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Saha M, Bandyopadhyay P. Morphological and ssrDNA sequence based molecular characterization of a novel Thelohanellus species (Myxosporea: Myxobolidae) infecting the fins of Goldfish, Carassius auratus L. with special reference to its histopathological alteration. Acta Trop 2018; 181:25-34. [PMID: 29407849 DOI: 10.1016/j.actatropica.2018.01.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 01/26/2018] [Indexed: 11/25/2022]
Abstract
A new species of myxozoan, Thelohanellus goldi n. sp. is described using morphological and molecular data, parasitizing the fin filaments from 18 of 25 host specimens (72.5%) of Carassius auratus collected from different ornamental fish farms of India. Mature spore of the new species were oval to spherical in frontal view having rounded posterior ends and tapering anterior end measures 8.7-10.26 (9.50) × 4.10-7.89 (5.84) μm. The single large polar capsule, round to oval in shape but slightly pointed at the anterior end measuring 4.91-7.63 (5.60) × 2.3-3.1 (2.96) μm and located just below the anterior end of the spore. Polar filament only at distal end with 5-6 loose coils. The most differentiating feature from closely related species was carried out by morpho-taxonomic affinities with previously described species which are tremendously supported by molecular taxonomy by partial sequencing of the 18S rDNA gene resulted in a total of 2124 bp fragment of newly obtained small subunit ribosomal RNA gene sequence of the new species which Exhibit 93-95% homogeneity with other closely related species available in GenBank. The BLAST search and high genetic diversity of distance matrix of Myxobolus sp. did not properly match with any available sequences in GenBank and make sister clade with Thelohanellus caudatus and Thelohanellus habibpuri in the Thelohanellus clade including most of Thelohanellus spp. The study of evolutionary history enables us to understand the evolution of modern species and supports some uncertain topologies which are being presented regarding the morphometric analysis. The severity of myxozoan infection has been assessed in this article by observing the histopathological changes of fins of the C. auratus along with the diversity, distribution and taxonomic description of the new Thelohanellus species with their new host and locality records.
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Reise K, Buschbaum C, Büttger H, Rick J, Wegner KM. Invasion trajectory of Pacific oysters in the northern Wadden Sea. MARINE BIOLOGY 2017; 164:68. [PMID: 28316346 PMCID: PMC5337518 DOI: 10.1007/s00227-017-3104-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 02/09/2017] [Indexed: 06/06/2023]
Abstract
Invasion trajectories of introduced alien species usually begin with a long establishment phase of low abundance, often followed by exponential expansion and subsequent adjustment phases. We review the first 26 years of feral Pacific oysters Crassostrea gigas around the island of Sylt in the Wadden Sea (North Sea, NE Atlantic), and reveal causal conditions for the invasion phases. Sea-based oyster farming with repeated introductions made establishment of feral oysters almost inevitable. Beds of mussels Mytilus edulis on mud flats offered firm substrate for attachment and ideal growth conditions around low tide level. C. gigas mapped on to the spatial pattern of mussel beds. During the 1990s, cold summers often hampered recruitment and abundances remained low but oyster longevity secured persistence. Since the 2000s, summers were often warmer and recruitment more regular. Young oysters attached to adult oysters and abundances of >1000 m-2 were achieved. However, peak abundance was followed by recruitment failure. The population declined and then was also struck by ice winters causing high mortality. Recovery was fast (>2000 m-2) but then recruitment failed again. We expect adjustment phase will proceed with mean abundance of about 1000 m-2 but density-dependent (e.g., diseases) and density-independent (e.g., weather anomalies) events causing strong fluctuations. With continued global warming, feral C. gigas at the current invasion fronts in British estuaries and Scandinavian fjords may show similar adjustment trajectories as observed in the northern Wadden Sea, and also other marine introductions may follow the invasion trajectory of Pacific oysters.
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Affiliation(s)
- Karsten Reise
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Wadden Sea Station Sylt, Hafenstr. 43, 25992 List, Bremerhaven, Germany
| | - Christian Buschbaum
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Wadden Sea Station Sylt, Hafenstr. 43, 25992 List, Bremerhaven, Germany
| | - Heike Büttger
- BioConsult SH, Schobüller Str. 36, 25813 Husum, Germany
| | - Johannes Rick
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Wadden Sea Station Sylt, Hafenstr. 43, 25992 List, Bremerhaven, Germany
| | - K. Mathias Wegner
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Wadden Sea Station Sylt, Hafenstr. 43, 25992 List, Bremerhaven, Germany
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Gbankoto A, Tossavi ND, Sindété M, Sakiti GN, Moutaïrou K, Ribou AC. Some pathophysiological insights into ovarian infestation by Myxobolus sp. (Myxozoa: Myxosporea) in Clarias gariepinus (Clariids: Silurids) from Bénin (West Africa). Parasitol Res 2015; 114:2941-9. [DOI: 10.1007/s00436-015-4496-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Accepted: 04/20/2015] [Indexed: 11/28/2022]
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Description of Myxobolus balatonicus n. sp. (Myxozoa: Myxobolidae) from the common carp Cyprinus carpio L. in Lake Balaton. Syst Parasitol 2015; 91:71-9. [DOI: 10.1007/s11230-015-9560-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 03/05/2015] [Indexed: 10/23/2022]
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Molnár K, Székely C. Tissue preference of some myxobolids (Myxozoa: Myxosporea) from the musculature of European freshwater fishes. DISEASES OF AQUATIC ORGANISMS 2014; 107:191-198. [PMID: 24429470 DOI: 10.3354/dao02688] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
For several species of fish myxosporeans known at present, the musculature has been designated as the location of intrapiscine development. In the majority of these cases, plasmodia and spores are actually found in the muscle cells, but there are also myxosporeans that select intermuscular connective tissue, fish bones, nerves and capillaries of the musculature as their site of development. During the plasmodial development of Myxobolus, Henneguya and Thelohanellus species in fish inhabiting Hungarian freshwaters, 3 main locations of development inside the muscles were identified. Pseudodispar-type plasmodia, such as M. cyprini, M. musculi and M. pseudodispar, form plasmodia intracellularly in the muscle cells, while the plasmodia of M. pfeifferi, M. sandrae and T. hovorkai develop in the intermuscular connective tissue. A similar development in the connective tissue of the ventricle and the bulbus arteriosus was observed for M. dogieli, a heart parasite found in some cyprinid fishes. The third type of development is represented by M. tauricus, which prefers the collagenous elements of the fin rays, but its plasmodia are commonly found in the muscle attached to the fish bones.
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Affiliation(s)
- Kálmán Molnár
- Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, PO Box 18, 1581 Budapest, Hungary
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Ye LT, Li WX, Wang WW, Wu SG, Wang GT. Updated morphology, histopathology and molecular phylogeny of Myxobolus hearti, cardiac myxosporea in gibel carp, Carassius gibelio (Bloch). JOURNAL OF FISH DISEASES 2014; 37:11-20. [PMID: 24341506 DOI: 10.1111/jfd.12026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Revised: 07/29/2011] [Accepted: 11/07/2011] [Indexed: 06/03/2023]
Abstract
The original description of Myxobolus hearti is supplemented with new data on spore morphology, histopathology and molecular phylogeny. Myxobolus hearti are found in the heart ventricle of the gibel carp, Carassius gibelio (Bloch), where they form whitish oval or irregularly shaped plasmodia. Mature spores are oval or shortly ellipsoidal in frontal view, lemon-shaped in sutural view and eye-shaped in apical view. The spores are 14.12 ± 0.35 (13.6-15) μm long (mean ± SD), 11.85 ± 0.34 ± 0.36 (11-12) μm wide and 7.32 ± 0.36 (7-8) μm thick. The two polar capsules are equal in size, 6.11 ± 0.29 (6-7) μm long and 3.89 ± 0.31(3-4) μm wide, and are long pyriform in shape. Polar filaments have six or seven coils situated perpendicular to the longitudinal axis of the polar capsules. Histopathology indicates that the plasmodia are encased by the host connective tissue, and no inflammatory responses are found in the heart ventricles. Phylogenetic analysis based on the 18S small-subunit ribosomal DNA sequences indicates that M. hearti is, genetically, most similar to Henneguya doneci, a gill-infecting species.
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Affiliation(s)
- L T Ye
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China; Graduate School of the Chinese Academy of Sciences, Beijing, China
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Carriero MM, Adriano EA, Silva MRM, Ceccarelli PS, Maia AAM. Molecular phylogeny of the Myxobolus and Henneguya genera with several new South American species. PLoS One 2013; 8:e73713. [PMID: 24040037 PMCID: PMC3764033 DOI: 10.1371/journal.pone.0073713] [Citation(s) in RCA: 132] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Accepted: 07/04/2013] [Indexed: 12/01/2022] Open
Abstract
The present study consists of a detailed phylogenetic analysis of myxosporeans of the Myxobolus and Henneguya genera, including sequences from 12 Myxobolus/Henneguya species, parasites of South American pimelodids, bryconids and characids. Maximum likelihood and maximum parsimony analyses, based on 18 S rDNA gene sequences, showed that the strongest evolutionary signal is the phylogenetic affinity of the fish hosts, with clustering mainly occurring according to the order and/or family of the host. Of the 12 South American species studied here, six are newly described infecting fish from the Brazilian Pantanal wetland. Henneguya maculosus n. sp. and Myxobolus flavus n. sp. were found infecting both Pseudoplatystoma corruscans and Pseudoplatystoma reticulatum; Myxobolus aureus n. sp. and Myxobolus pantanalis n. sp. were observed parasitizing Salminus brasiliensis and Myxobolus umidus n. sp. and Myxobolus piraputangae n. sp. were detected infecting Brycon hilarii.
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MESH Headings
- Animals
- Brazil
- DNA, Protozoan/chemistry
- DNA, Protozoan/genetics
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/genetics
- Fish Diseases/parasitology
- Fishes/classification
- Fishes/parasitology
- Molecular Sequence Data
- Myxozoa/anatomy & histology
- Myxozoa/classification
- Myxozoa/genetics
- Parasitic Diseases, Animal/parasitology
- Phylogeny
- Polymerase Chain Reaction
- RNA, Ribosomal, 18S/classification
- RNA, Ribosomal, 18S/genetics
- Sequence Analysis, DNA
- Species Specificity
- Spores, Protozoan/cytology
- Spores, Protozoan/genetics
- Wetlands
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Affiliation(s)
- Mateus Maldonado Carriero
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Edson A. Adriano
- Departamento de Ciências Biológicas, Universidade Federal de São Paulo, Diadema, São Paulo, Brazil
- Departamento de Biologia Animal, Instituto de Biologia, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil
- * E-mail:
| | - Márcia R. M. Silva
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
| | - Paulo S. Ceccarelli
- Centro Nacional de Pesquisa e Conservação de Peixes Continentais, Instituto Chico Mendes de Conservação da Biodiversidade, Pirassununga, São Paulo, Brazil
| | - Antonio A. M. Maia
- Departamento de Medicina Veterinária, Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, São Paulo, Brazil
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Molnár K, Cech G, Székely C. Histological and molecular studies of species of Myxobolus Bütschli, 1882 (Myxozoa: Myxosporea) in the gills of Abramis, Blicca and Vimba spp. (Cyprinidae), with the redescription of M. macrocapsularis Reuss, 1906 and M. bliccae Donec & Tozyyakova, 1984. Syst Parasitol 2011; 79:109-21. [DOI: 10.1007/s11230-011-9292-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Accepted: 01/03/2011] [Indexed: 11/24/2022]
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Adriano E, Arana S, Alves A, Silva M, Ceccarelli P, Henrique-Silva F, Maia A. Myxobolus cordeiroi n. sp., a parasite of Zungaro jahu (Siluriformes: Pimelodiade) from Brazilian Pantanal: Morphology, phylogeny and histopathology. Vet Parasitol 2009; 162:221-9. [DOI: 10.1016/j.vetpar.2009.03.030] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2008] [Revised: 03/05/2009] [Accepted: 03/14/2009] [Indexed: 10/21/2022]
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Some remarks on the occurrence, host-specificity and validity of Myxobolus rotundus Nemeczek, 1911 (Myxozoa: Myxosporea). Syst Parasitol 2008; 72:71-9. [PMID: 19048408 DOI: 10.1007/s11230-008-9161-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2008] [Accepted: 08/04/2008] [Indexed: 10/21/2022]
Abstract
Myxobolus rotundus Nemeczek, 1911 is a common and specific parasite of the common bream Abramis brama (L.). Small, round or ellipsoidal shaped plasmodia of this species develop in the gill and exhibit strong histotropism to the secondary gill lamellae with plasmodial development in their capillary network. M. rotundus is frequently found in mixed infection with M. bramae Reuss, 1906, a parasite of the afferent arteries of gill filaments. The round spores of M. rotundus resemble several other Myxobolus spp., but can be distinguished from these by their small subunit ribosomal RNA gene sequence (GenBank accession no. EU710583), which also differs from the sequence for 'M. rotundus' from the skin of Chinese goldfish Carassius auratus auratus (L.), which we suggest has been misidentified. The SSU rRNA gene sequence of M. rotundus myxospores from bream corresponded to Triactinomyxon type 4 actinospores (AY495707) isolated from Tubifex tubifex (Müller) by Hallett et al. (2005), and we infer from this that these are alternate life stages.
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