I live in PWC but work in Alexandria.
I'd say very messy. I'm guessing 25% to 40% was getting expelled through his gills. But I took care of that by dehydrating it to about 1/3 the size. Crunchy on the outside but chewy on the inside. Since I'm dehydrating it, next time I'm going to try making it without the gelatin mix.
Easy stuff to make btw (but time consuming) and he's still chowing down on it in its new form. Seems to require less now though. Expelling <5% I'd say.
Where in NoVA are you?