What do you mean nothing backing up claims regarding bends? Barotrauma as it is better known as is well documented and fairly straight forward.
The use of descending devices in the situation of mistakenly catching a fish in deep water is a good procedure. However the use of a descending device as an excuse to fish deeper water is imo irresponsible as although it does increase the fishes chance of survival there can be permanent damage done.
For perch and walleye you should fish shallower than 30 fow unless you plan on keeping everything(which isn't possible here for walleye, but is for perch).
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