I have had sting ray in Korea, not sure how they prepared it, but to be honest I did not like it. The texture was stringy and it had a strong fishy taste. Granted, most of the fish over there had a strong fishy taste, so take that with a grain of salt. A better use for them is shark bait, now that's some fun fishing!
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"The sure way to get a bite while fishing is to talk about changing spots"