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.
Protein in Flounder. The amount of protein present in flounder depends on the portion size. One fillet of flounder is typically about 3 to 4 oz., slightly larger than the size of a deck of cards. According to the U.S. Department of Agriculture Nutrient Data Laboratory, one 4-oz. fillet of flounder, or about 127 g of flounder, contains about 19 g of protein, and one 3-oz.