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Fish Nutrition Compared: The Complete Guide

By Alex Soto on 04/28/2026
Fish is widely regarded as one of the healthiest protein sources available. It is high in lean protein, rich in omega-3 fatty acids, and generally lower in saturated fat than red meat or poultry. But not all fish are nutritionally equal — the differences between species in terms of calories, protein, fat, and micronutrient content are significant enough to matter if you are making deliberate dietary choices.

This guide compares the most popular fish and seafood on the key nutritional metrics that matter most: calories, protein, fat, omega-3 content, and overall suitability for different dietary goals.

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