Cynoscion regalis is a marine fish species in the family Sciaenidae, commonly known as the weakfish or gray seatrout, native to the western Atlantic Ocean along the eastern coast of North America from Nova Scotia to Florida. The genus name Cynoscion derives from Greek kyon (“dog”) and skiaena (a type of fish), referring to the prominent canine-like teeth characteristic of many members of this group, while the species epithet regalis is Latin for “royal,” likely reflecting its historical value as a prized food fish. It inhabits estuaries, bays, and nearshore coastal waters, often moving seasonally between deeper offshore areas and shallow inshore environments.

This species has an elongated, silvery body with subtle spotting and a soft, delicate mouth structure, which contributes to its common name “weakfish”. It is a predatory fish feeding on smaller fish, shrimp, and other crustaceans, playing an important ecological role in estuarine food webs. Cynoscion regalis has historically supported both commercial and recreational fisheries along the U.S. East Coast, though populations have fluctuated due to fishing pressure and environmental factors.

Cynoscion regalis is valued for its tender, flaky white flesh with a mild, slightly sweet flavor. It is commonly prepared by pan-frying, baking, broiling, or grilling, though its delicate texture requires careful handling to prevent the flesh from breaking apart. Compared to firmer fish species, weakfish is less suited to rough processing or long storage but is highly regarded when fresh. Nutritionally, it provides high-quality protein, essential amino acids, and moderate amounts of omega-3 fatty acids, along with vitamins such as B12 and minerals including selenium and phosphorus.

Bioactive compounds present in Cynoscion regalis include omega-3 fatty acids such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are associated with cardiovascular and neurological health, as well as small peptides that may exhibit antioxidant or antihypertensive properties upon digestion. Major ingredients derived from this food source consist primarily of fresh or filleted fish used directly in culinary preparations rather than extensively processed products. Cynoscion regalis remains an important regional seafood species, appreciated for its flavor and role in coastal food traditions.