title: Henneguya pagri n. sp. (Myxozoa: Myxosporea) causing cardiac henneguyosis in red sea bream, Pagrus major (Temminck & Schlegel).
abstract: Henneguya pagri n. sp. (Myxozoa: Myxosporea) is described from netpen-cultured red sea bream, Pagrus major, in Japan. Affected fish displayed anaemic gills, an enlarged bulbus arteriosus and internal haemorrhaging in the pericardial cavity. Disease outbreaks occurred during the summer and the prevalence of infection reached 75% in August. Plasmodia of H. pagri developed in the bulbus arteriosus of red sea bream, in which degenerative cardiomyopathy was observed. Following maturation of the parasite, the influx of spores into the gills caused congestion of the gill capillaries, resulting in proliferative branchitis. Spores (10.5 x 7.5 microm) were ovoid with two caudal appendages (29.6 microm in average length), with a whip-like extension from the end. Partial small subunit ribosomal RNA gene sequences of H. pagri are closely related to those of H. lateolabracis infecting the bulbus arteriosus of Chinese sea bass, Lateolabrax sp.
authors.affiliation: Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan. ayokoh@mail.ecc.u-tokyo.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Yokoyama
authors.forename: N
authors.initials: N
authors.lastname: Itoh
authors.forename: S
authors.initials: S
authors.lastname: Tanaka
mesh_terms: D000818:Animals; D001483:Base Sequence; D016000:Cluster Analysis; D017931:DNA Primers; D004196:Disease Outbreaks / Q000662:veterinary*; D056890:Eukaryota / Q000235:genetics*; D005393:Fish Diseases / Q000453:epidemiology* / Q000469:parasitology* / Q000473:pathology; D005880:Gills / Q000473:pathology; D007564:Japan / Q000453:epidemiology; D016013:Likelihood Functions; D008957:Models, Genetic; D008969:Molecular Sequence Data; D009206:Myocardium / Q000473:pathology; D010802:Phylogeny; D015995:Prevalence; D011529:Protozoan Infections, Animal / Q000453:epidemiology / Q000473:pathology*; D012335:RNA, Ribosomal / Q000235:genetics; D021541:Sea Bream; D017422:Sequence Analysis, DNA / Q000662:veterinary; D033761:Spores, Protozoan / Q000166:cytology*
chemical_list: D017931:DNA Primers; D012335:RNA, Ribosomal