Wiktionary(0.00 / 0 votes)Rate this definition: upthrust(Noun) an upward thrust. upthrust(Noun) buoyancy. upthrust(Noun) an upward movement of part of the Earth's crust. upthrust(Verb) to thrust something upwards.
Predators, Food and Feeding: Natural predators of winter flounder include sharks, oyster toadfish, summer flounder, striped bass, monkfish and spiny dogfish. When feeding, a winter flounder will lie motionless, partly concealed on the bottom, with its head raised off the bottom, braced by the dorsal fin.
1 Season both sides of flounder fillets with salt. 2  Place into prepared baking dish. 3  Brush 1 tablespoon lemon juice over fillets. 4  Mix Parmesan cheese, melted butter, mayonnaise, green onions, and 2 tablespoons lemon juice in a bowl; spoon over the fillets. 5  Bake flounder in preheated oven for 10 minutes.