Estuarine Net Counting Fence for Trapping Atlantic Salmon

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Abstract
A counting fence of tarred cotton netting suspended from wire ropes was stretched across the estuary of the Little Codroy River, Newfoundland, at right angles to the current to study migrating Atlantic salmon during the open water seasons from 1954 to 1963. The river was 921 ft wide at the site; the average depth in the center was 7.8 ft, and the average surface velocity outward was 0.8 ft/sec. The fence was stable for most conditions encountered. Two types of traps were used to catch the seaward migrating smolts; both types were constructed of wood and wire mesh. Smolts were taken out of one of them to be counted and marked, but they were counted in the 2nd without being taken from the water. Two types of traps were also used to catch upstream migrating adult salmon; one was constructed of wood and wire mesh and the 2 was made of netting. The total cost of the fence was about $20,000, about half of which was required to set it up.

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