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Your right, just not being fished commercially is not enough to make populations explode. However the effect of not being commercially fished while all of their competative species are being commercially fished, and many would say overfished, would increase the effect. I don't see how just opening up dog fish to commercial fisherman is going to decrease their numbers significantly though so why not do it if there is a market for them. I assume that the market is pretty small and the price pretty low so I don't really think alot of people will see it worth while to target them anyways.
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