Application of the Genetic Mark–Recapture Technique for Run Size Estimation of Yukon River Chinook Salmon

2014 ◽  
Vol 34 (2) ◽  
pp. 276-286 ◽  
Author(s):  
Toshihide Hamazaki ◽  
Nick DeCovich
Keyword(s):  
Chinook Salmon ◽  
Size Estimation ◽  
Mark Recapture ◽  
Yukon River

scholarly journals Evaluation of Long-Term Mark-Recapture Data for Estimating Abundance of Juvenile Fall-Run Chinook Salmon on the Stanislaus River from 1996 to 2017

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Tyler Pilger ◽  
Matthew Peterson ◽  
Dana Lee ◽  
Andrea Fuller ◽  
Doug Demko
Keyword(s):  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Estimation Method ◽  
Central Valley ◽  
Mark Recapture ◽  
Important Species ◽  
Trap Efficiency ◽  
Monitoring Programs ◽  
Abundance Estimates

Conservation and management of culturally and economically important species rely on monitoring programs to provide accurate and robust estimates of population size. Rotary screw traps (RSTs) are often used to monitor populations of anadromous fish, including fall-run Chinook Salmon (Oncorhynchus tshawytscha) in California’s Central Valley. Abundance estimates from RST data depend on estimating a trap's efficiency via mark-recapture releases. Because efficiency estimates are highly variable and influenced by many factors, abundance estimates can be highly uncertain. An additional complication is the multiple accepted methods for how to apply a limited number of trap efficiency estimates, each from discrete time-periods, to a population’s downstream migration, which can span months. Yet, few studies have evaluated these different methods, particularly with long-term monitoring programs. We used 21 years of mark-recapture data and RST catch of juvenile fall-run Chinook Salmon on the Stanislaus River, California, to investigate factors associated with trap efficiency variability across years and mark-recapture releases. We compared annual abundance estimates across five methods that differed in treatment of trap efficiency (stratified versus modeled) and statistical approach (frequentist versus Bayesian) to assess the variability of estimates across methods, and to evaluate whether method affected trends in estimated abundance. Consistent with short-term studies, we observed negative associations between estimated trap efficiency and river discharge as well as fish size. Abundance estimates were robust across all methods, frequently having overlapping confidence intervals. Abundance trends, for the number of increases and decreases from year to year, did not differ across methods. Estimated juvenile abundances were significantly related to adult escapement counts, and the relationship did not depend on estimation method. Understanding the sources of uncertainty related to abundance estimates is necessary to ensure that high-quality estimates are used in life cycle and stock-recruitment modeling.

Effect of Ichthyophonus on blood plasma chemistry of spawning Chinook salmon and their resulting offspring in a Yukon River tributary

2017 ◽  
Vol 122 (3) ◽  
pp. 223-236 ◽  
Author(s):  
TP Floyd-Rump ◽  
LA Horstmann-Dehn ◽  
S Atkinson ◽  
C Skaugstad
Keyword(s):  
Blood Plasma ◽  
Chinook Salmon ◽  
Plasma Chemistry ◽  
Yukon River

Using thalweg profiling to assess and monitor juvenile salmon (Oncorhynchus spp.) habitat in small streams

2006 ◽  
Vol 63 (7) ◽  
pp. 1515-1525 ◽  
Author(s):  
Brent Mossop ◽  
Michael J Bradford
Keyword(s):  
Chinook Salmon ◽  
Stream Flow ◽  
Gold Mining ◽  
Oncorhynchus Tshawytscha ◽  
Fish Habitat ◽  
Juvenile Chinook Salmon ◽  
Yukon River ◽  
Small Streams ◽  
Longitudinal Profiles ◽  
Small Tributary

Thalweg profiles are longitudinal profiles of the streambed elevation measured along the deepest portion of the stream. This technique has recently been advocated as a tool to assess and monitor fish habitat in streams because metrics calculated from thalweg profiles can provide useful information on habitat quality, and measurements are both repeatable and independent of stream flow. Relations between thalweg metrics and land use have also been documented. However, a relation between fish abundance and thalweg metrics has not been established. To develop this relation, we surveyed thalweg profiles and sampled juvenile Chinook salmon (Oncorhynchus tshawytscha) density in 14 reaches of small tributary streams of the upper Yukon River. Chinook salmon density was correlated with three thalweg metrics. Two of these metrics — length in residual pool and mean maximum residual pool depth — provided useful measures of pool extent and quality and useful information on Chinook salmon habitat. Thalweg metrics differed between these undisturbed streams and reaches in streams affected by placer gold mining. These results suggest that thalweg profiling provides a useful tool to assess and monitor fish habitat in small streams.

Population size estimation of an Asian elephant population in eastern Cambodia through non-invasive mark-recapture sampling

2014 ◽  
Vol 15 (4) ◽  
pp. 803-810 ◽  
Author(s):  
Thomas N. E. Gray ◽  
T. N. C. Vidya ◽  
Sheetal Potdar ◽  
D. K. Bharti ◽  
Prum Sovanna
Keyword(s):  
Population Size ◽  
Population Size Estimation ◽  
Asian Elephant ◽  
Size Estimation ◽  
Mark Recapture ◽  
Non Invasive ◽  
Elephant Population

Advances in Fish Tagging and Marking Technology

2012 ◽  
Keyword(s):  
Data Quality ◽  
Feasibility Study ◽  
Chinook Salmon ◽  
Sockeye Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Similar Data ◽  
Pit Tag ◽  
Mark Recapture ◽  
New Type ◽  
Fish Tagging

<i>Abstract</i>.—A feasibility study was begun in 2005 to obtain annual escapement information for sockeye salmon <i>Oncorhynchus nerka </i>over a minimum 3 years, using fish wheels and mark–recapture techniques already employed for Chinook salmon <i>Oncorhynchus tshawytscha </i>since 2001. Failed trials using both traditional spaghetti tags and injected PIT tags led to development of a new type of dorsal tag which which encapsulates a 134.2 KHz PIT tag in the marker of a 70 mm dual-anchor T-Bar tag. This tag was first employed in 2007 to estimate the inriver abundance of Chinook and sockeye salmon returning to the Copper river. For the first sample event, up to three live-capture fish wheels were operated at Baird Canyon for a total of 4,495 h from 18 May to 6 August. During this period, 4,456 adult Chinook salmon and 11,027 adult sockeye salmon were marked. For the second sample event, up to two fish wheels were operated at Canyon Creek near the lower end of Wood Canyon for 3,717 h from 28 May to 19 August. A total of 4,192 Chinook salmon and 56,5511 sockeye salmon were examined for marks. Of these, 459 Chinook salmon and 521 sockeye salmon were recaptures. Using a temporally stratified Darroch estimator, abundance of Chinok salmon measuring 500 mm FL or greater than migrated upstream of Baird Canyon from 18 May to 6 August was 46,349 (SE = 3,283). Using a similar estimator, estimated abundance of sockeye salmon that migrated upstream of Baird Canyon from 18 May to 6 August was 1,290,591 (SE = 92,590). This was the first ever defensible escapement estimate derived for sockeye salmon on the Copper River, and the fifth straight year for Chinook salmon with similar data quality to previous years using traditional spaghetti tags.

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