Vishnitzers don’t eat fish on Pesach because many many years ago, in order to keep the fish as fresh as possible, they would soak a piece of bread with some type of liquid when transporting it. I might not be correct on the exact details, but it’s something to that effect. To show you the importance of “minhagim”, the Viznitzer Rebbe that just was niftar once said that he would eat fish on Pesach, but that he wants to continue this minhag out of respect for his ancestors.
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