Results of rotary auger trap sampling in the Nanaimo River, 1996 / by D.A. Nagtegaal and E.W. Carter.: Fs97-4/2391E-PDF

"In 1996, the Dept. of Fisheries and Oceans, Pacific Biological Station, initiated a study of juvenile chinook salmon (Oncorhynchus tshawytscha) productivity in the Nanaimo River. This study was implemented in conjunction with the Nanaimo First Nations and the key components of this ongoing project include: i) enumeration of juvenile outmigrants, ii) monitoring growth of hatchery and naturally-reared fry, iii) monitoring hatchery releases and interaction between hatchery and naturally-reared fry in the river. A rotary screw trap was used to estimate naturally-reared fry production. Bismarck Brown dyed hatchery and naturally-reared chinook juveniles were released above the trap and mark-recapture results were used to expand trap catches to estimate total production. The minimum estimate of the production of naturally-reared juvenile chinook for 1996 brood year was 366,725 (range: 348,352 - 385,006). Hatchery releases of chinook fry and smolts (based on hatchery records) were 601,298, of which approximately 188,648 were estimated to have left the river by May 30. The interaction between the early release hatchery group and naturally-reared juveniles was believed to be minimal since most of the hatchery fish moved out of the river in just a few days after release"--Abstract, page v.

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