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Epizootiology of diseases of oysters(Crassostrea virginica), and parasites of associated organisms in eastern North America

Abstract

Haplosporidan parasites of oysters have been reported from four continents. Those of the generalMinchinia, Haplosporidium, andMarteilia, which cause serious diseases of oysters, have been intensively studied. Epizootiology of these highly pathogenic species is well known. Life cycles are obscure for all haplosporidans because artificial infections have not been achieved. The high pathogenicity of newly-discovered haplosporidan diseases to native oysters in eastern North America and western Europe may indicate that these are exotic pathogens parasitizing susceptible oysters not previously exposed to these disease agents. Epizootiology of two haplosporidan pathogens along the middle Atlantic Coast of North America during 25 years of disease activity is discussed.Haplosporidium nelsoni sporulates only rarely and its life cycle remains unconfirmed. Resistant oysters were developed in nature and from laboratory breeding.Haplosporidium costale which causes “Seaside Disease” in high-salinity waters appears to be a more acclimated disease with regular patterns of infection and mortality. Several minor parasites whose life cycles and host species need more study are mentioned.

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Contribution No. 1147. Virginia Institute of Marine Science; Gloucester Point, Virginia 23062

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Andrews, J.D. Epizootiology of diseases of oysters(Crassostrea virginica), and parasites of associated organisms in eastern North America. Helgolander Meeresunters 37, 149–166 (1984). https://doi.org/10.1007/BF01989300

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