A typical 3 oz cooked serving of trout contains 22.6 grams of protein (26.6 g per 100 g), which makes it a very good source of protein. That covers roughly 45% of the 50 g reference Daily Value, so it can anchor a high-protein meal for the day.
About 56% of the calories in trout come from protein, which makes it very protein-dense - close to the practical ceiling for a whole food. Foods in this band are the ones that let you raise your protein intake without raising your calorie intake much at all.
Among the 121 seafood in the database, trout ranks 13th by protein per serving, and 83rd out of all 796 foods on the site. Set against king mackerel, another seafood entry in the database, a serving carries about 0.5 g more protein (king mackerel has 22.1 g per 3 oz cooked).
It is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own. The serving above is measured by weight at 85 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #172004 - "Fish, trout, mixed species, cooked, dry heat" (SR Legacy, published 4/1/2019). Values are the published reference figures for that record, not lab measurements for a specific brand or batch.
Quick answers
Trout protein FAQ
How much protein is in trout per 100 g?
Trout has 26.6 g of protein per 100 g. A typical 3 oz cooked serving (85 g) provides 22.6 g.
Is trout a complete protein?
Yes. Trout is a complete protein - it supplies all nine essential amino acids in adequate amounts, so it can carry a meal's protein on its own.
How much of the Daily Value does a serving of trout cover?
A 3 oz cooked serving of trout contains 22.6 g of protein, about 45% of the 50 g reference Daily Value.
Is trout a good source of protein?
Trout is a very good source of protein, and about 56% of its calories come from protein, which makes it very protein-dense. Set against king mackerel, another seafood entry in the database, a serving carries about 0.5 g more protein (king mackerel has 22.1 g per 3 oz cooked).