, avoiding the problem of changes in the number of hooks per line. However, this quantification does not reflect increases in efficiency through reduced visibility of the fishing lines or use of swivels, nor the effect of better fish-finding technology and knowledge of fish behavior on catch rates. Trawl effort is measured as number of hours trawled, standardized according to vessel size, and does not take into account net size and engine power. In addition, improved fish-finding equipment,