Document Type

Article

Department/Program

Virginia Institute of Marine Science

Publication Date

1999

Journal

Journal Of Shellfish Research

Volume

18

Issue

2

First Page

465

Last Page

473

Abstract

To evaluate and compare the performance of triploid juvenile C. gigas (mean shell height = 19.2 mm) and triploid juvenile Crassostrea virginica (mean shell height = 31.7 mm), 600 oysters of each species were deployed for 1 year in floating mesh cages at three replicate sites within low, medium, and high salinity regimes (respectively,25%) in the Chesapeake Bay and the Atlantic Coast of Virginia. The comparative performance of the two oyster species varied with salinity. At low salinity sites, cumulative mortality of C. virginica (10%) was significantly (P < .05) lower than that of C. gigas (63%), and over-all mean growth rate of C. virginica (2.9 mm mo(-1)) was significantly (P < .05) higher than that of C. gigas (1.6 mm mo(-1)). At medium salinity sites, survival and growth rate of C. virginica and C. gigas were nor significantly (P > .05) different. Both species experienced moderately high cumulative mortality at the medium salinity sites-35% for C. virginica and 53% for C. gigas-but considerable variation among sires was observed. Ar high salinity sites, mean cumulative mortality was similarly low (

Keywords

Crassostrea Gigas; Triploid; Growth; Survival; Disease Susceptibility; Virginia

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