Limitations of feed-fed LMB may not be just a function of learning curve. The physiology / morphology may need to change as well. Latter may take more than a few weeks..
What are your observations as to morphology?
Should be easy to find publications supporting morphological changes of sunfish as a function of prey type. From what I have seen, it is likely the changes to LMB are likely to be just as pronounced.
I know of one on OSS. I haven't read it but had assumed these morphological changes occur over a few generations. I suppose also that offspring of varying morphology are always in the population, those with morphology best suited for the most abundant prey have more reproductive success and quickly dominate.
Nobody has mentioned the impact of artificial selection at hatcheries with respect to feed training. At least some hatcheries, perhaps most by now, feed brooders prepared feed.
While epigenetic effects would likely subside after a generation or two, one has to wonder what they might be.
