Defeating diplostomoid dangers in USA catfish aquaculture
2004
Overstreet, R.M. | Curran, S.S. (The Univ. of Southern Mississippi, Ocean Springs (USA). Dept. of Coastal Sciences)
Diplostomoid digenean metacercariae have caused widescale mortalities of channel catfish, Ictalurus punctatus, at aquaculture farms in Louisiana, Mississippi and Arkansas, USA. Our group has shown, using ITS 1-2 plus three more-conservative gene fragments, that two sympatric species of Bolbophorus exist in the American white pelican. One, B. damnificus, infects the musculature of catfish, and the other, probably not B. confusus, does not infect catfish. However, at least four other pathogenic diplostomoids and a clinostomoid infect the catfish, and they use at least four different snail hosts, including the planorbids Planorbella trivolvis and Gyraulus parvus, the physid Physella gyrina and a lymnaeid. Two metacercariae, B. damnificus and Bursacetabulus pelecanus, infect the catfish and mature in the pelican; two others, Austrodiplostomum compactum and Hysteromorpha cf. triloba, mature in cormorants; one, Diplostomum sp., matures in seagulls and at least one, Clinostomum marginatum, matures in herons, egrets and other wading birds. Consequently, management of catfish ponds relative to digenean infections requires considerable biological information on the fish, bird, and snail hosts as well as the parasites.
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