Validity, impacts and seasonal prevalence of Henneguya species infecting catfish Clarias gariepinus from River Nile, Egypt

Abdel‐Baki, Abdel‐Azeem S.; Sakran, Th.; Zayed, Eman

doi:10.1007/s00436-010-2234-y

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…Some other myxosporean species, however, have showed a higher prevalence in summer and a lower prevalence during other seasons (Abdel‐Baki et al. ; Yemmen et al. ; Yokoyama et al.…”

Section: Discussionmentioning

confidence: 99%

Molecular and Morphometric Characteristics of Ceratomyxa hamour n. sp. (Myxosporea: Bivalvulida) Infecting the Gallbladder of the Orange‐spotted Grouper Epinephelus coioides from the Arabian Gulf, Saudi Arabia

Mansour

Al-Qahtani

Al‐Quraishy

et al. 2014

J Eukaryotic Microbiology

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Ceratomyxa hamour n. sp. was found to infect the gallbladder of the orangespotted grouper, Epinephelus coioides located off the Saudi Arabian coast of the Arabian Gulf. The infection was reported as a free-floating spore in the bile, and pseudoplasmodia were not observed. Mature spores were crescentshaped and measured on average 7 lm in length and 16 lm in thickness. The polar capsule, meanwhile, had length to width measurements of 4 lm and 3 lm on average. A periodical survey was conducted throughout a sampling period between December 2012 and December 2013, with the results showing that the parasite was present throughout the year with a mean prevalence of 32.6%. The objective of this study was to characterize this new species based on its morphological and molecular differences from previously described species. Molecular analysis based on the partial sequence of the SSU rDNA gene, showed the highest similarity (97.8%) to Ceratomyxa buri, reported in the cultured yellow tail Seriola quinqueradiata in Japan. Indeed, C. buri and the new species described here formed an individual cluster with a high degree of bootstrap support. This is the first reported species of genus Ceratomyxa from the Arabian Gulf fishes off Saudi Arabia.

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“…Some other myxosporean species, however, have showed a higher prevalence in summer and a lower prevalence during other seasons (Abdel‐Baki et al. ; Yemmen et al. ; Yokoyama et al.…”

Section: Discussionmentioning

confidence: 99%

Molecular and Morphometric Characteristics of Ceratomyxa hamour n. sp. (Myxosporea: Bivalvulida) Infecting the Gallbladder of the Orange‐spotted Grouper Epinephelus coioides from the Arabian Gulf, Saudi Arabia

Mansour

Al-Qahtani

Al‐Quraishy

et al. 2014

J Eukaryotic Microbiology

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“…(Saleh, 2015). Some key similarities and differences were its caudal appendage was shorter than present in Henneguya sp., whereas H. postexilis (Woodyard et al, 2022) and H. suprabranchiae (Abdel-Baki et al, 2011) have similar lengths for both spore body and caudal appendage, but they have unequal polar capsules. In addition although H. samochimensis (Reed et al, 2003) has a similar caudal appendage length it has slightly different dimensions of the other structures.…”

Section: Remarksmentioning

confidence: 99%

Characterizing Two New Henneguya Species in the Respiratory Organs of African Sharptooth Catfish

Emeish,

Fawaz,

Hussein

et al. 2023

Microscopy and Microanalysis

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Henneguya species are myxozoans, a suborder of Cnidaria, which can affect the gills and extrarespiratory organs of the African sharptooth catfish, Clarias gariepinus. This research describes natural infection-induced histological alterations caused by the Henneguya species present. The Henneguya species were also identified molecularly using DNA sequenced from infected tissue cysts, and phylogenetically analyzed. Clinical investigations revealed cyst-like nodules on the fish gill filaments and extrarespiratory organs. Within a milky fluid inside the cysts were several Henneguya-like spores. Henneguya sp. infested 27.5% of the fish, with the highest prevalence in the gills compared to the extrarespiratory organs. The Henneguya species parasitized the gill and the dendritic tissues, resulting in histopathological characteristics. The plasmodia's developmental stages resulted in destructive damage which manifested as marked necrosis, which was replaced by a focal aggregation of inflammatory cells. Amplification of the 18S ribosomal DNA from the fish parasites was followed by sequencing, which confirmed their identities as new species Henneguya qenabranchiae n. sp. and Henneguya qenasuprabranchiae n. sp. with 99.53 and 99.64% identities, respectively, to Henneguya sp. 1 HS-2015. The two C. gariepinus myxozoans shared some characteristics based on morphologic and phylogenetic analysis as previously published, where it was proposed that they were a sister lineage to Henneguya species in Egypt, and it is now proposed that they are new species.

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Henneguya mauritaniensis n. sp. (Myxozoa) from the arterial bulb of Pagrus caeruleostictus (Valenciennes, 1830) off Mauritania

et al. 2012

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We describe a new species of myxozoan, Henneguya mauritaniensis n. sp., extracted from the arterial bulb of the bluespotted seabream, Pagrus caeruleostictus (Valenciennes, 1830), collected in Mauritanian waters. Out of the 209 individuals examined, 30.1 % were infected with this new taxon. Spore total length ranged from 15.0 to 20.5 μm with a mean of 17.9 μm. The two polar capsules were equal in size, and pyriform and caudal appendages joined until mid-length. Morphometric analysis revealed significant differences between H. mauritaniensis n. sp. and morphologically similar species from this region as well as congeners known from other sparid hosts. Phylogenetic analysis of 18 S rDNA indicated that this new species is closely related to Henneguya pagri, reported recently from Pagrus major off Japan. Bayesian inference and maximum likelihood analyses of the 18 S rDNA dataset also revealed that species of marine Henneguya reported forming pseudocysts in the hearts of their fish hosts were closely related. Histological analysis of the H. mauritaniensis n. sp. pseudocysts embedded in the arterial bulb of P. caeruleostictus suggests that these parasites may cause considerable pathology, which may impact negatively on the health of the fish host. Finally, we discussed the importance of a combination of morphological and molecular analysis for species description because of high variability in size within the same taxa.

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Validity, impacts and seasonal prevalence of Henneguya species infecting catfish Clarias gariepinus from River Nile, Egypt

Cited by 6 publications

References 16 publications

Molecular and Morphometric Characteristics of Ceratomyxa hamour n. sp. (Myxosporea: Bivalvulida) Infecting the Gallbladder of the Orange‐spotted Grouper Epinephelus coioides from the Arabian Gulf, Saudi Arabia

Molecular and Morphometric Characteristics of Ceratomyxa hamour n. sp. (Myxosporea: Bivalvulida) Infecting the Gallbladder of the Orange‐spotted Grouper Epinephelus coioides from the Arabian Gulf, Saudi Arabia

Characterizing Two New Henneguya Species in the Respiratory Organs of African Sharptooth Catfish

Henneguya mauritaniensis n. sp. (Myxozoa) from the arterial bulb of Pagrus caeruleostictus (Valenciennes, 1830) off Mauritania

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