Crappie during the spawning period by fly fishermen, and can be taken from frozen ponds and lakes in winter by ice fishing. Before state fisheries departments began to implement more restrictive, conservation-minded regulations, a great number of crappies, especially in the Mississippi River states, were harvested commercially in the 19th and early 20th centuries. At one point the annual crappie catch sold at fish markets in the United States was reported to be approximately three million pounds. A commercial fishery for crappies existed at Reelfoot Lake in Tennessee until 2003. It was one of the few commercial fisheries for crappies in
3D Virtual Creature Evolution (from zero, as not having an influence on fitness, to one, or having maximum influence) to determine the fitness goal. What generations the fitness function applies to can also be set. The environment, or “Terrain”, is then determined. This includes a flat plain, bumpy terrain (in which a hill is generated around creature that constantly inclines as distance is traveled from the creature’s spawning point), water (a low gravity simulator, non-functional), and “spheres” (spheres are generated above creature to catch). Everything in the simulation is viewed from a first person viewpoint. After settings are determined, the first generation is generated