and in four striped martins (fiftheen specimens) was in the ventral area close to the annus. The sea surface temperature was 29.4°C in October and 27.8°C in January. The areas for fishing activities are located in Golden Gate 23° 02´ lat. N 110° 15´long. W and Pozo de Cota 23° 02’ lat. N 110° 09’long. W, in the west coast of the Baja California peninsula. The range sizes for striped marlins were 190-210 cm and 240 cm for the Mako shark. The survey which we are involved in is focused to register the highest number of observations on sharks and marlin species, as well as other sport species in the area in order to increase the knowledge of parasites and to try to figure out why apparently parasites occur in just a few species.

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