Graduate Thesis Or Dissertation

 

Aspects of life history characteristics and physiological processes in smolting Pacific Lamprey, Lampetra tridentata, in a central Oregon coast stream Public Deposited

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  • Rotary screw traps were used to estimate Pacific lamprey smolt yield, outmigration timing, age structure and sex ratio for Tenmile Creek basin, Lane County, Oregon. Traps were fished March to June and August to December 1994 and March to June and October to December 1995. Lamprey smolts caught in the traps were marked and released upstream. Recaptured fish were used to calculate trap efficiencies and daily and weekly estimates of outmigrating smolts. Little movement of smolts occurred before November. Outmigration peaked in late November and was complete both years by 2 December. Ages of smolts were determined using length-frequency analysis and by reading statoliths. Tenmile Creek Pacific lamprey smolts have an extended freshwater residency. Male to female ratios were approximately 1:1 both years. Larval, metamorphosing and smolting Pacific lamprey were examined for changes in skin guanine concentrations, gill (Na+K)-ATPase activities and plasma thyroid hormone levels during a 14 mo period. Seasonal peaks were observed in gill (Na+K)-ATPase activities and plasma thyroid hormone levels in larvae. Metamorphosing and smolting lamprey showed increases in skin guanine concentrations and gill (Na+K)-ATPase activities along with decreases in plasma thyroid hormone levels. Smolting lamprey challenged with artificial seawater showed no significant changes in the parameters observed.
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