Factors Affecting Stream Location, and Timing and Intensity of Entry by Spawning Kokanee (Oncorhynchus nerka) into an Inlet of Nicola Lake, British Columbia

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Abstract
Diel fluctuations in onshore–offshore movement of mature kokanee occurring at the northeast end of Nicola Lake adjacent to a spawning stream were related to differences in wind action, which thereby affected daily numbers of kokanee entering this stream. Nasal occlusion experiments indicated that olfaction was used in location of the stream by kokanee. Entry into the stream occurred largely from dusk to midnight and appeared to be related to changes in light intensity rather than temperature. Average length of spawning kokanee (sexes combined) ranged between 225.9 and 289.9 mm from 1958 to 1963 with marked annual differences. Most kokanee spawned in their third year (2 +) although some were in their second and fourth years (1 + and 3 +). About equal numbers of both sexes occurred in the spawning population; males were more abundant at the onset of the migration while females were predominant towards the end.

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