Weakfish, a.k.a. squeteague or sea trout, has begun its annual migration in large schools up the Atlantic coast. . . . The name, weakfish, is no slur on its character; it refers to the delicate mouth of this fish, which is easily torn by a hook. Otherwise the weak has a lean and flaky white flesh that is delicious when very freshly caught. It tends to become soft and flabby if not cooked right away and its blandness needs some exciting flavor accents to be interesting.