DDMMON#1 Lower Duncan River ramping rate monitoring: Phase V investigations
Author: Poisson Consulting Ltd., Golder Associates Ltd
This report summarizes the results of five years of flow reduction (ramping rate) experiments (four study years pre-date DDMMON-1). Mark-recapture methods and net pens were used to further assess the relationship between the probability of fish stranding and time of day of flow reductions (day vs. night), and to continue to assess the effect of ramping rate on the probability of fish stranding. Various models were used to assess the variables most relevant to stranding rates in the Duncan River.
The results of the analysis showed a trend for more fish to strand at night than during the day thus partially addressing management question 1b. This trend was interesting, but the result was not statistically significant and the response variable showed high variability both during daytime and at night (Figure 5). Although ramping rate is not included in any of the top ranked statistical models and has never emerged as statistically significant, the trend has consistently been that more fish tend to strand with higher ramping rates. Rainbow trout and longnose dace were the main species encountered during the ramping experiments conducted from 2004 to 2007 and they remained the dominant species observed in 2009.
The results of the analysis showed a trend for more fish to strand at night than during the day thus partially addressing management question 1b. This trend was interesting, but the result was not statistically significant and the response variable showed high variability both during daytime and at night (Figure 5). Although ramping rate is not included in any of the top ranked statistical models and has never emerged as statistically significant, the trend has consistently been that more fish tend to strand with higher ramping rates. Rainbow trout and longnose dace were the main species encountered during the ramping experiments conducted from 2004 to 2007 and they remained the dominant species observed in 2009.
Resources Data:
Name: DDMMON-1_YR1_APR_2010
Format: PDF
URL: https://www.bchydro.com/content/dam/hydro/medialib/internet/documents/planning_regulatory/wup/southern_interior/2010q2/ddmmon-1_yr1_apr_2010.pdf
Additional Info
Study Years: 2010, 2009, 2008
Published: 2010
DDMMON#1 Lower Duncan River ramping rate monitoring: Phase V investigations
Author: Poisson Consulting Ltd., Golder Associates Ltd
Tags: Adaptive Stranding Protocol Development ASPD, DDMMON1, DDMMON16, Fish Stranding, Flow, Flow Reduction, Longnose Dace, Lower Duncan River, Markrecapture, Oncorhynchus Mykiss, Operational Recommendations, Rainbow Trout, Ramping Rate, Rhinichthys Cataractae, WLR
This report summarizes the results of five years of flow reduction (ramping rate) experiments (four study years pre-date DDMMON-1). Mark-recapture methods and net pens were used to further assess the relationship between the probability of fish stranding and time of day of flow reductions (day vs. night), and to continue to assess the effect of ramping rate on the probability of fish stranding. Various models were used to assess the variables most relevant to stranding rates in the Duncan River.
Summary
The results of the analysis showed a trend for more fish to strand at night than during the day thus partially addressing management question 1b. This trend was interesting, but the result was not statistically significant and the response variable showed high variability both during daytime and at night (Figure 5). Although ramping rate is not included in any of the top ranked statistical models and has never emerged as statistically significant, the trend has consistently been that more fish tend to strand with higher ramping rates. Rainbow trout and longnose dace were the main species encountered during the ramping experiments conducted from 2004 to 2007 and they remained the dominant species observed in 2009.