Two adults and one child were treated by paramedics after a boating collision near Port Victoria on Yorke Peninsula.
The crash happened in the morning around 10am approximately 10km offshore.
Four people were aboard one boat while only one on the other, when the two coliided.
A 35-year-old woman was treated for minor chest and head related injuries, while an 11-year-old boy and a man aged 67, are suffering shock.