I think trying the seine is a good idea, at least you'll have an idea of what's really down there, or not.

As far as restocking goes, if it were me, I would find out where the original fish went before I put in any more.

Try the seine, or a trap, or fyke net.(or all three).

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.