Final Report
Author: P.N. Johnson, S. LeBourdais, M. Tiley
The primary objective of CLBMON-23B was to assess the efficacy of duel-frequency identification sonar (DIDSON) for monitoring the presence and behavior of white sturgeon spawners.
A total of 267 observations of sturgeon were documented based on fixed-station DIDSON sampling in 2007. Sturgeon were first observed on 1 August and last detected on 30 August. We also observed a total of six images of two individual sturgeon collected simultaneously within the DIDSON field-of-view. In 2007, the majority of sturgeon movements occurred between 8 and 14 August. A total of 64 observations of sturgeon were noted from the fixed DIDSON station in 2008, the first observation occurred on 13 July and the last on 23 August. There was one instance of two sturgeon observed simultaneously near one another in 2008. The majority of sturgeon movements in 2008 occurred from 1 to 3 August, immediately following a sturgeon spawning event estimated to have occurred on 31 July. In 2009, 210 sturgeon observations were observed with peak activity occurring 28 through 31 July. Eleven instances occurred when more than one sturgeon was sampled at the same time in 2009. Also in that year data were collected that appears to show a sturgeon releasing gametes. Sturgeon activity within the sample area generally increased during nighttime hours relative to daytime hours in all years. Hourly peaks in sturgeon observations occurred during the late evening in 2007, the early morning in 2008, and early evening in 2009. Mobile sampling detected a single sturgeon in 2007 and no sturgeon in 2008 (mobile sampling was not conducted in 2009.
A total of 267 observations of sturgeon were documented based on fixed-station DIDSON sampling in 2007. Sturgeon were first observed on 1 August and last detected on 30 August. We also observed a total of six images of two individual sturgeon collected simultaneously within the DIDSON field-of-view. In 2007, the majority of sturgeon movements occurred between 8 and 14 August. A total of 64 observations of sturgeon were noted from the fixed DIDSON station in 2008, the first observation occurred on 13 July and the last on 23 August. There was one instance of two sturgeon observed simultaneously near one another in 2008. The majority of sturgeon movements in 2008 occurred from 1 to 3 August, immediately following a sturgeon spawning event estimated to have occurred on 31 July. In 2009, 210 sturgeon observations were observed with peak activity occurring 28 through 31 July. Eleven instances occurred when more than one sturgeon was sampled at the same time in 2009. Also in that year data were collected that appears to show a sturgeon releasing gametes. Sturgeon activity within the sample area generally increased during nighttime hours relative to daytime hours in all years. Hourly peaks in sturgeon observations occurred during the late evening in 2007, the early morning in 2008, and early evening in 2009. Mobile sampling detected a single sturgeon in 2007 and no sturgeon in 2008 (mobile sampling was not conducted in 2009.
Resources Data:
Name: CLBMON-23B_FEASIBILITY
Format: PDF
URL: https://www.bchydro.com/content/dam/hydro/medialib/internet/documents/planning_regulatory/wup/southern_interior/2010q2/clbmon-23b_feasibility.pdf
Additional Info
Study Years: 2009
Published: 2010
Final Report
Author: P.N. Johnson, S. LeBourdais, M. Tiley
Tags: Acipenser Transmontanus, Arrow Lakes Reservoir, CLBMON23B, DIDSON, Habitat Use, Monitoring Recommendations, Underwater Videography, White Sturgeon
The primary objective of CLBMON-23B was to assess the efficacy of duel-frequency identification sonar (DIDSON) for monitoring the presence and behavior of white sturgeon spawners.
Summary
A total of 267 observations of sturgeon were documented based on fixed-station DIDSON sampling in 2007. Sturgeon were first observed on 1 August and last detected on 30 August. We also observed a total of six images of two individual sturgeon collected simultaneously within the DIDSON field-of-view. In 2007, the majority of sturgeon movements occurred between 8 and 14 August. A total of 64 observations of sturgeon were noted from the fixed DIDSON station in 2008, the first observation occurred on 13 July and the last on 23 August. There was one instance of two sturgeon observed simultaneously near one another in 2008. The majority of sturgeon movements in 2008 occurred from 1 to 3 August, immediately following a sturgeon spawning event estimated to have occurred on 31 July. In 2009, 210 sturgeon observations were observed with peak activity occurring 28 through 31 July. Eleven instances occurred when more than one sturgeon was sampled at the same time in 2009. Also in that year data were collected that appears to show a sturgeon releasing gametes. Sturgeon activity within the sample area generally increased during nighttime hours relative to daytime hours in all years. Hourly peaks in sturgeon observations occurred during the late evening in 2007, the early morning in 2008, and early evening in 2009. Mobile sampling detected a single sturgeon in 2007 and no sturgeon in 2008 (mobile sampling was not conducted in 2009.