The memory helps the fish find its way back to the mouth of its home river, and from there it uses chemical cues to locate its birth stream.

BBC: Sockeye salmon 'sense magnetic field of home'

My next memory involves being at the bottom of a Costa Rican river wondering which direction was up and holding my breath while I waited for my life-preserver to sort things out which it did.

WSJ: Dilbert Creator Scott Adams's Year Without Fear