Trawling, though one of the most efficient methods of fish capture, is also found to be the most important human caused physical disturbance on the world's continental shelves and hence the physical destruction of
ecosystems (Jennings and Kaiser, 1998), Trawl fishery is generally a mixed fishery targeting a number of species and sizes simultaneously. Discarding is the practice of returning an unwanted section of the catch back to the sea during fishing operations (Alverson, 1994; Van Beek, 1998;
Hall,2000
