If an adaptation can happen so relatively quick, then I wonder if a fish could adapt to the forage base if it was an 'unnatural' pairing.

For example, if YOY SMB were introduced into a Bluegill only pond, could the SMB adapt to be able to thrive in that ecosystem?

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."