Three of Brisbane's foreshores are now open to dogs to run freely, after a year-long trial of three off-leash areas began on the weekend.

The three foreshore areas at Sandgate, Nudgee Beach and Manly will be open for the trial after the state government developed guidelines on opening up dog off-leash areas in marine parks.

The proposed dog off-leash area at Sandgate in Brisbane's north.

The state had commissioned research from the University of Queensland about the potential impacts on migratory birds and how to protect them, to develop draft guidelines and asked Brisbane City Council to run the trial.

About 40,000 migratory birds visit the Moreton Bay area in spring and summer, flying from Asia and as far north as Siberia.