4 ounces of cod fillet is a standard serving size for this type of fish. It is about the size of a tennis ball.

In kitchen measures
7.67 tablespoons
23 tsp · 7.67 tbsp · 0.479 cups
about the size of a tennis ball
Density estimated by AI from typical values. Cod fillet typically ranges 0.9–1.1 g/mL depending on how it's packed. A firmly packed scoop weighs more.