Yes, however, there could be other causes too, or at least 'ripple effects.'
For example, some of your bluegill are eating that feed too, most likely, and if so, then those bluegill may pull off more abundant spawns, thus recruiting more Young Of the Year (YOY) bluegill. Some of those YOY may grow beyond easy predation by some of the LMB population.
Simply put, if you didn't feed the LMB, they would probably eat more young bluegill and bass.
On the flip side, you could probably achieve more growth in all species of fish by using feed vs. not using feed.
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