Abstract

CESPEDES, Roxana Esther; IANNACONE, José  and  SALAS, Alberto. Parasite helminths of jumbo squid Dosidicus gigas eviscerate in Arequipa, Peru. Ecol. apl. [online]. 2011, vol.10, n.1, pp.1-11. ISSN 1726-2216.

The giant squid or squid Dosidicus gigas (D'Orbigny 1835) has been included in the list of most important species in pelagic marine ecosystems. Parasitic helminthes fauna with emphasis on those of zoonotic and sanitary importance was assessed from 254 fresh and eviscerated individuals (D. gigas) caught in oceanic waters of the Pacific Ocean, south of Peru, and landed in Puerto Lomas, Arequipa (15 ° 26 'S to 75 ° 03' L) during the year 2009. Dorsal Length (MDL) in cm. and Weight of Standard Mantle (MSW) in kg. was determined in each squid. Five different helminthes larval taxa were found: Didimozoidea unidentified sp. (mean abundance of infection (MA): 0.0039; Prevalence: 0.39%), two larval cestodes: Hepatoxylon trichiuri (Holten 1802) (MA: 0.04, prevalence: 0.78%) and Tentacularia coryphaenae (Bosc 1797) (MA: 1.68, Prevalence: 56.29%), and two nematodes Anisakis simplex or type I (Dujardin 1845) (MA: 0.23; Prevalence: 15.74%), A. physeteris or Type II (Baylis 1923) (MA: 1.11, Prevalence: 50%). 57% of squid (D. gigas) were infested by the zoonotic nematode Anisakis. The three parasites with higher specific importance were: T. coryphaenae, A. physeteris and A. simplex. A linear relationship with the MDL of the host and the average prevalence of T. coryphaenae was found. A linear relationship with the MSW and the mean prevalence of A. simplex was found. Nonparametric estimators indicated that an increase in the collection effort was needed and indicated that there should be up to six helminth species in D. gigas. Comparison of MDL between parasitized and non-parasitized squids by A. simplex, A. physeteris, T. coryphaenae showed no significant differences. Finally, a comparative quantitative analysis of the components of the parasitic fauna of D. gigas between years 1981-1989, 2003-2004, 2008-2009 and 2009 was performed.

Keywords : Anisakis; Hepatoxylon; Tentacularia.

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