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Caged Crassostrea ariakensis Deployment in Chesapeake Bay: Growth, Disease and Mortality

Caged Crassostrea ariakensis Deployment in Chesapeake Bay: Growth, Disease and Mortality. Kennedy T. Paynter, Jacob Goodwin , Marcy Chen University of Maryland, College Park Donald Meritt University of Maryland Center of Environmental Science Stan Allen Virginia Institute of Marine Science.

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Caged Crassostrea ariakensis Deployment in Chesapeake Bay: Growth, Disease and Mortality

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  1. Caged Crassostrea ariakensisDeployment in Chesapeake Bay: Growth, Disease and Mortality Kennedy T. Paynter, Jacob Goodwin, Marcy Chen University of Maryland, College Park Donald Meritt University of Maryland Center of Environmental Science Stan Allen Virginia Institute of Marine Science

  2. Previous Observations • Calvo et al., • C. ariakensis grew much faster than C. virginica • C.a. experienced much lower mortality due to disease • Grabowski et al., • C.a. grew faster than C.v. in intermediate to high salinities but did not grow well in low salinities. • However both studies, • Compared diploid C.v. to triploid C.a. • Did not compare specific parasite free (SPF) C.a. toSPF C.v.

  3. Experimental Design • Md sites - Severn, Patuxent, Choptank Rivers • Va site - York River • Deployed April 2004 • 1300 individuals of each species - • Both triploid • 400 in each of two ADPI bags - sample • 250 in each of ADPI “reef” trays - left alone • Monitored monthly since deployment • Size, mortality, P. marinus prevalence

  4. Site Locations Severn River Choptank River Patuxent River York River

  5. 6 psu

  6. 9 psu

  7. 11 psu

  8. 17 psu

  9. C. virginica C. ariakensis Approximately 200 of each species

  10. Perkinsus marinus In addition to growth, the difference in disease susceptibility between native and non-native oysters is important in considering an introduction

  11. Mortality since deployment

  12. Summary • C. ariakensis grew much faster in higher salinities but only slightly faster in lower salinity waters in Maryland. • C. ariakensis acquired lower dermo prevalence. • Mortality in both species was low and similar, however, dermo infections remained light during this portion of the study and heavy disease-related mortalities appear likely in C.v. in the near future.

  13. York River Spat Settlement in 2004 A. B. C. virginica C. ariakensis 2.3 spat/oyster 0.4 spat/oyster Spat settlement on C. virginica (A) and C. ariakensis (B). Spat were found in significantly higher numbers in C. ariakensis (ANOVA; P<0.02).

  14. Additional Observations There were differences in Polydora sp. infestations (See poster A6. Ward) Hypoxia tolerance varied between C. ariakensis and C. virginica (See poster A4. Harlan)

  15. Acknowledgements • Funding from Maryland Sea Grant, NOAA, and Maryland Department of Natural Resources. • Technical assistance from, Mark Sherman Steve Allen,, Tim Koles, Nancy Ward, Terra Lederhouse, Nicole Harlan, Paul Miller, Kennedy and Rick Paynter.

  16. Spat Settlement • York River was the only site with spatfall in 2004 • Spat were found in significantly higher numbers in C. ariakensis (ANOVA: P<0.02)

  17. Mortality Table Comparisons

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