Data Set Stream Fish Densities: Atlantic salmon & other species
PEARL ID ASC02
PEARL Category Fauna
Data Provider Maine Atlantic Salmon Commission
Provider Contact Name Joan Trial
  Affiliation ASC
  E-mail joan.trial@maine.gov
  Web-site http://www.maine.gov/asc/
Data Status (Ongoing / Complete) Ongoing
First Upload to PEARL November 1, 2004
Latest Upload to PEARL May 16, 2006
Metadata Revised May 16, 2006
First Year in Data Set 1956
Most Recent Year in Data Set 2003
Number of Years with Data 40
Waterbody Type(s) Streams
Number of Sites Sampled 188 sites, 20 streams/tributaries
Abstract The Maine Atlantic Salmon Commission currently uses electrofishing as the primary tool for capturing juvenile Atlantic salmon.  Equipment consists mainly of battery powered backpack electrofishing units with some crews using an electrofishing boat for deeper, large river sampling.  Population estimates for two life stages (young-of-the-year and parr) are made using multiple run removal techniques.  Sites are enclosed with well-anchored seines.  Crews electrofish the site from the downstream boundary, working upstream in methodical, back and forth patterns, capturing and holding all juveniles encountered.  This “pass” is continued until the top of the site is reached and the catch is tabulated.  The numbers of passes required for a statistically usable estimate are determined by the catch per run.  Typically, estimates are possible using two or three runs.
Key References  
Map Click HERE to view map of sites sampled for this data set.
Data Fields:  Field Name Unit Description
Water Code Stream segment code from the USGS National Hydrographic Database.
Waterbody Name Stream name from NHD database.
County Name County in which stream segment is located.
Town Name Town in which stream segment is located.  Where a stream segment crosses town line(s), the given town is the one with the greatest segment representation.
HUC 12 12-digit USGS hydrologic unit code (watershed).
Drainage Drainage in which site is located.
Site Name Name of site at which samples were collected.
River Kilometer Location of sampling site, measured as number of kilometers from head of tide along stream centerline.
Date Date of sample collection
Species (Common Name) Common name of fish species.
Species (Scientific Name) Scientific name of fish species.
Life Stage Life stage of fish: yoy (=young-of-year); parr.
Area Sampled 100m2 habitat units Area of stream sampled by electrofishing (=section length x mean wetted width of site).
Density individuals per 100m2 Calculated density of species - growth stage.
95% CL (lower).  95% CL (upper) Lower 95% confidence interval of density estimate (or number of fish caught if total catch method used).

Upper 95% confidence interval of density estimate ( = -99 if estimate does not allow upper CL).

UTM (East).  UTM (North) Coordinates of sampling site.  UTM Zone 19, NAD 83.