The Renfrew OPP along with the Underwater Search and Recovery Unit are scouring the Ottawa River and its banks after a man went missing over the weekend.
Two men were duck hunting in Horton Township on Saturday night when their boat capsized around 7:30 p.m.
One man was able to swim to a nearby island and was discovered on Sunday morning and taken to hospital.
The missing 36-year-old man was last seen swimming toward the shore.
Neither of the duck hunters were wearing a life jacket.