The 2001 fishwheel project on the Nass River, BC / prepared by Richard F. Alexander and Robert C. Bocking. : Fs97-4/2659E-PDF

"Up to six fishwheels were operated on the lower Nass River from 7 June to 14 September 2001. The fishwheels operated for a total of 10,783 h and captured 124,961 salmon. Catches of adult salmon included 32,821 sockeye, 42,508 pink, 22,705 coho, 12,106 chinook, 1,435 steelhead, and 162 chum. Of these, 6,841 sockeye, 3,317 coho, 3,600 chinook salmon, and 1,346 steelhead were tagged. Totals of 586 chinook, 1,501 sockeye and 753 coho salmon from the catch were successfully aged using scales. A total of 9,192 tagged fish were later recovered (or observed) at the Meziadin fishway, in in-river fisheries and on tributaries of the Nass River. From 27 June to 23 August, a total of 1,901 chinook, 12,267 sockeye and 5,745 coho were selectively harvested from the fishwheels as part of the entitlement and harvest agreements of the Nisga'a Treaty (NFA 2000). Counts of marked and unmarked fish from the Meziadin fishway and in-river harvests were used to compute net escapement estimates for sockeye (167,250) and coho salmon (79,787). The coho estimate represented only a portion of the total coho escapement because the fishwheels did not operate through the entire coho run and recovery efforts were confined to an early run stock (Meziadin River). The net chinook escapement (28,329) was derived by a mark-recapture estimate (spawning ground surveys) minus estimated in-river harvests above Grease Harbour tagging sites. The six fishwheels combined caught an estimated 33.6% of the chinook run, 16.0% of the sockeye run, and 25.4% of the coho run. Including subsequent in-river harvests, an estimated 41,059 chinook and 233,046 sockeye salmon entered the Nass River in 2001. Daily tag release (at the fishwheels) and recovery data (at the Meziadin fishway) were used to reconstruct the sockeye abundance in the lower river and assess the within-season variation in the portion of the sockeye run caught by the fishwheels"--Abstract, page ix.

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