Put your herring in a bucket of sea water and rock salt. I usually cut plug them all before hand. I also add ice occasionally on the hot days of summer. This will keep your herring fresh and firm for more than a day.
The one draw back....if you have any cuts on your hands, and I always do salmon fishing, you will definitely know it when you reach in that buacket! HOO BOY!
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"You learn more from losing than you do from winning." Lou Pinella