Ichthyodinium identified in the eggs of European eel (Anguilla anguilla) spawned in captivity

Sørensen, Sune Riis; Tomkiewicz, Jonna; Skovgaard, Alf

doi:10.1016/j.aquaculture.2014.02.002

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…Based on the molecular data, genetically identical parasite species can infect several different fi sh eggs ). Although two genotypes have been found between the parasites from different regions, i.e., Atlantic region and Pacifi c region (South East Asia), the sequence differences of SSU rDNA between these two genotypes are rather small (98 % identity) and whether these two genotypes represent distinct species or not is not clear (Sørensen et al 2014 ) .…”

Section: Syndiniophyceaementioning

confidence: 99%

Diversity and Phylogeny of Marine Parasitic Dinoflagellates

Horiguchi

2015

Marine Protists

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The dinofl agellates are an assemblage of autotrophic, myxotrophic and heterotrophic species and play important roles in marine ecosystems. Most of them are free-living, but several are known as symbionts of marine invertebrates or as parasites of aquatic animals and protists. Molecular phylogenetic studies on parasitic dinofl agellates reveal that the parasitism has evolved polyphyletically appearing several times independently within the division Dinophyta. The Dinophyta consists of "core" dinofl agellates (typical dinofl agellates) and "basal" dinofl agellates. Within the basal dinofl agellates, the parasitic clades of Perkinsea, Ellobiophyceae and Syndiniophyceae are recognized. A large portion of environmental clone sequences recovered from various parts of the oceanic environments are thought to be members of the parasitic order Syndiniales (Syndiniophyceae). Therefore, the ecological function of parasitic dinofl agellates in the ocean is now better understood. The members of parasitic genera such as Parvilucifera (Perkinsea) and Amoebophrya (Syndiniophyceae) infect other dinofl agellates; therefore, much attention has been paid, because of their possible ability to control harmful algal blooms (HABs). The parasitism has also evolved within the "core" dinofl agellates (Dinophyceae) a number of times. These include Blastodinium , Chytriodinium , Dissodinium , Haplozoon , Oodinium , Paulsenella and Tintinnophagus. Because there are already several reviews on diversity of parasitic dinofl agellates, in this volume, only recent developments in phylogenetic studies on parasitic marine dinofl agellates are mainly reviewed here.

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Section: Syndiniophyceaementioning

confidence: 99%

Diversity and Phylogeny of Marine Parasitic Dinoflagellates

Horiguchi

2015

Marine Protists

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“…For the first time, mass fish mortality from this parasite was observed when the studies were con ducted on the Mediterranean coast of Algeria [3,4]. Our knowledge of Ichthyodinium biology and geo graphical distribution is much replenished in recent years [1,[5][6][7][8][9]11], but there is still no comprehensive description of its life cycle. I. chabelardi development can be divided into two parts.…”

mentioning

confidence: 99%

Free-living stages of the life cycle of the parasitic dinoflagellate Ichthyodinium chabelardi Hollande et J. Cachon, 1952 (Alveolata: Dinoflagellata)

et al. 2015

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“…In the Baltic Sea, it has been detected in Atlantic cod (Gadus morhua) (Pedersen et al, 1993;Skovgaard et al, 2010) and turbot (Scopthalmus maximus) (Pedersen, 1993). Sørensen et al (2014) documented the presence of this parasite in the eggs of wild and domestic European eels (Anguilla Anguilla) in both marine and inland lakes (Sørensen et al, 2014). Finally, I. chabelardi has been widely identified in artificial tanks containing tropical species such as the leopard coral grouper (Plectropomus leopardus) (Mori et al, 2007), yellowfin tuna (Thunnus albacares) (Yuasa et al, 2007) and Pacific bluefin tuna (T. orientalis) (Ishimaru et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…I. chabelardi (class Syndinophyceae, order Syndiniales) is an endobiotic parasite found in the yolk of embryos and yolk sac larvae of several fish species in both marine ecosystems and aquaculture tanks. While Sørensen et al (2014) proposed the existence of two ribotypes, the genus Ichthyodinium is considered a single species. This parasite has a complex life cycle, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, previous studies indicate the urgent need for long-term investigations and consider I. chabelardi to be an emerging pathogen that could spread into new marine ecosystems and possibly into freshwater ecosystems due to rising seawater temperatures (Sørensen et al, 2014;Gleason et al, 2019). In this context, the primary objective of this study was to use DNA barcoding to develop and validate a genetic method to examine the presence and possible prevalence of I. chabelardi in European sardine eggs from the northwestern Mediterranean Sea (Catalan coast).…”

Section: Introductionmentioning

confidence: 99%

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A new threat to Sardina pilchardus in the northwestern Mediterranean: Genetic validation of the presence of lethal parasites in pelagic eggs and ovaries

FRIGOLA-TEPE,

PÉREZ-BIELSA,

CABALLERO-HUERTAS

et al. 2024

Mediterr. Mar. Sci.

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Over the past few decades, the fishing industry and species conservationists have grown increasingly concerned about the decrease in catches and poor health of European sardines (Sardina pilchardus), particularly in the northwestern Mediterranean region. The species is threatened by a number of factors, including parasite illnesses, rising seawater temperatures, and overfishing. Increasing seawater temperatures due to climate change might lead to the proliferation of protistan parasites, such as Ichthyodinium chabelardi. This parasite has been documented in the literature to cause 100% larval mortality in sardines, which may have detrimental effects on fish populations and the fishing industry. We confirmed the existence of I. chabelardi in pelagic eggs and the ovaries of European sardines from the Catalan coast (northwestern Mediterranean) by means of stereomicroscopic analysis and a genetic methodology for parasite identification. The incidence of this infection was 22.5% in ovarian tissue and 11.5% in eggs. In this study, we present new data on the vertical transmission of I. chabelardi from one generation to another in sardines captured in the Mediterranean region. Interpreting outbreaks of I. chabelardi, especially in sardine populations, requires further research into the transmission of infection and improving our understanding of protozoan parasites.

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Ichthyodinium identified in the eggs of European eel (Anguilla anguilla) spawned in captivity

Cited by 7 publications

References 26 publications

Diversity and Phylogeny of Marine Parasitic Dinoflagellates

Diversity and Phylogeny of Marine Parasitic Dinoflagellates

Free-living stages of the life cycle of the parasitic dinoflagellate Ichthyodinium chabelardi Hollande et J. Cachon, 1952 (Alveolata: Dinoflagellata)

A new threat to Sardina pilchardus in the northwestern Mediterranean: Genetic validation of the presence of lethal parasites in pelagic eggs and ovaries

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