What Is the Difference Between Salmon and Trout?

Although salmon and trout belong to the same fish family (Salmonidae), they differ notably in their saltwater or freshwater habitats, flesh color, and fat content. Salmon are mostly farmed at sea, while trout are generally raised in freshwater ponds or rivers.

What causes the difference in color?
Salmon’s characteristic orange-pink color comes from carotenoid pigments in its diet, especially astaxanthin. In fish farms, this pigment is added to feed to achieve the desired flesh color. Depending on the species, trout flesh ranges from pale pink to whitish; rainbow trout generally has a lighter color.

How does fat content differ?
Salmon, especially Atlantic salmon, generally has a higher fat content than trout. This fat is rich in omega-3 fatty acids and helps keep the fish moist as it cooks. Trout has leaner flesh and can dry out easily if cooked quickly over high heat.

Which cooking methods suit each fish?
Salmon’s high fat content makes it well suited to high-heat grilling and roasting; its fat acts as a natural buffer that delays the flesh from drying out. Because trout fillets are thin, they are better suited to a short cooking time in a pan over low-to-medium heat. When baking whole trout, it is generally stuffed with lemon and herbs to reduce moisture loss. Salmon, especially wild-caught varieties, is more expensive than trout. Trout is easier and cheaper to farm in inland waters, so its retail price is generally more accessible. This price difference also affects how often the two fish are used in everyday cooking. Salmon has a more pronounced, rich, “fishy” flavor, while trout tastes milder and more neutral; people who do not like a fishy taste often find trout easier to eat. Both fish can be marinated or seasoned and used in many recipes regardless of their characteristic flavor. Size also affects how they are used in the kitchen: salmon is generally sold in large pieces or cut into fillets, while trout is smaller, so it is often sold and cooked whole. This size difference is also related to trout’s bones being easier to remove than salmon’s; trout has a fine, orderly bone structure that makes it suitable for filleting.

Labeling also differs for these two fish: “wild salmon” means the fish was caught in the open sea, while “farmed salmon” means it was raised in controlled ponds; fat content and price differ noticeably between these 2 options. Nearly all trout is farm-raised, so “wild trout” is much less common in stores. Wild river trout is generally limited by fishing bans and special permits, so nearly all trout found in stores is farm-raised, making it a more accessible option than salmon.