An intestinal Eimeria infection in juvenile Asian seabass (Lates calcarifer) cultured in Vietnam – A first report

Gibson-Kueh, Susan; Thủy, Nguyễn Thu; Elliot, Aileen; Jones, J. B.; Nicholls, P.K.; Thompson, R.C.A.

doi:10.1016/j.vetpar.2011.04.040

Cited by 18 publications

(22 citation statements)

References 39 publications

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“…infection in Malaysia was first published by Boulard (1977) In a study on parasites of specimens of L. calcarifer cultured in Malaysian cage cultures we also found coccidian oöcysts in the intestine of this species which we were able to examine from fresh material. The structure of the oöcysts of this coccidium corresponded to that reported earlier by Gibson-Kueh et al (2011a, b). Sporulated oöcysts of this species bear the typical signs of the genus Goussia Labbé, 1986.…”

Section: Among Infectious Diseases Viral Nervous Necrosis and A Bactsupporting

confidence: 86%

“…Although no developing stages were found in the histological sections and SEM preparations made from an advanced stage of development, the morphological identity of the oöcysts presented by Gibson-Kueh et al (2011a) from fixed material and the oöcysts found by us in the fresh intestinal mucus, proves that the two cases represent a single coccidian species of the epicellular type, described here as G. kuehae n. sp. The stages found by Gibson-Kueh et al (2011a) in the intestine of the Asian seabass in Vietnam, Australia and Malaysia were located epicellularly in the intestinal epithelium and thus resembled G. pannonica Molnár, 1989 and G. janae Lukeš & Dykova, 1990(see Molnár, 1989Lukeš & Dykova, 1990).…”

Section: Discussionmentioning

confidence: 46%

“…of the epicellular and nodular types, but true oöcyst residuum was found only in G. The failure to detect infection in histological sections and SEM preparations can be explained by the fact that at an advanced stage of infection already no developing stages existed in the first portion of the intestine from where the samples were taken. Nevertheless, the morphological identity of the oöcysts presented by Gibson-Kueh et al (2011a) from fixed material and the oöcysts found by us in the fresh intestinal mucus proves that oöcysts in both cases represent one species, i.e. G. kuehae n. sp.…”

Section: Discussionmentioning

confidence: 58%

“…The stages found by Gibson-Kueh et al (2011a) in the intestine of the Asian seabass in Vietnam, Australia and Malaysia were located epicellularly in the intestinal epithelium and thus resembled G. pannonica Molnár, 1989 and G. janae Lukeš & Dykova, 1990(see Molnár, 1989Lukeš & Dykova, 1990). However, G. kuehae differs from these two species described from cyprinids in several aspects.…”

Section: Discussionmentioning

confidence: 98%

“…Recently Gibson-Kueh et al (2011a, b) described a coccidian infection from the intestinal epithelium of L. calcarifer in Vietnam and Australia, caused by an epicellularly developing Eimeria sp. These authors studied ethanol-fixed sporulated oöcysts, made histological and ultrastructure studies and presented data on the molecular structure of the 18S rDNA of this parasite, but due to the lack of fresh material they failed to describe it as a named new species.…”

Section: Among Infectious Diseases Viral Nervous Necrosis and A Bactmentioning

confidence: 99%

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Description of Goussia kuehae n. sp. (Apicomplexa: Eimeriidae) infecting the Asian seabass, Lates calcarifer (Bloch) (Perciformes: Latidae), cultured in Malaysian fish farms

et al. 2013

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Culturing fishes in marine cages is a rapidly developing area of marine aquaculture.The Asian seabass Lates calcarifer (Bloch) is a fast growing good quality fish that is readily cultured in intensive systems in the South Asian region and in Malaysia in particular. Although several papers have been published to date on viral, bacterial, parasitic and fungal organisms causing diseases in the Asian seabass, the occurrence of a coccidian infection in this species has only recently been recorded. We collected sporulated and unsporulated oöcysts of a new species of Goussia Labbé, 1986, from the mucus covering the epithelium of the intestine of L. calcarifer.This paper provides a description of Goussia kuehae n. sp. Sporulated oöcysts of this species are ellipsoidal, 3740 μm in length and 2830 μm in width. The ellipsoidal sporocysts are relatively small, 15.2-17 × 5.78 μm, and located loosely in the oöcyst. There are residual bodies both in the oöcysts and the sporocysts. Goussia kuehae n. sp. differs from all known species of Goussia in the large size of the oöcysts and in having two types of oöcyst residuum.

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Section: Among Infectious Diseases Viral Nervous Necrosis and A Bactsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 46%

Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 98%

Section: Among Infectious Diseases Viral Nervous Necrosis and A Bactmentioning

confidence: 99%

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Description of Goussia kuehae n. sp. (Apicomplexa: Eimeriidae) infecting the Asian seabass, Lates calcarifer (Bloch) (Perciformes: Latidae), cultured in Malaysian fish farms

et al. 2013

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QTL Mapping for Resistance to Iridovirus in Asian Seabass Using Genotyping-by-Sequencing

et al. 2017

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Identifying quantitative trait loci (QTL) for viral disease resistance is of particular importance in selective breeding programs of fish species. Genetic markers linked to QTL can be useful in marker-assisted selection (MAS) for elites resistant to specific pathogens. Here, we conducted a genome scan for QTL associated with Singapore grouper iridovirus (SGIV) resistance in an Asian seabass (Lates calcarifer) family, using a high-density linkage map generated with genotyping-by-sequencing. One genome-wide significant and three suggestive QTL were detected at LG21, LG6, LG13, and LG15, respectively. The phenotypic variation explained (PVE) by the four QTL ranged from 7.5 to 15.6%. The position of the most significant QTL at LG21 was located between 31.88 and 36.81 cM. The SNP marker (SNP130416) nearest to the peak of this QTL was significantly associated with SGIV resistance in an unrelated multifamily population. One candidate gene, MECOM, close to the peak of this QTL region, was predicted. Evidence of alternative splicing was observed for MECOM and one specific category of splicing variants was differentially expressed at 5 days post-SGIV infection. The QTL detected in this study are valuable resources and can be used in the selective breeding programs of Asian seabass with regard to resistance to SGIV.

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Genetic mapping and coccidial parasites: Past achievements and future prospects

Clark

Blake

2012

J Biosci

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Coccidial parasites including Cryptosporidium parvum, Cyclospora cayetanensis, Neospora caninum, Toxoplasma gondii and the Eimeria species can cause severe disease of medical and veterinary importance. As many as one-third of the human population may carry T. gondii infection, and Eimeria are thought to cost the global poultry production industry in excess of US$2 billion per annum. Despite their significance, effective vaccines are scarce and have been confined to the veterinary field. As sequencing and genotyping technologies continue to develop, genetic mapping remains a valuable tool for the identification of genes that underlie phenotypic traits of interest and the assembly of contiguous genome sequences. For the coccidian, cross-fertilization still requires in vivo infection, a feature of their life cycle which limits the use of genetic mapping strategies. Importantly, the development of population-based approaches has now removed the need to isolate clonal lines for genetic mapping of selectable traits, complementing the classical clone-based techniques. To date, four coccidial species, representing three genera, have been investigated using genetic mapping. In this review we will discuss recent progress with these species and examine the prospects for future initiatives.

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An intestinal Eimeria infection in juvenile Asian seabass (Lates calcarifer) cultured in Vietnam – A first report

Abstract: An intestinal Eimeria infection in juvenile Asian seabass (Lates calcarifer

Cited by 18 publications

References 39 publications

Description of Goussia kuehae n. sp. (Apicomplexa: Eimeriidae) infecting the Asian seabass, Lates calcarifer (Bloch) (Perciformes: Latidae), cultured in Malaysian fish farms

Description of Goussia kuehae n. sp. (Apicomplexa: Eimeriidae) infecting the Asian seabass, Lates calcarifer (Bloch) (Perciformes: Latidae), cultured in Malaysian fish farms

QTL Mapping for Resistance to Iridovirus in Asian Seabass Using Genotyping-by-Sequencing

Genetic mapping and coccidial parasites: Past achievements and future prospects

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