How Big is a 4oz Piece of Fish? A Visual Guide for Portion Control
                                
                                
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                                    4 min read                                
                            
                                According to the FDA, one standard serving of cooked seafood is 4oz, which is often visually equated to the size of a deck of playing cards. This simple trick can help you measure portions accurately without a scale, answering the common question: how big is a 4oz piece of fish?