Bocomo, I agree with the PSD but my comment above (top) was maybe a bit shallow beings I didn't say why I was asking for WR's..
Simply put, I deal with this data all the time and my way of addressing this was to determine the size that showed up with low WR's, then form a plan based on forage present.
I think we have the same end result, just a different way of getting the answer.
Some may want to jump right in to the scientific explanation but in this case it seemed appropriate to get more answers first.
In this case beings the OP said 98% were less than 1/2 lb. with only 1-2 fish caught any bigger, we can speculate all day long but we both know there are several things missing or out of whack.
I just didn't choose to go the tech meister route right out of the gate.