Lake Robertson - News & Reports
Fish habitat manipulation is a common tool used by biologists to improve fishing. At Lake Robertson, aquatic weed control is very important. Too many weeds impede fishing and too few weeds expose young fish populations to overpredation. Triploid grass carp have been stocked periodically to help control weeds. Fertilization was tried through the 1980's and was somewhat successful. In the future, biologists will spot treat nuisance water weeds with chemicals in order to maintain a balance of weeds and fishing space. One of the main water weeds, curleyleaf pondweed, comes on strong in May, but usually dies back by mid-June. Winter drawdown of the lake also helps control water weeds.
Also, as far as other fish habitat improvement goes, red cedars have been cut locally and sunk in piles at different locations around the lake. Culled evergreens from a Christmas tree operation have been deployed as well. These tree shelters attract baitfish, and hence larger fish for anglers to target. Biologists have also dropped hardwood trees from the bank into the lake with chainsaws. These "hinge trees" create a great deal of structure with both the crown and the trunk.
Another fish manager's tool, stocking, has been employed frequently at Lake Robertson. In order to maintain good stocks of channel catfish and walleye, both species must be stocked annually. Adult channel catfish are usually stocked in the fall and fingerling walleye are released in the spring. Walleye stocking was recently increased in order to bolster future adult stocks of this great game fish. Also, as mentioned previously, redear sunfish were stocked in 2001.