Tag Archives: mark/recapture

Babine River Sockeye Migration and Predation Assessment

Lake Babine Nation Fisheries (LBNF) plans to work with Fisheries and Oceans Canada (DFO) to continue the investigation of the behaviour and ecology of Babine River sockeye fry. The proposed project is composed of four relatively discrete components which include:

  1. early life history behaviour and migration;
  2. extent and rate of predation on juvenile sockeye;
  3. egg-to-fry and fry-to-smolt survival, frequency of occurrence of disease and parasites and condition as a function of length and weight; and
  4. presence and behaviour of sockeye fry rearing in downstream slow water habitats to obtain evidence of a riverine juvenile sockeye ecotype.

Other observed adverse effects that may affect sockeye fry survival and overall sockeye production will be documented. These studies are intended to address the diminished abundance of Late Run Upper and Lower Babine River sockeye in their juvenile freshwater environment.

N16-I27 Babine River Sockeye Migration and Predation Report 2016. Year 2 of 3

N15-I55 Babine River Sockeye Migration and Predation Report. Year 1 of 3

 

 

Burman River Chinook Salmon Mark-Recapture

Concern for West Coast Vancouver Island (WCVI) natural Chinook currently limits PSC fisheries in Southeast Alaska, the Haida Gwaii recreational fishery and particularly the Area F troll fishery in northern British Columbia and troll fisheries and some recreational fisheries on the WCVI. Although the Burman River is enhanced, the population is of sufficient size to estimate the escapement with precision, and thermally marked otolith sampling provides an estimate of the naturally spawned fraction.
The program will estimate the escapement of adult Chinook salmon to the Burman River, a PSC Chinook escapement indicator, using both closed population and open population mark-recapture techniques refined between 2009-2014. The project will also quantify age, sex and origin compositions. Estimates of abundance of the thermally marked hatchery fraction combined with a precise escapement estimate will provide important information to verify and support the WCVI Aggregate ratio estimation project by providing an independent reference point (the Burman River Chinook hatchery fraction, independent of Robertson Creek Hatchery stock) in the northern WCVI area.

S18-VHP11 Spawning escapements and origin of Chinook salmon at Burman River Report 2018

S17-VHP13 Burman River Chinook salmon mark-recapture 2017

S16-I17 Burman River Chinook Salmon Mark-Recapture Report 2016. Year 8

S15-I06 Burman River Chinook Salmon Escapement Indicator Mark-Recapture Experiment, 2015. Year 7

S14-I13 Burman River Open population mark-recapture estimation of ocean-type Chinook spawning escapements WCVI Report 2014

SSP13-01 Burman River Chinook Salmon Total Escapement Estimation Project, 2013

SSP12-01 Preliminary - Burman River Chinook Salmon Total Escapement Estimation Project, 2012

SSP11-06 Burman River Chinook Salmon Total Escapement Estimation Project, 2011

SSP10-03A Burman River Chinook Salmon Total Escapement Estimation Project, 2010

SSP-1A/B Burman River Chinook Salmon Total Escapement Estimation Project, 2009 (Year 1)

 

 

Chinook Salmon Escapement Estimation to the Skeena River Using Genetic Techniques

The Skeena River is host to the second largest aggregate of Chinook salmon in British Columbia. While the aggregate is a PSC escapement indicator stock, there are no biologically based escapement goals for this population. This project provides an annual escapement estimate for the aggregate as well as for the large component stocks. The estimate produced is comparable with the historic estimates produced using an estimate of variance. The Tyee Test fishery, which has been conducted since 1955, provides data such as age information that is matched to the genetic information. The combination of stock specific escapements with age composition forms the basis for escapement goals and benchmarks.
The Kitsumkalum River hosts one of the major Chinook populations in the Skeena watershed, and is a PSC exploitation rate indicator stock. The mark-recapture estimate produced in in a separate project forms the cornerstone for the expansions of the stock compositions observed at the Tyee Test fishery.
The project consists of genetic analyses of samples from Chinook salmon caught at the Tyee Test fishery, and escapement data from the Kitsumkalum mark-recapture program. Chinook salmon scale samples will be collected from the Tyee Test Fishery and the DNA from the samples will be compared against genetic baselines from Skeena Chinook salmon populations. The proportion identified as Kitsumkalum Chinook will be expanded to generate escapement estimates for the Skeena River aggregate using the mark-recapture estimate of escapement for the Kitsumkalum population.

N19-I34 Chinook Escapement Estimation to the Skeena River Using Genetic Techniques 2019

N18-VHP09 Chinook Escapement Estimation to the Skeena River using Genetic techniques Report 2018

N17-VHP13 Chinook Salmon Escapement Estimation to the Skeena River Using Genetic Techniques Report 2017

N16-I33 Chinook Salmon Escapement Estimation to the Skeena River Using Genetic Techniques 2016. Year 8

N15-I27 Chinook Salmon Escapement Estimation to the Skeena River Using Genetic Techniques 2015. Year 7

SSP14-09 Chinook Salmon Escapement Estimation to the Skeena River Using Genetic Techniques 2014. Year 6

SSP13-06 Chinook Salmon Escapement Estimation to the Skeena River Using Genetic Techniques 2013

SSP12-05 Chinook Salmon Escapement Estimation to the Skeena River using Genetic Techniques 2012. Year 4

SSP11-01 Chinook Salmon Escapement Estimation to the Skeena River Using Genetic Techniques 2011. Year 3

SSP10-01 Chinook Salmon Escapement Estimation to the Skeena River Using Genetic techniques 2010. Year 2

SSP-4 Chinook salmon Escapement Estimation to the Skeena River using Genetic techniques (Year 1)

 

 

Tatsamenie Lake Sockeye Fry Extended Rearing and Smolt Enumeration

A sockeye enhancement program has been ongoing at Tatsamenie Lake since 1990. A review of the program was funded by the Northern Fund in 2005, and in 2008, the Northern Fund began supporting the Extended Sockeye Fry Rearing Project.
The fry were originally reared in lake pens, but because of a devastating disease outbreak, the project shifted to onshore rearing systems beginning in 2009. The egg to smolt survivals of the fed fry have been variable but have ranged from 10% to 70%, or 5 to 15 times compared to wild fry, depending on fry behaviour after outplanting. Assessment of adult production from this project is ongoing. Smolt to adult survivals of the reared fry will be definitively determined with the return of the corresponding adults in the coming years, but to date, the adult production from reared fry has been lower than expected. This project continues to test a technique that has the potential of increasing production for other small scale sockeye salmon enhancement projects as well as rebuilding the Tatsamenie Lake sockeye stock in low brood year cycles.
Also at Tatsamenie Lake, the Canadian Department of Fisheries and Oceans began a smolt enumeration program in 1996, and this ran continuously from 1998 through to 2011. The Northern Fund began supporting this program in 2012, and the two programs were combined in 2015. The combination allowed the Tatsamenie Lake sockeye smolt mark-recapture project to extend beyond its previous end date of June 30, through to the second week of September. This provides a more accurate smolt population estimate as well as increased precision of the estimated enhanced sockeye survival and production. This also allows for monitoring of potential early out-migration of the reared fry.

N19-E02 Tatsamenie Lake Sockeye Fry Rearing and Smolt Projects 2019 Report

N18-E07 Tatsamenie Lake Sockeye Fry Rearing and Smolt Report

N17-E01 Tatsamenie Lake Rearing Final Report

N16-E01 Tatsamenie Lake Sockeye Fry Rearing and Smolt Projects 2016

N15-E01 2015 Tatsamenie Lake Sockeye Fry Extended Rearing and Smolt. Year 11

N14-E01 2014 Tatsamenie Lake Sockeye Fry Extended Rearing. Year 10; N14-E06 2014 Tatsamenie Lake Smolt Project. Year 3

N13-E02 2013 Tatsamenie Lake Sockeye Fry Extended Rearing. Year 9

N13-E07 2013 Tatsamenie Lake Smolt Project. Year 2

Calibration of Assessment Methods for Fraser Sockeye Enumeration

Since 2007, with support from the Southern Boundary Restoration and Enhancement Fund, calibration work has been conducted on twenty-five Sockeye populations of various stream types in the Fraser and has led to the development of indices for aerially surveyed Sockeye populations on the following three stream types: i) medium sized, clear streams, ii) medium sized, partially turbid/tannic streams and iii) large sized, clear streams. Although this represents substantial progress, significant gaps still exist on the remaining stream types and lake spawning populations. Calibration work involves the comparison between estimates generated using high precision enumeration techniques (enumeration fences, sonar, and/or mark-recapture programs) and those generated using standard low precision visual techniques. As annual calibration opportunities on target populations are limited, calibration work over the long term will be required to satisfy the data requirements for all stream types.  The actual populations to be calibrated will be determined based on in-season estimates of abundance.

S18-FRP03 Calibration of Visual Assessment Methods for Fraser River Sockeye Salmon (Oncorhynchus nerka)

S17-I06 Calibration of Visual Assessment Methods for Fraser River Sockeye Salmon Year 9

S16-I21 Calibration of Visual Assessment Methods for Fraser River Sockeye Report 2016

S15-I01 Calibration of Assessment Methods for Fraser Sockeye Enumeration 2015. Year 7

S14-I02 Calibration of Assessment Methods for Fraser Sockeye Enumeration 2014. Year 6

S13-I01 Calibration of Assessment Methods for Fraser Sockeye Enumeration 2013. Year 5

S12-I02 Calibration of Assessment Methods for Fraser Sockeye Enumeration 2012. Year 4

S11-I04 Calibration of Assessment Methods for Fraser Sockeye Enumeration 2011. Year 3

S10-I05 Calibration of Assessment Methods for Fraser Sockeye Enumeration 2010

S07-I05 Calibration of Assessment Methods for Fraser Sockeye Enumeration 2007

 

Atnarko River Chinook Escapement Estimation

The Atnarko River was identified as a potential escapement and exploitation rate indicator for Central BC early summer Chinook, and in 2009 the Atnarko River Chinook stock was proposed as an exploitation rate indicator. It was funded under the Coded Wire Tag (CWT) Improvement program, and the purpose of the five-year mark-recapture program was to improve escapement estimates for early summer Chinook.
Since then, the program has met the data standard of a coefficient of variation (CV) of 15% or less. Continued mark-recapture estimates on the Atnarko River will build on the information thus far. The project will estimate the escapement of Chinook salmon and generate estimates such that the fraction of CWT fish is known relative to the wild and/or unmarked escapement, and this data is essential for Chinook run reconstruction calculations. This program is part of a comprehensive group of programs on Atnarko River Chinook salmon that includes the production of Chinook fry and CWT application (under separate submission to the Northern Fund) and terminal fishery monitoring.

N18-VHP12 Atnarko River Chinook Salmon Spawning Escapement Estimation Final 2018

N17-VHP05 Atnarko River Chinook Salmon Spawning Escapement Estimation Report 2017

N16-I30 Atnarko River Chinook Escapement Estimation Report 2016. Year 3

N15-I33 Atnarko River Chinook Escapement Estimation 2015. Year 2

N14-I33 Atnarko River Chinook Escapement Estimation 2014. Year 1

Alsek Sockeye Run Reconstruction

Weir counts have been made on the Klukshu River, part of the Alsek River system, by the Department of Fisheries and Oceans (DFO) in co-operation with the Champagne-Aishihik First Nation, since 1976. A mark-and-recapture program ran from 2000 to 2004, and in 2005 and 2006, the Alsek sockeye population was estimated using tissue sample and catch information from the commercial sockeye fishery in Dry Bay as well as the weir counts. By recommendation by the Northern Fund Committee in 2008, a statistically valid sampling strategy that would provide the foundation for reconstructing sockeye and Chinook returns to the Alsek River was completed. Based on this model, it was proposed that funding be provided to analyze sockeye tissue samples collected in the commercial sockeye fishery in Dry Bay (up to 750 per season), to reconstruct the Alsek sockeye runs as described in Gazey’s analysis. The program has been running successfully each season since 2012.

N17-I16 Alsek Sockeye Run Reconstruction 2017

N16-I49 Alsek Sockeye Run Reconstruction Using GSI 2016

N15-I11 Alsek Sockeye Run Reconstruction 2015. Year 4

N14-I10 Alsek Sockeye Run Reconstruction 2014

N13-I12 Alsek Sockeye Run Reconstruction 2013

N12-I17 Alsek Sockeye Run Reconstruction, 2012

 

 

Alsek Chinook Run Reconstruction

Since 1976, weir counts have been made on the Klukshu River, part of the Alsek River system, by the Department of Fisheries and Oceans (DFO) in co-operation with the Champagne-Aishihik First Nation. In 2007, the weir counts at Klukshu, in conjunction with Chinook catches from the test fishery at Dry Bay, were used to estimate the Alsek Chinook population. The results were encouraging, and by recommendation by the Northern Fund Committee in 2008, a statistically valid sampling strategy that would provide the foundation for reconstructing the Chinook return to the Alsek River was completed. Based on this model, it was proposed that funding be provided to analyze Chinook tissue samples collected in the commercial sockeye fishery in Dry Bay (up to 500 per season), to reconstruct the Alsek Chinook runs as described in Gazey’s analysis. The project was carried out successfully in 2014, but there has not been enough fish in 2015 and 2016.

N14-I32 Alsek Chinook Run Reconstruction 2014

 

Babine Lake Sockeye Smolt Enumeration – Mark-Recapture

The Lake Babine Nation Fisheries Department (LBNF), in collaboration with the DFO, propose to build on success in the 2013 – 2019 smolt project by continuing to operate the Babine smolt enumeration facilities to provide sockeye smolt emigration estimates and smolt fitness data for the Babine Lake Watershed. Smolt production and fitness are effective indicators of Babine Lake ecosystem health which can be used to initiate and direct resource management initiatives intended to protect the Babine Lake watershed. Continued smolt trap operation would extend the data series analyzed by the DFO from 1959 to 2002, jointly by the LBN and SFC from 2013 to 2015 and independently by LBNF from 2016 to 2019. We believe that continuous data from the Babine smolt enumeration fence would provide important information on Babine sockeye population status that will contribute critical information to the understanding the large inter-annual variations in returns observed in the past two decades. An uninterrupted set of sockeye smolt population data over multiple years will help address one of the most fundamental questions of salmon stocks management — under which conditions are freshwater or marine environments the primary driver determining salmon returns?  We propose to continue the Babine sockeye smolt enumeration program in 2020 to continue monitoring smolt production, which is necessary to determine the effects of annual variation in climactic conditions, habitat conditions and prey availability.

N19-I42 Babine Lake Watershed Sockeye Smolt Enumeration Project – Mark-Recapture 2019 Report

N18-I33 Babine Lake Watershed Sockeye Smolt Enumeration Project – Mark-Recapture Report 2018

N17-I31 Babine Lake Watershed Sockeye Smolt Enumeration Project – Mark-Recapture

N16-I10 Babine Lake Watershed Sockeye Smolt Enumeration Project – Mark-Recapture 2016

N15-I17 2015 Babine Lake Sockeye Smolt Enumeration – Mark-Recapture. Year 3 of 4

N14-I15 Babine Lake Sockeye Smolt Enumeration – Mark-Recapture. Year 2 of 4

N13-I22 Babine Lake Sockeye Smolt Enumeration - Mark-Recapture Year 1 of 4