Perkinsus infection is associated with alterations in the level of global DNA methylation of gills and gastrointestinal tract of the oyster Crassostrea gasar

Bivalves are filter feeders that obtain food from seawater that may contain infectious agents, such as the protozoan parasites Perkinsus marinus and P. olseni that are associated with massive mortalities responsible for losses in the aquaculture industry. Despite all physical and chemical barriers, microorganisms cross epithelia and infect host tissues to cause pathologies. Epigenetics mechanisms … Continue reading Perkinsus infection is associated with alterations in the level of global DNA methylation of gills and gastrointestinal tract of the oyster Crassostrea gasar

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Survey of bivalve molluscs for Bonamia spp. and other parasitic pathogens in Florida east coast lagoons

A 2007 study of Suminoe (Crassostrea ariakensis) and eastern (Crassostrea virginica) oysters exposed to Indian River Lagoon (IRL), Florida waters revealed the presence of Bonamia spp. in exposed oysters. In 2010, a survey of oysters and other bivalves (n = 721, 18 species) was conducted in the southern IRL (10 sites) and in the more … Continue reading Survey of bivalve molluscs for Bonamia spp. and other parasitic pathogens in Florida east coast lagoons

Possible impacts of zoosporic parasites in diseases of commercially important marine mollusc species: part II. Labyrinthulomycota

The phylum Labyrinthulomycota comprises diverse marine fungus-like protists that are an abundant and widespread component of the marine microbiota. Despite their ubiquity in marine ecosystems, relatively little is known about the ecology of any of the pathogenic species in the Labyrinthulomycota. Most are thought to exist as saprobes, but many species have been documented as … Continue reading Possible impacts of zoosporic parasites in diseases of commercially important marine mollusc species: part II. Labyrinthulomycota

Effect of dose and frequency of exposure to infectious stages on trematode infection intensity and success in mussels

Marine parasites such as trematodes often compromise the fitness of their hosts. Such effects are generally considered to be density-dependent, i.e. the greater the infection intensity in the host, the greater the detrimental impact on host fitness. However, the mechanisms determining infection in marine hosts are still poorly understood. Here, we investigated the effect of … Continue reading Effect of dose and frequency of exposure to infectious stages on trematode infection intensity and success in mussels

Possible impacts of zoosporic parasites in diseases of commercially important marine mollusc species: part I. Perkinsozoa

The phylum Perkinsozoa includes well-known parasites of commercially important species of molluscs in aquaculture, such as Perkinsus marinus, a virulent pathogen of the eastern oyster, Crassostrea virginica, and in wild populations in many marine ecosystems throughout the world. These parasites are responsible for significant losses in aquaculture production. For this reason, much research has already … Continue reading Possible impacts of zoosporic parasites in diseases of commercially important marine mollusc species: part I. Perkinsozoa

Parasites and pathological conditions in the edible oyster, Crassostrea madrasensis (Preston), from the east and west coasts of India

A detailed pathological survey was carried out on the commercially important edible oyster, Crassostrea madrasensis (Preston), from two distinct coastal/brackish water ecosystems of south India. Samples were collected twice a year during wet and dry seasons from 2009 to 2012. Bacterial colonies in the form of prokaryotic inclusions, protozoans (Perkinsus beihaiensis, Nematopsis sp. and ciliates … Continue reading Parasites and pathological conditions in the edible oyster, Crassostrea madrasensis (Preston), from the east and west coasts of India

Parasite threatens Bluff oyster population

There are fears a parasite discovered on two Oyster farms near Stewart Island could spread to the wild Bluff Oysters growing in Foveaux Strait. An emergency meeting was held in Wellington on Wednesday to develop a plan to stop that happening, and protect the delicacy. Bluff Community Board Chairman Ray Fife says "There is potential … Continue reading Parasite threatens Bluff oyster population