Large tench may be found in gravel pits or deep, slow-moving waters with a clayey or silty bottom and lots of aquatic vegetation. They take a variety of baits but are "nibblers" and can be difficult to hook.
Had a few tench in the fish-in 10 in total, 2x8lbers, 2x7lbers, 4x6lbers and smaller. Great fishing with good friends. http://www.kpanglingguide.com/blog/