Table of contents
Northern Pike Minnow Predation and Movement
Removal of stomach for analysis
Removal and storage of stomach contents.
Analysis of contents via stained hard structures
Identification to species
2004 Stomach Contents
2005 Juvenile Passage Data
Catch Per Unit Effort: Developing an Index of Relative Abundance
Why use an index?
What factors can effect CPUE?
Environmental and Biological Factors include:
River Flow Above Parker dam (Sunnyside dam), taken near Umtanum
River Flow below Parker dam
Comparison of current water year with previous and average water years at Parker.
CPUE Total for March 25th - May 24th 2004
Catch per Unit Effort for March – June 1, 2005
High water Period Below Dam 2004
Low Water Period Below Dam due to water withdrawal 2004
Tag methodology: External attachment of tag on left side of dorsal fin
Tag is anchored on right side of fish with a plastic saddle
The end result- tag lies on the side of the dorsal resulting in minimal damage to the fish
Tracking of radio tags
Locations of tags 79-89
Locations of tagged fish
Movement: more questions created than answered….