Free images results:
 

Trout pictures, stock photos and images

 
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I'm hooked! Stock Photography
Author: Crp
Hooked! Royalty Free Stock Image
Author: Crp
Bobber Royalty Free Stock Photos
Author: Rbouwman
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Trout fish Royalty Free Stock Photography
Author: Andart
Trout Royalty Free Stock Photography
Author: Rachosley