Adult Anadromous Fish Radiotelemetry Project (1996-2004)

 NOAA College of Natural Resources, University of Idaho US Army Corps of Engineers
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Data Queries
Event Summaries
Detection Details
Release Details
One Tag Details
Diel Activity
Travel Time Estimates
Reach Travel Time All Years
 

Travel Time Estimates

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The Travel Time Estimates are based on the release date for each radio-tagged fish and the first approach (A1**) and last record at top-of-the-ladder (LT) times at each upstream detection site. Travel Time estimates for release to upstream site are calculated using the release time and the time of the first approach (A1**) record at the upstream site. Reach travel time is based on the last record at the top-of-ladder site (LT) at the first project and the first approach record (A1**) at the second project.

Arithmetic Mean Travel Time
( reach travel time ) / number of unique fish detected at the detection sites

Harmonic Mean Travel Time
number of unique fish detected at the detection sites / ( (1/reach travel time) )

When dealing with travel times, we are primarily interested in the speed with which fish travel from point A to point B. A good statistic for describing a particular group's speed is the harmonic mean. A harmonic mean is used when working with rates of speed, usually the number of days to travel a set distance. A benefit to using the harmonic mean is that it is more robust in the presence of outliers (i.e., a very fast or slow fish).

AAFRP Project Description Data Description Glossary Maps & Publications Contact