Saw a device in an outdoor magazine on a trip to Asheville. A Sealline E-Case. A waterproof case with RF-welded seams and SealLock closure. Withstands submersion in one meter of water for up to 30 minutes. Seals like a puffy zip lock bag.

Both sides of the case are clear. Sharp pictures resulted with my trial. The phone buttons work fine. It retails or $29, but found one on Ebay for $12.34 shipped. Seller is xabstractx. Had 2 left when I bought mine last week.

Looks like an inexpensive solution for fish photos.