I've tried and tried to cure them, but they always die anyway.

I just use about 1/4 pound of rock salt with a half a bag of ice in a small cooler. Keeps 'em froze solid. It's so cold that it hurts when you stick your hand in the water to get one out.

Just for fun, we caught a small greenling the other day. Thought we might use him for ling cod bait, so I stuck him in that brine and he froze solid in about 3 seconds.
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It's good to have friends
It's better to have friends with boats
***GutZ***