OK, say a "no fishing zone " is established in an area to protect ground fish, say this area has a depth of 200 or 300ft. If the purpose of the closure is to inhance the groundfish then whats wrong with fishing the remaining water column ?
Also, let's not loose site of the fact that these closures are not only directed at the recreational fisherman, the commercial guys will be affected as well.
We all want more, bigger fish so the idea may be a sound one, just to vague. We need much more info before anybody can make a reasonable assessment of any proposals where closure is being considered.