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Fish Distribution and Relative Abundance of Streams within the Lapwai Creek and Big Canyon Creek Watersheds
Mean lengths and weights by age class
Population age structure
|Dates of Data
||2003 TO 2007
|Data Set Status
|Data Set Update Schedule
|Date Data Set Published on StreamNet Data Store
|Project Name & Number
||BPA project numbers 1999-016-00 and 1999-017-00
|Purpose of Data Set
||Purpose provided in Abstract
|Summary / Abstract
||Data was collected through fish distribution and relative abundance surveys of the Lapwai Creek and Big Canyon Creek watersheds within the Lower Clearwater Subbasin. Surveys were conducted on all perennial flows accessible to anadromous salmonids.
Each study stream was divided into one kilometer segments, one 50 meter reach being located within every segment through systematic site selection utilizing a random number generator. Data was collected through electrofishing sampling utilizing Smith-Root LR-24 24 volt backpack electrofishers fitted with 11 inch ring anodes and rat-tail cathodes. The LR-24's were programmed to output pulsed DC current with frequency, duty cycle, and voltage settings adjusted relative to site conductivity and temperature. Unblocked single-pass sampling was employed with shocked fish netted and retained in electrically aerated 19 liter polyethylene buckets. Electrofishing crews consisted of one operator and two netters. Water temperature was recorded prior to each pass. In accordance with ESA Section 10 Scientific Research permits, electrofishing activities were aborted when stream temperatures reached 19 C to minimize potential stress to salmonids. Channel morphology data collected at all sites is available within the corresponding report.
Densities, biomass, and average size of all fish species were estimated through use of MicroFish 3.0 DOS software (VanDeventer and Platts, 1985). Prior to data entry into the MicroFish program, O. mykiss were divided into subyearling, 1, 2, and 2+ year age classes. Subyearling and yearling age-to-length ratios were established through visual analysis of length-frequency histograms developed from O. mykiss data generated through both this project and concurrent fish distribution surveys located within the study area. Scale sample analysis was utilized to establish minimum length-age classifications for two year and 2+ O. mykiss as efficacy of length-frequency histograms were compromised by the relatively small data sets available for these larger fish.
|Broad Biological Groups
||Oncorhynchus mykiss (steelhead/rainbow trout): Snake River DPS, summer rearing stage.
Oncorhynchus tshawytscha (Chinook salmon): Snake River fall ESU, summer rearing stage.
Cottus beldingi (Paiute sculpin)
Rhinichthys osculus (speckled dace)
Catostomus columbianus (bridgelip sucker)
Catostomus macrocheilus (largescale sucker)
Richardsonius balteatus (redside shiner)
Ptychocheilus oregonensis (Northern pikeminnow)
Acrocheilus alutaceus (chiselmouth)
Micropterus dolomieu (smallmouth bass)
Lepomis gibbosus (pumpkinseed)
||Lapwai Creek and Big Canyon Creek Watersheds
Nez Perce, Lewis and Clearwater Counties
Lower Clearwater River Subbasin
|NPCC Subbasins (2001 Subbasins)
||Mountain Snake: Clearwater
||Oncorhynchus mykiss, steelhead, rainbow trout, fish density, Lower Clearwater, Nez Perce Tribe
|Lead Person and Organization That Created the Data Set
|Other Participating Organizations
||Nez Perce Tribe
|Contact Person for Questions About the Data
||Name: Clint Chandler
Position: Fisheries Biologist
Organization: Nez Perce Tribe
Address: PO Box 365
email: Send a note to nezperce.org addressed for clintc
|Broad Category of Methods
|Data Collection Methods
'Condition factor' column in the spreadsheets refer to Fulton's condition factor (CF = W / TL3 X 105), where:
CF= condition factor
W= body weight in grams
TL= Total length in mm.
Average condition factor was calculated for each of the listed age classes within MicroFish.
||Microsoft Excel (.xls)
|Data structure description
||See data set files
|URL where updated data may be available
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