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During 1994, a large scale stock-assessment program was implemented to determine the status of steelhead and coho populations in the Skeena River. Catches in commercial fisheries were to be monitored by means of a fishery observer program. Escapements were to be estimated primarily by fence counts combined with radio-tagging
and tracking operations. This report describes (i) the rationale for the approach selected, (iiI the procedures used to determine the distribution of observer, tagging, and survey effort
levels required, and (iii) the features of the model used to estimate escapements to each major tributary. Planning studies suggested that 20-30 observers-days per week would be
required to provide estimates of steelhead catches that are within ? 32% of the actual value. Approx. 250 steelhead and 350 coho should be radio-tagged to estimate escapements. This objective could be met by having two seiners operate in the mouth of the river for 4 d'wk- 1 each, from the second week of July to the last week in September. Fifteen radio-tracking devices installed upstream of the fishery, and at the confluence of
each major tributary should be operated until the following spring to monitor movement patterns, tag loss and tag escapements. Escapement enumerations and stream surveys
should be conducted at index sites throughout the system to determine tagged proportions and estimate escapements to non-index sites. Bio-samples collected in each tributary and
during the tagging-tracking operations will be analyzed to identify genetic markers and estimate genetic variation. The plan recommends that the monitoring program be continued for two or more years to assess the level of annual variations. After this period,
the information obtained should allow scientists to design a more cost-effective and logistically simpler method to provide catch and escapement estimates on an annual basis.
Labelle, Marc, Susan Pollard, Russ Frith, Karl English. 1995. Skeena River Steelhead Stock-Assessment Program: 1994 Catch and Escapement Monitoring Plan. Ministry of Environment, Lands and Parks. Fisheries Progress Report. 44
English Name: Chinook Salmon, Pink Salmon, Rainbow Trout, Sockeye Salmon
Other Identifier: FPR44 FPR 44
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