Well the obvious start would be fishing around the cages! Escapees will find comfort in sticking with their captive mates and will feed on any pellets that make their way through the cage uneaten. The trout will sit underneath the cages so just go round them few times with a sinking line.
Next Id look for any inlets. The sound of running water will attract any breeding fish to the area. Gravel bars will have the same effect.
Once Id covered these areas Id go and find weed beds and other types of structure. If weed beds are not obvious, look for coots and duck etc, they will generally feed near these areas.
If all else fails, start doing drifts along all the edges. If that doesnt work, do a couple of drifts through the deeper water. The more likely water that you cover, the more chance you will have of finding wish.
Around the steel no tortur'd worm shall twine, No blood of living insect stain my line;
Let me, less cruel, cast feather'd hook, With pliant rod athwart the pebbled brook,
Silent along the mazy margin stray, And with fur-wrought fly delude the prey
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