Document Type

Article

Department/Program

Virginia Institute of Marine Science

Publication Date

1991

Journal

Journal of Shellfish Research

Volume

10

Issue

2

First Page

379

Last Page

388

Abstract

The Chesapeake Bay oyster fishery for Crassostrea virginica (Gmelin) is in a state of continuing decline. Two diseases, Haplosporidium nelsoni and Perkinsus marinus have effectively eliminated oysters from many sections of the Bay. Despite over 30 years of disease activity the native oysters have developed neither tolerance nor absolute resistance to these diseases, and do not exhibit any recovery in disease endemic areas in Virginia. Repletion programs have completely failed to recover to permanent production areas lost to disease. Present fishery management activities are limited to a controlled retreat away from the disease in an arena where disease distribution is salinity and temperature (and hence climate) related and, therefore, beyond human influence. Disease resistance is the pivotal issue. This commentary builds on the reality that without resistance to both diseases no recovery to sustained, stable production on all formerly productive oyster bottom is possible. It is improbable that such resistance can be developed in Crassostrea virginica. A consideration is made of the case for introduction of a non-endemic species, Crassostrea gigas (Thunberg) to assist in attaining this goal.

Keywords

Crassostrea gigas, oyster, introductions

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