Thats when theyll examine fish for weight, length and age and determine by the number of fish they catch in their sample and the health of fish whether or not a change has taken place.
Lawrence Dorsey of Albemarle, a Commission biologist whose territory includes most of the lakes southeastern shoreline, said that short-term improvements in a fishery can be caused by any number of factors, but a series of excellent spawns and year-classes of fish is usually one of the keys.
"Its very difficult to isolate one thing that causes something a change in a fishery," Dorsey said. "You can examine a number of different factors; weve tried to do that. Weve measured things like water flow through a reservoir to see if theres any bearing. Its just hard to say that one thing caused any change."
Dorsey said that anecdotal reports from fishermen at Lake Wylie, which is two impoundments downstream from Lake Norman, about a similar change in the crappie fishery. "You heard about Wylie that nobody caught many fish, but the ones that caught were nice ones," he said. "Now, were hearing that fishermen are catching much better numbers of fish. Maybe its the same thing.