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Elthusa alvaradoensis Rocha-Ramírez, Chávez-López & Bruce, 2005 (Isopoda, Cymothoidae) parasitizing the inshore lizardfish, Synodus foetens (Linnaeus, 1766) on the continental shelf off central Veracruz, Mexico

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[The prevalence, fecundity, and size distribution of the isopod, Elthusa alvaradoensis, parasitizing the inshore lizardfish, Synodus foetens on the continental shelf off central Veracruz, Mexico, were studied. A total sample of 136 fish with a 46.3% prevalence of E. alvaradoensis was obtained during a survey cruise in February, 1996. The isopods were preferentially located on the second and third branchial arches; the lesions ranged from a slight abrasion of the branchial filaments to their complete removal. Mean host size did not vary significantly between the parasitized and unparasitized fractions. Maximum total length for male parasites was 12 mm, while female size ranged from 14.5 to 26.3 mm. Parasite fecundity varied from 100 to 2280 eggs and was unrelated to female size (p < 0.05). Male parasites exhibit a positive allometric growth, while this is negative for females. Se estudió la prevalencia, fecundidad y distribución de tallas del isópodo Elthusa alvaradoensis parasitando el lagarto máximo, Synodus foetens, en la plataforma central de Veracruz, México. De la muestra total de 136 peces obtenida de un crucero de estudio en febrero de 1996, la prevalencia de E. alvaradoensis fue del 46.3%. Los isópodos fueron localizados preferentemente en el segundo y tercer arco branquial; las lesiones observadas fueron desde la abrasión de los filamentos branquiales hasta la remoción completa de los mismos. La talla promedio del hospedero no varió significativamente entre la fracción parasitada y la no parasitada. La longitud total máxima de las machos parásitos fue de 12 mm, mientras la talla de las hembras varió de 14.5 a 26.3 mm. La fecundidad del parásito osciló de 100 a 2280 huevos y no se relacionó con la talla de la hembra (p < 0.05). Los machos parásitos exhiben crecimiento alométrico positivo y negativo en las hembras., The prevalence, fecundity, and size distribution of the isopod, Elthusa alvaradoensis, parasitizing the inshore lizardfish, Synodus foetens on the continental shelf off central Veracruz, Mexico, were studied. A total sample of 136 fish with a 46.3% prevalence of E. alvaradoensis was obtained during a survey cruise in February, 1996. The isopods were preferentially located on the second and third branchial arches; the lesions ranged from a slight abrasion of the branchial filaments to their complete removal. Mean host size did not vary significantly between the parasitized and unparasitized fractions. Maximum total length for male parasites was 12 mm, while female size ranged from 14.5 to 26.3 mm. Parasite fecundity varied from 100 to 2280 eggs and was unrelated to female size (p < 0.05). Male parasites exhibit a positive allometric growth, while this is negative for females. Se estudió la prevalencia, fecundidad y distribución de tallas del isópodo Elthusa alvaradoensis parasitando el lagarto máximo, Synodus foetens, en la plataforma central de Veracruz, México. De la muestra total de 136 peces obtenida de un crucero de estudio en febrero de 1996, la prevalencia de E. alvaradoensis fue del 46.3%. Los isópodos fueron localizados preferentemente en el segundo y tercer arco branquial; las lesiones observadas fueron desde la abrasión de los filamentos branquiales hasta la remoción completa de los mismos. La talla promedio del hospedero no varió significativamente entre la fracción parasitada y la no parasitada. La longitud total máxima de las machos parásitos fue de 12 mm, mientras la talla de las hembras varió de 14.5 a 26.3 mm. La fecundidad del parásito osciló de 100 a 2280 huevos y no se relacionó con la talla de la hembra (p < 0.05). Los machos parásitos exhiben crecimiento alométrico positivo y negativo en las hembras.]

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/content/journals/10.1163/156854005774445456
2005-07-01
2016-09-26

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