He’s talking about skinny fish, JC:
In reply to:
Al Stevens, assistant area supervisor at Lake City and a large lake specialist for Lake Pepin, says assessments going back to 1965 show that walleyes love high water.
“Over the years we’ve seen a lot of ups and downs in the walleye population,” Stevens says. “What shows up all the time is that water levels are very important. The relationship for walleyes is that they generally produce better year classes [generations of fish born during the same years] in years of high water.”
Goes on to say:
In reply to:
And floods don’t benefit all fish. The strongest year classes of smallmouth bass, for example, seem to come during years of low river water. Bluegills and crappies seem to thrive in stable water levels.
Link
I’m guessing you could call Lake City management station and get specifics. The article doesn’t supply raw data.