MYXOZOAN COMMUNITY COMPOSITION AND DIVERSITY IN CLINICAL CASES OF PROLIFERATIVE GILL DISEASE IN MISSISSIPPI CATFISH AQUACULTURE.

Autor:	Stilwell JM; Department of Pathology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, Georgia 30602., Griffin MJ; Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776.; Thad Cochran National Warmwater Aquaculture Center, Delta Research and Extension Center, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776., Waldbieser GC; USDA-ARS, Warmwater Aquaculture Research Unit, 141 Experiment Station Road, Stoneville, Mississippi 38776., Stanton JB; Department of Pathology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, Georgia 30602., Leary JH; Department of Pathology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, Georgia 30602., Khoo LH; Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776.; Thad Cochran National Warmwater Aquaculture Center, Delta Research and Extension Center, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776., Steadman JM; Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776.; Thad Cochran National Warmwater Aquaculture Center, Delta Research and Extension Center, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776., Ware C; Department of Pathobiology and Population Medicine, College of Veterinary Medicine, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776.; Thad Cochran National Warmwater Aquaculture Center, Delta Research and Extension Center, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776., Wise DJ; Thad Cochran National Warmwater Aquaculture Center, Delta Research and Extension Center, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776.; Department of Wildlife, Fisheries and Aquaculture, College of Forest Resources, Mississippi Agricultural and Forestry Experiment Station, Mississippi State University, 127 Experiment Station Road, Stoneville, Mississippi 38776., Camus AC; Department of Pathology, College of Veterinary Medicine, University of Georgia, 501 D. W. Brooks Drive, Athens, Georgia 30602.
Jazyk:	angličtina
Zdroj:	The Journal of parasitology [J Parasitol] 2022 Mar 01; Vol. 108 (2), pp. 132-140.
DOI:	10.1645/21-57
Abstrakt:	An abundance of morphologically variable Henneguya species complicates the understanding of disease relationships between ictalurid catfish and myxozoan (Phylum: Cnidaria) parasites on North American aquaculture operations. Henneguya ictaluri, the cause of proliferative gill disease (PGD) in channel and hybrid catfish, is arguably the most important parasite of commercial catfish aquaculture in the southeastern United States. While research indicates arrested development and limited sporogenesis of H. ictaluri in channel (Ictalurus punctatus) × blue (Ictalurus furcatus) hybrid catfish, incidents of PGD persist in hybrid production systems. This work investigated the influence of fish host on myxozoan community composition and diversity within naturally infected gill tissues from diagnostic case submissions to the Aquatic Research and Diagnostic Laboratory in Stoneville, Mississippi, from 2017 to 2019. Gills collected from farm-raised catfish with clinical PGD were subjected to metagenomic amplicon sequencing of the myxozoan 18S SSU rDNA gene diagnostic variable region 3 (DVR3). Myxozoan community composition significantly differed between channel and hybrid catfish PGD cases, with channel catfish having more diverse community structures. Channel catfish gills had a greater relative abundance of H. ictaluri in 2017 and 2019, while no differences were observed in 2018. Importantly, H. ictaluri was present in all channel and hybrid catfish PGD cases across all years; however, H. ictaluri was not the most abundant myxozoan in almost half the cases examined, suggesting other myxozoan species may also contribute to PGD pathology. The detection of numerous known and unclassified myxozoan sequences in addition to H. ictaluri provides evidence PGD may involve mixed species infections. Furthermore, the presence of numerous unclassified myxozoan sequences in gill samples from clinical PGD cases indicates the number of described species from U.S. farm-raised catfish vastly underestimates the true myxozoan diversity present within the varied pond microcosms associated with catfish aquaculture. (© American Society of Parasitologists 2022.)
Databáze:	MEDLINE
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