Proceedings - Teaching and Learning Centre - Simon Fraser ...

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Fraser River Action Plan 3rd Research Workshop of adults were detected in the lower Nechako and Willow rivers in mid-October. Many of these fish were close to spawning. Five such fish were radio-tagged in the lower Nechako and eight fish near spawning (males running milt) were radio-tagged in the mainstem Fraser. These radio-tagged fish were followed until freeze-up (late November). Two of the Nechako fish made micro-movements (a few 100 m) but stayed in the aggregation area. Three Nechako fish moved downstream in the Fraser where they stayed for several days and then moved downstream in fits and starts (e.g., they would hold position for a few days and then suddenly move 15 km, stop and hold position again, and then suddenly make another spurt of movement). The maximum tracked downstream movement of these Nechako fish was 50 km. The radio-tagged Fraser fish showed a similar pattern of movement: hold for a few days, then move 10 - 20 km downstream and hold again. All of the radio-tagged fish that moved, moved downstream. It is not clear if this was a spawning migration or if the tags were too large and the fish were slowly losing ground. For adults, it was not clear how much mixing there was between the major tributaries and the main river. There was a scale signature (a false annulus) that was only found in mainstem fish. However, not all fish sampled in the mainstem showed this scale mark. So far, the data suggest some fish move from the tributaries into the main river and some stay in the tributaries. We took tissue samples (adipose fin clips) from all adult fish and are using single locus probes to ascertain if there are genetically different stocks in this area. Another problem with adults that is being examined is the presence of two “forms” of mountain whitefish in the area: a long-nosed “pinocchio” form and a normal form. The pattern of head growth in the two forms starts to diverge at about 80 mm and becomes more exaggerated with size. It looks like a foraging polymorphism and we collected paired samples (collected at the same site and same time) of both types. These are being examined for both trophic and genetic differences. Other Species During the course of collecting whitefish data, information was also collected on the movements of redside shiners, squawfish, peamouth chub and suckers. The general pattern of movement that appeared in these animals was a spawning movement into tributaries in the spring, use of the lower reaches of tributaries by yo-y, movement into the main river in September, and then movement to a winter refuge (deeper water?) in October. Page 214
Fraser River Action Plan 3rd Research Workshop Fraser Fish Database Goal Assemble information on distribution (past and present), macro-habitat use, and lifehistories of Fraser River fish. Information Sources • UBC collection, Ministry of Environment, Lands and Parks fish database Operating Modes 1. Access - for quick queries • Access mode - typical Access queries (e.g., species by tributary, species by macro-habitat, and co-occurences) • Advantages: will plot large-scale distribution maps fast 2. Arcview - for more detail • Arcview mode - slow, but can zoom down to 100 m reaches (if the data exists) Beta Version On-line in about three months Whitefish Life-Histories Habitat Use Y-O-Y Juveniles and Adults Food Y-O-Y Juveniles and Adults Growth Y-O-Y Juveniles and Adults Movements Y-O-Y Juveniles and Adults Stock Structure Genetics Morphology Other Species Page 215
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PROCEEDINGS 3rd RESEARCH WORKSHOP F
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TABLE OF CONTENTS Participants ....
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Development of a Citizen’s Monito
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Fraser River Action Plan 3rd Resear
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SESSION 1 PULP MILL EFFLUENT ISSUES
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Fraser River Action Plan The Use of
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Fraser River Action Plan Concluding
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