As hunting regulations were enacted, law enforcement personnel hired, game refuges established and restocking started, the deer population gradually was reestablished.
A survey in 1982 found gudgeon, minnow and three-spined stickleback, which had increased by 1985, and over 10,000 coarse fish were released as part of a restocking programme.
It increased again by 2010 due to rebound in consumption following the 200809 world economic crisis, restocking and continued growth in consumption in the world's developing economies.
Despite the steady improvement in water quality, restocking of the river with fish, attempted on several occasions between 1981 and 1994, was largely ineffective, caused by intermittent discharges of pollutants.
The game allows the player to control various aspects of running a business including picking which products to sell, hiring and firing employees, crafting goods, and restocking shelves.