|The Fisheries Management staff from Areas 1 and 2 along with students from Clarion University
returned to Kahle
Lake in early October of 2007 to perform our annual assessment of the lake’s largemouth bass population.
We followed our standard procedures for a mark-recapture population estimate by night electrofishing the entire shoreline and measuring and marking all bass captured on the evenings of October 9 and 10, 2007. All fish were released to redistribute themselves throughout the lake. The entire shoreline was night electrofished again on the evening of October 15, 2007 and all bass captured were again measured and any marked fish were recorded. See Table 1 for the numbers of fish marked and recaptured.
Table 1. Mark-Recapture numbers from Petersen Population Estimate of Largemouth Bass
in Kahle Lake, October 2007.
Putting the numbers from Table 1 into the Chapman modified Petersen population estimate formula yields the estimated population of largemouth bass in Kahle Lake presented in Table 2.
Another useful method of comparing largemouth bass between different years at Kahle Lake and comparing Kahle Lake to other Area 2 reservoirs is Catch per Hour (CPH) of electrofishing. As you can see in Table 3, most of the fluctuations in total Catch per Hour can be attributed to variations in the number of smaller bass, 2 to 11 inches, while Catches per Hour for bass greater than 12 inches have remained fairly stable. Big Bass Regulations have done a good job protecting bass between 12 and 15 inches, which also allows some bass to survive beyond the 15 inch minimum size limit. The numbers of 2 to 5 inch bass show that Kahle Lake has had three consecutive years of good spawning success.
While the largemouth bass, through Big Bass Regulations, are providing an excellent fishery, they are also providing an even more valuable service to Kahle Lake panfish anglers. This high-density bass population is doing an excellent job of preying on small panfish, thereby reducing their density and reducing competition for food resources, which prevents slow panfish growth rates. Our trapnets this past spring showed that quality size black crappie and bluegill have never been better in Kahle Lake and that yellow perch are gradually improving back to historic levels.
Table 3. Size distribution and Catch Per Hour (CPH) statistics for largemouth bass captured by night-electrofishing in Kahle Lake.
|-- Tim Wilson, Area 2 Fisheries Biologist|
|Commonwealth of Pennsylvania Web Privacy and Security Policies|