Depending on what state you live in and the depth of water that the bamboo tops are in that will tell allot about why the fish aren't there. Here in East Texas we are getting rain showers every few days. The crappie are suspending at 6 feet deep and really just roaming the lake and feeding on schooling shad. The bamboo will be most effective when the fish are holding in the depth that your tops are located in. When the fish move deeper as the water warms and the oxygen supply shallow dwindles the tops will hold many more fish.