Never say never.
We have had years in the past (2007 was a good example) when the trawl reports were poor, yet once the 1-2 year old walleye began to show up in 08 and 09 trawls and angler reports, the 07 hatch report was corrected upwards.
Remember, this is an 'estimate' of the hatch----many variables (food abundance and location, wind, waves, currents, water temperature, oxygen levels) can impact if YOY walleye will be at those standard trawl sites every year at a given time.
And it's the best estimate we have----sometimes it may be slightly off to the left or right, other times (2007) it can be way off, and sometimes it can be right on the money.
None the less, the data is collected/compiled by our fishery management professionals on our side of the lake and from our management partners to the north with the best scientific knowledge that exists. Trust their knowledge and expertise in managing this great resource.
Bottom line--it is what it is-----
We still have the greatest walleye fishery in the world.
Dave Kelch, Ohio Sea Grant Extension Specialist, Ohio Sea Grant College Program