Diphyllobothriosis in fish from freshwater ecosystems in southern Chile was first reported in 1949. Infection by plerocercoids of Diphyllobothrium latum and Diphyllobothrium dendriticum occurs in introduced trout (Oncorhynchus mykiss) and native fish. We determined the prevalence, mean intensity, and mean abundance of seasonal infection and tissue damage produced by Diphyllobothrium spp. in native fish (Percichthys trucha, Odontesthes mauleanum, and Basilichthys australis) and introduced trout (O. mykiss) from Lake Panguipulli, Chile. Prevalence, mean intensity, and mean abundance of D. latum infection were significantly greater in trout than they were in native fish. Prevalence and mean abundance were similar in O. mauleanum and P. trucha, but they were greater than those in B. australis. Prevalence and abundance were similar among seasons between sexes for the four hosts. For all host species, except P. trucha, there was a statistically significant positive correlation between host length and the abundance of plerocercoids. Infections in muscle tissue were present in 61% of trout compared with 23% in O. mauleanum and 12% in P. trucha, suggesting a greater risk for human infection when consuming trout. In general, prevalence of infection by D. dendriticum was lower than was D. latum prevalence. Encapsulation of plerocercoids was common and severe in 71% of the trout examined. Only slight encapsulation of plerocercoids was found in the native O. mauleanum, and no encapsulation was observed in P. trucha or B. australis. The greater concentration of plerocercoids in the walls of the digestive tract of trout suggests a more-rapid immune response in trout than in native fish. The low frequency of encapsulation of plerocercoids in native fish would mean greater tissue damage in the natives than that observed in the trout because they are free to migrate among the viscera, potentially endangering these native fish populations in regions where Diphyllobothrium spp. are endemic.
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PARASITOLOGY|
October 01 2012
PREVALENCE, INTENSITY, AND ABUNDANCE OF INFECTION AND PATHOGENESIS CAUSED BY DIPHYLLOBOTHRIOSIS IN VULNERABLE, NATIVE FISH AND INTRODUCED TROUT IN LAKE PANGUIPULLI, CHILE Open Access
Patricio Torres;
Patricio Torres
4
1 Instituto de Parasitología, Edificio de Ciencias Biomédicas, Isla Teja, Facultad de Medicina, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
4 Corresponding author (email: [email protected])
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Víctor Leyán;
Víctor Leyán
2 Instituto de Inmunología, Edificio de Ciencias Biomédicas, Isla Teja, Facultad de Medicina, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
3 Instituto de Patología Animal, Edificio Federico Saelzer, Isla Teja, Facultad de Ciencias Veterinarias. Universidad Austral de Chile, Casilla 567, Valdivia, Chile
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Sonia Puga
Sonia Puga
1 Instituto de Parasitología, Edificio de Ciencias Biomédicas, Isla Teja, Facultad de Medicina, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
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J Wildl Dis (2012) 48 (4): 937–950.
Article history
Received:
August 11 2011
Accepted:
April 05 2012
Citation
Patricio Torres, Víctor Leyán, Sonia Puga; PREVALENCE, INTENSITY, AND ABUNDANCE OF INFECTION AND PATHOGENESIS CAUSED BY DIPHYLLOBOTHRIOSIS IN VULNERABLE, NATIVE FISH AND INTRODUCED TROUT IN LAKE PANGUIPULLI, CHILE. J Wildl Dis 1 October 2012; 48 (4): 937–950. doi: https://doi.org/10.7589/2011-08-235
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