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• W1992038564 abstract "Proliferative gill disease (PGD) in channel catfish Ictalurus punctatus is caused by the myxozoan parasite Henneguya ictaluri. There is no effective treatment for PGD, and mortalities can exceed 50% in severe outbreaks. One approach to controlling losses would be to utilize a less susceptible ictalurid species in pond culture; alternatively, one could identify the traits that convey resistance and exploit them in a selective breeding program. Challenge studies have found less severe inflammatory responses in the gill tissue of blue catfish I. furcatus and fewer mortalities than in channel catfish. However, it remains unclear whether infection and subsequent plasmodial development progress the same way in the two species. To investigate this, we compared the dynamics of H. ictaluri infection in blue catfish, channel catfish, and channel catfish x blue catfish hybrids in continuous long-term (5-7-d) and short-term (24-h) pond challenges. After long-term challenge, 66.2% of the channel catfish and 63.6% of the hybrid catfish developed characteristic PGD lesions, compared with 3.7% of the blue catfish. Quantitative polymerase chain reaction analysis detected H. ictaluri in larger percentages of channel and hybrid catfish than blue catfish (98.7% and 95.7% versus 45.9%), with significantly greater parasite DNA equivalents in channel and hybrid catfish than blue catfish. Similar findings were obtained in the short-term exposures. Histologically, channel and hybrid catfish developed severe PGD accompanied by large numbers of developing plasmodia. While mild PGD was observed in some blue catfish, the progression of lesions lagged behind that in channel and hybrid catfish. Most importantly, developing plasmodia were not observed in blue catfish, and parasite DNA was not detected 14 d after removal from the source of infection. Our findings indicate that the resistance of blue catfish to H. ictaluri infection can be overcome by large numbers of infective actinospores but that infection appears to be eliminated before plasmodial development occurs." @default.
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• W1992038564 date "2010-03-01" @default.
• W1992038564 modified "2023-10-06" @default.
• W1992038564 title "Variation in Susceptibility to <i>Henneguya ictaluri</i> Infection by Two Species of Catfish and Their Hybrid Cross" @default.
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• W1992038564 doi "https://doi.org/10.1577/h09-030.1" @default.
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