Trout - please explain

[Mtn Hunter]

My dad was cleaning a trout the other day and found these small rocks in it's stomach. Can someone explain to me why this trout would have swallowed these rocks? We've never seen this before.

 

[RUGER]

Very interesting.
Total guess but I would say it got them while snatching something else off the bottom.

How big was the trout?
Rainbow, brown or what?

 

[RUGER]

Did a quick search and this is actually kinda common apparently.
General consensus is they get them while eating other things.

 

[Mike Belt]

Flip a few rocks over in a trout stream and you'll find the nymphs or larva they're eating. In the process I'm sure ingesting a few pebbles is common.

 

[WTM]

glad im not a trout. id hate to pass those, lol.

 

[7mm08]

Probably he fished in a tailwater ( river below dam) and trout eat the freshwater snails which are abundant. I think the trout needs bifocals!!