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Diseases of Aquatic Organisms

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DAO 37:153-157 (1999)  -  doi:10.3354/dao037153

Effects of metacercariae (Digenea: Microphallidae) on the hepatopancreas of Chasmagnathus granulata (Decapoda: Grapsidae)

R. B. Robaldo1, J. Monserrat1, J. C. B. Cousin2, A. Bianchini1,*

1Departamento de Ciências Fisiológicas, 2 Departamento de Ciências Morfo-Biológicas, Fundação Universidade Federal do Rio Grande, CP 474, 96.201-900 - Rio Grande/RS, Brazil

ABSTRACT: We analysed the effects of infection by Microphallus szidati metacercariae on carbohydrate (glucose and glycogen) levels and histopathology of the hepatopancreas of the estuarine crab Chasmagnathus granulata. No significant differences in infection were found between the left and right sides of the hepatopancreas, and infection intensity ranged from 2 to 802. The mean intensity of metacercariae cysts was 54.79 ± 12.64 (±1 SE) with a prevalence of 90.1%. Hepatopancreatic glycogen was higher in infected crabs (28.2 ± 2.2 mg g-1 tissue) than in non-infected ones (21.7 ± 1.9 mg g-1 tissue). Further, high intensities of infection (>6 parasites per tissue section) promoted necrosis of the hepatopancreatic tubules and hemocytic infiltration around the cysts. Thus, the presence of M. szidati metacercariae in the hepatopancreas of C. granulata can cause structural damage to the tissue, altering its glycogen levels, and can be considered as a potential physiological stress factor.

KEY WORDS: Parasitism · Carbohydrates · Crab · Hepatopancreas · Physiology

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