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Native Oysters

In the 1800s, European native oysters from Lough Foyle and Carlingford were exported in large numbers to markets mainly in England. The earliest record shows that Lough Foyle oysters were being sent via steamship to Liverpool as far back as 1832.

Overfishing, disease, pollution and habitat loss have caused stocks to decline dramatically throughout Europe. In many areas, oyster populations became extinct.

Today, Lough Foyle continues to support a traditional wild fishery and one of the last remaining populations of European native oysters. The fishery lands between 100 and 200 tonnes every year. Most of these are exported to continental Europe.

Lough Foyle’s native oyster population is important locally and internationally, economically and environmentally. Careful management is needed to sustain the fishery, protect the environment and, where possible, enhance the oyster population.

Government agencies and fishermen’s organisations have compiled many studies and reports about the fishery. They agree on calls for effective regulation to prevent overfishing and protect the oyster beds and stocks.

Loughs Agency has managed and regulated the fishery since 2008. We use a whole ecosystem approach which takes the entire marine environment, including habitat and non-commercial species, into account.

We carry out surveys every autumn and spring. Their results, together with information from the spawning assessment, help to inform management decisions

The dredge survey produces data on oyster numbers, length, weight and mortality, and spat, or juvenile oyster, settlement.

The data is used to indicate the number of oysters above the 80mm minimum landing size which may be available to harvest. It allows us to take a precautionary approach to management and ensures that an effective spawning stock is maintained.

The blood parasite Bonamia ostreae has caused a widespread loss of native oyster fisheries around Europe in the last 40 years. It was first detected among Foyle oysters in 2005 and has only recently begun to cause mortality in our stocks.

Loughs Agency carries out regular sampling to monitor this disease. The infection level remains  low and stable. Fishery regulations allow us to close beds to fishing activity, if necessary.

COVID-19 UPDATE

Following the Government’s advice in relation to COVID-19, Loughs Agency has put in place a number of measures to maximise our capacity to continue to deliver our services as best we can.