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.
The average 175 lb. moderately active man needs around 2,800 calories per day, and the average 125 lb. woman 2,000 calories. An 8 oz. serving of flounder makes up only 6.5 percent of an average man's daily calorie intake and 9 percent of a woman's. Aside from water, protein is the most abundant substance in flounder.