The 1994 fishwheel project on the Nass River, BC / prepared by M.R. Link and K.K. English. : Fs97-4/2421E-PDF

"Three fishwheels were operated on the lower Nass River from 7 June to 10 September 1994. The fishwheels operated for a total 5,835 hand captured 49,949 salmon. Catches included 26,472 sockeye, 12,436 pink, 7,670 coho, 2,913 chinook, 250 chum, and 208 steelhead. Of these, 10,916 sockeye, 4,811 coho, 1,917 chinook, and 60 steelhead were tagged. A total of 6,706 tagged fish were later recovered in fisheries and on tributaries of the Nass River. A total of 4,058 sockeye were selectively harvested from 2 of the fishwheels and from limited beach seining from 12 to 18 July. We used counts of marked and unmarked fish from the Meziadin fishway and inriver harvests to compute mark-recapture escapement estimate for sockeye salmon of 310,043. The fishwheels did not operate through the entire coho run and recovery efforts were confined to an early run stock (Meziadin River), thus, the escapement estimate of 161,237 coho upstream of the fish wheels represents a portion of the total coho escapement. The net chinook escapement (21,169) was estimated using carcass and tag recoveries from several sites in the watershed. The 3 fishwheels caught an estimated 7.6% of the sockeye run and 11.0% of the chinook run. The fish wheels caught an estimated 4.3% of the portion of the coho run that had similar run timing as the Meziadin River stock. We used daily tag release and recovery data to reconstruct the sockeye abundance in the lower river and assess the within-season variation in the portion of the run caught by the fishwheels. In contrast with previous years, the peaks in fishwheel efficiency on sockeye did not coincide with peak sockeye abundance or peaks in water levels"--Abstract, page x.

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