FWIW...I stocked 10 NP in my 1/4 pond last year. This little body of water had BCP,BG,YB and BH before the NP went in. As soon as the ice comes off (some time in April) and I can get a trap in the water or hook and line, we are going to catch and cut open as many of the 10 pike as we can catch.
Its such a small body of water not sure what can learned but we will see if there are any trends.
I think you would have more reliable results if you waited until 2-4 weeks after ice-out when they are feeding actively.
How big were the NP that you stocked? If they are old enough they will make an effort at a spawn immediately at ice-out so that will affect the results early on.
If you give them a chance to "get going metabolismly speaking", I predict that they will have BCP,BG,YP and BH in their stomachs.
