I’ve found that the nibbles help most of the time. We tried them by one of us fishing with the nibbles and the other didn't, we both used the same type, size, and color of jigs. Then we switched off, to remove any other variable. We found that the one using nibbles caught more fish. We did this a few different times and seasons, the only time the catch was close to the same, was during the spawn and it seemed to change from day to day even then. We both use the nibbles all the time. During the spawn though we will start with nibbles and then after the first fish we stop using them if we still are catching a lot of fish we save the nibbles, but if a few cast go by with out a catch we put the nibbles back on. They do defiantly help.
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may your livewells stay full, and your rods stay bent.
Kevin