Haplosporidia

Haplosporidian species (phylum Haplosporidia Caullery & Mesnil, 1899) are a small group of four genera of sometimes pathogenic protozoan parasites usually with uninucleated spores. They are widely distributed in marine and freshwater invertebrates, although their status in Africa, much of Eurasia and Central and South America, is largely unknown. They infect molluscs including commercially important … Continue reading Haplosporidia

The oyster immunity

Oysters, the common name for a number of different bivalve molluscs, are the worldwide aquaculture species and also play vital roles in the function of ecosystem. As invertebrate, oysters have evolved an integrated, highly complex innate immune system to recognize and eliminate various invaders via an array of orchestrated immune reactions, such as immune recognition, … Continue reading The oyster immunity

Diagnosis and Control of Diseases of Fish and Shellfish

There has been a continual expansion in aquaculture, such that total production is fast approaching that of wild-caught fisheries. Yet the expansion is marred by continued problems of disease. New pathogens emerge, and others become associated with new conditions. Some of these pathogens become well established, and develop into major killers of aquatic species. Diagnosis … Continue reading Diagnosis and Control of Diseases of Fish and Shellfish

Mass selection for survival and resistance to OsHV-1 infection in Crassostrea gigas spat in field conditions: response to selection after four generations

The ostreid herpesvirus 1 (OsHV-1) is one of the major pathogens affecting the Pacific oyster Crassostrea gigas, and numerous mortality outbreaks have been observed worldwide. We report the first results of our experimental breeding program using mass selection focused on survival and resistance to OsHV-1 after four generations of selection for two lines. These lines … Continue reading Mass selection for survival and resistance to OsHV-1 infection in Crassostrea gigas spat in field conditions: response to selection after four generations

Seasonal variation of transcriptomic and biochemical parameters of cockles (Cerastoderma edule) related to their infection by trematode parasites

Bivalve populations are controlled by several biotic and abiotic factors. Parasitism is among the biotic factors but is often neglected. In the present study, we focused on the transcriptomic and biochemical responses of Cerastoderma edule when parasitized as first intermediate host by the trematode Bucephalus minimus (sporocyst, the most damaging stage), and taking into account … Continue reading Seasonal variation of transcriptomic and biochemical parameters of cockles (Cerastoderma edule) related to their infection by trematode parasites

Flat oyster parasite found at Stewart Island

Cawthron Institute scientists are well-placed to respond to the discovery of Bonamia ostreae at oyster farms on Stewart Island. Bonamia ostreae is a parasite that poses substantial threat to flat oysters, and this afternoon the Ministry of Primary Industries (MPI) confirmed they have detected it at two Stewart Island farms. Cawthron Institute Aquaculture Group Manager, … Continue reading Flat oyster parasite found at Stewart Island

Ancient DNA analysis identifies marine mollusc shells as new metagenomic archives of the past

Marine mollusc shells enclose a wealth of information on coastal organisms and their environment. Their life history traits as well as (palaeo-) environmental conditions, including temperature, food availability, salinity and pollution, can be traced through the analysis of their shell (micro-) structure and biogeochemical composition. Adding to this list, the DNA entrapped in shell carbonate … Continue reading Ancient DNA analysis identifies marine mollusc shells as new metagenomic archives of the past