You should be able to find Panko at just about any Stop and Shop, at least the ones over here have them. They are with the breadcrumbs.
Panko flakes have a very clean flavor and more surface area, so they create a delicate crunchy crust, rather than a hard breadcrumb crust. You can substitute Panko just about anywhere breadcrumbs are called for. They are almost always unseasoned, so make sure you season them with salt/pepper etc...
You can make fishcakes with just about any whitefish. Striper has a pretty moderate flavor, so if you used something stronger I might cut back on the capers. I personally don't ever freeze fish, but it would work, just not be as good.
-spence
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