Pathogens of marine bivalves in Maine (USA): A historical perspective

Shellfish aquaculture (in particular oyster cultivation) has the potential to play a significant role in refreshing the coastal economy in the state of Maine (USA). Although ocean warming and acidification are often listed as the primary manifestations of climate change in the marine environment, the issue of expanding geographic ranges of parasites and pathogens is … Continue reading Pathogens of marine bivalves in Maine (USA): A historical perspective

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Genetic variation in anti-parasite behavior in oysters

Behavioral avoidance of disease-causing parasites provides a first line of defense against the threat of infection. We report that the suspension-feeding oysters Crassostrea virginica respond to the presence of the water-borne parasite Perkinsus marinus by increasing the rate of shell closure and decreasing the clearance of suspended particles from the surrounding seawater. The extent of … Continue reading Genetic variation in anti-parasite behavior in oysters

Long-term affected flat oyster (Ostrea edulis) haemocytes show differential gene expression profiles from naïve oysters in response to Bonamia ostreae

European flat oyster (Ostrea edulis) production has suffered a severe decline due to bonamiosis. The responsible parasite enters in oyster haemocytes, causing an acute inflammatory response frequently leading to death. We used an immune-enriched oligo-microarray to understand the haemocyte response to Bonamia ostreae by comparing expression profiles between naïve (NS) and long-term affected (AS) populations … Continue reading Long-term affected flat oyster (Ostrea edulis) haemocytes show differential gene expression profiles from naïve oysters in response to Bonamia ostreae

Identification of a newly described OsHV-1 µvar from the North Adriatic Sea (Italy)

The surveillance activities for abnormal bivalve mortality events in Italy include the diagnosis of ostreid herpesvirus type 1 (OsHV-1) in symptomatic oysters. OsHV-1-positive oysters (Crassostrea gigas) were used as a source for in vivo virus propagation and a virus-rich sample was selected to perform shotgun sequencing based on Illumina technology. Starting from this unpurified supernatant … Continue reading Identification of a newly described OsHV-1 µvar from the North Adriatic Sea (Italy)

Real-time quantitative isothermal detection of Ostreid herpesvirus-1 DNA in Scapharca subcrenata using recombinase polymerase amplification

Ostreid herpesvirus-1 (OsHV-1) is a well-known pathogen associated with high mortality rates in hatchery-reared larvae and juveniles of different bivalve species worldwide. Early, rapid and accurate diagnosis plays a fundamental role in disease prevention and control in aquaculture. Recombinase polymerase amplification (RPA) is a novel isothermal amplification method, which can amplify detectable amount of DNA … Continue reading Real-time quantitative isothermal detection of Ostreid herpesvirus-1 DNA in Scapharca subcrenata using recombinase polymerase amplification

Molecular characterization of complement component 3 (C3) in Mytilus coruscus improves our understanding of bivalve complement system

Complement component 3 (C3) plays a central role in the complement system whose activation is essential for all the important functions performed by this system. Here, a novel C3 gene, termed Mc-C3, was identified from thick shell mussel (Mytilus coruscus). The deduced Mc-C3 protein possessed the characteristic structure features present in its homologs and contained … Continue reading Molecular characterization of complement component 3 (C3) in Mytilus coruscus improves our understanding of bivalve complement system

Impacts of predators, habitat, recruitment, and disease on soft-shell clams Mya arenaria and stout razor clams Tagelus plebeius in Chesapeake Bay

Soft-shell clams, Mya arenaria, and razor clams, Tagelus plebeius, in Chesapeake Bay have declined since the 1970s, with severe declines since the 1990s. These declines are likely caused by multiple factors including warming, predation, habitat loss, recruitment limitation, disease, and harvesting. A bivalve survey in Chesapeake Bay examined influential factors on bivalve populations, focusing on … Continue reading Impacts of predators, habitat, recruitment, and disease on soft-shell clams Mya arenaria and stout razor clams Tagelus plebeius in Chesapeake Bay