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Status and restoration of native oysters in Galway Bay 2018-2023: Final report January 2023 to the Marine Institute
Tully, Oliver White, Emma Kelly, Diarmuid O' Halloran, Gerry Chopin, Nicolas Daly, Patricia
Tully, Oliver
White, Emma
Kelly, Diarmuid
O' Halloran, Gerry
Chopin, Nicolas
Daly, Patricia
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Date
2024
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Marine Institute
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Abstract
The status of native oyster populations in Galway Bay, and other areas in Ireland and Europe, has
declined in recent decades. Since 2017, supported by the European Maritime and Fisheries Fund and
the Irish Government, various projects have been undertaken to identify pathways to restoration. A
number of projects to characterize the distribution and abundance of oysters in Galway Bay and post
settlement growth and survival have been completed. Spat have been produced on shell (cultch) in
spatting ponds for distribution to enclosures and to the seabed. Small and large scale trials to
increase shell cover and spat fall in fishery order areas have been completed. Data on the prevalence
and intensity of infection of oysters with the parasite Bonamia ostrea since the 1980s have been
compiled and new data collected. The effects of temperature and salinity on oyster survival and
feeding rates were estimated and used to identify areas of the Bay that posed high risk to oysters by
combining results with a high resolution hydrodynamic model. These projects are described in this report
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Tully, O., White, E., Kelly, D., O'Halloran, G., Chopin, N., & Daly, P. (2023). Status and restoration of native oysters in Galway Bay 2018-2023: Final report January 2023 to the Marine Institute. EMFF 2014-2020 Marine Institute Report Series, Marine Institute