Factors influencing in vitro killing of bacteria by hemocytes of the Eastern oyster (Crassostrea virginica)

Article Abstract:

A study was conducted to provide a comprehensive analyses of the colonization potential of specific bacteria in oysters. It has been discovered that oyster hemocytes are capable to killing bacteria. Mammalian systems employ certain strategies that inhibit phagocytosis, including avoiding contact with phagocytes, inhibition of engulfment and survival within the phagocytes. Certain differences exist between bacterial generations that determine their ability to evade oyster hemocyte bacticidal activity.

Bacteria, Bacteriology, Blood cells

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Bioencapsulation of two different Vibrio species in nauplii of the brine shrimp (Artemia franciscana)

Article Abstract:

The bioencapsulation of two different Vibrio species in Artemia franciscana nauplii was described. Artemia franciscana cysts were utilized and their corion was chemically removed by decapsulation. The bacterium HL57 was isolated from the hemolymph of a diseased juvenile brine shrimp and subsequently characterized. Results showed that the efficiency of Artemia franciscana nauplii in bioencapsulating bacteria largely depends on the type of bacteria, its status and time of exposure.

Food and nutrition, Vibrio, Artemia, Brine shrimps

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Potential role of the Eastern oyster, Crassostrea virginica, in the epidemiology of Cryptosporidium parvum

Article Abstract:

The ability of Cryptosporidium parvum oocysts to infect Crassostrea virginica oysters was analyzed in aquarium experiments containing 240 cultured Eastern oysters. Histological analysis and immunofluorescence microscopy of specimens exposed to Crassostrea virginica indicated the presence of oocysts in the gill washings, hemocytes and intestines of the oysters. Furthermore, the oocysts from the hemocytes were able to infect other oysters.

Analysis, Coccidia, Cryptosporidium

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