I like to fish for "happy" fish. In the fall when the water is clear there are some areas in the Bay where you can see the bottom in ten feet of water. You can see fish on structure and they are obviously feeling frisky and "happy." In this type of environment they take your lure or fly with enthusiasm, they are simply "happy." If you release them they quickly scoot back to their temporary homes no worse for the experience.
However in the warmer months of the summer. You can see fish on your sonar huddled in the top five to fifteen feet water in holes more than 30 feet deep. They are there because it's the only depth where the dissolved oxygen is sufficient for them to survive. All depths below that are essentially "dead zones" due to nitrogen pollution. Even when fish are in the upper tier of the water column, it is obvious that they are stressed out by how slow they move and respond to various fishing tactics.
Fishing in or around polluted water is not a good experience in terms of visual enjoyment or quality of results. Wether you take out a new angler or someone who fishes a lot, they enjoy the "happy" fish experience much more than the stressed fish experience.
--Ed Liccione, Queenstown, MD