She has followed this practice since last fall, when frozen pollock fillets she purchased at another store seemed to weigh less than what the label indicated.

Even her husband noticed. "How come you cooked so little?'' she recalled him saying. Jih said she suspected she had been charged for the ice with her fish.

"How many people had the same thing happen as I did?"

Jih's experience apparently is widespread. Voluntary inspections of seafood distributors by an arm of the federal Commerce Department find nearly a third of seafood they check is mislabeled, usually because of ice being included in the weight of the fish, but more recently because of the added weight of frozen or watery marinade preservatives.