slowly end to end, bringing the line to the surface where the waterman catches the crab. Crabs on a trotline are not hooked, they are simply netted by the waterman at the surface, with the workboat moving slowly enough through the water that the crab does not discern movement as it eats the bait. The crab having been netted at the surface, the trotline moves back to or toward the bottom with the same bait intact to attract another crab. Depending on the length of the trotline (usually from at least 100 yards and up to a mile), a commercial waterman can catch anywhere from 4 bushels to 20 bushels of crabs daily. Construction Constructing a trotline is quite simple. Basic supplies needed are fishing hooks, clamps, swivels, fishing line, and a durable cord or lightweight rope used for the main line. Before constructing the trotline, it is a good idea to measure the span of the body of water being fished in order to give the main line an appropriate length. Once this is done, drop lines are set along the main line by threading clamps on the line with swivels between them. Fishing line is attached to the swivels and hooks are tied to the end of the fishing line. Typically, the drop lines are set so that the hook of one line can not touch the hook of another line, to prevent the fish from getting tangled up in multiple lines, or getting tangled in lines with other fish already on the line. This might mean using lines just over 1 foot long and having the lines spaced in 3 foot intervals. It is also typical to avoid setting lines directly over stumps, branches or other obstacles that might cause the fish to get tangled. This is done so that any released fish has a better chance of being in good health. Weighting the line is a matter of personal preference. In areas along rivers and channels with strong currents, large weights may be added to keep the line from being pulled close to the surface as the water passes over the line. Most weights used on trotlines are homemade as typical weights used by anglers do not weigh enough to keep the line in place. These may be made out of cement, cinder blocks, or even small boat anchors. Other common weights used include old fashioned