Hi I have often wached spawned out steelhead drifting downstream with their heads into the current.They arnt of course swimming they are simply conserving energy and allowing the current to drift them.
Periodicly they will rest behind rocks and will feed to replace theyr energy.This is the so called mending process. Depending on the abumdance of feed in the river they may spend some time gradually working downstream and mending.
These so called slinks or snakes are voratious feeders and will chase and strike at lures which resemble food They are hard fighters but are of cours useless as a food fish.
Lures such as stonefly larvae, deer mice immitations and salmon fry immitations are effective for slinks
coot