Thing is this, you get rid of a blockage and fish will utilize almost immediately but they are fish already existing in the available habitat. So they use the newly available habitat, both juveniles and adults, and will prosper to some degree with a higher survival but it does not mean substantial numbers of additional adults because you have to STOP KILLING THE ADULTS to get more spawners. Habitat work is the thing most beneficial to fish but it has to be linked with super glue to harvest reform. If that does not happen it is simply a very expensive feel good exercise in futility.

Doc has it right !