Tag Archives: Indicator stock

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)

 

 

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)

 

 

Boundary Area Coho Escapement

The Hugh Smith Lake coho salmon population is substantially exploited by mixed-stock fisheries in both the U.S. and Canada and is, therefore, a key indicator stock used to monitor total adult abundance and escapements, and the pattern and intensity of exploitation by these fisheries on populations in the northern boundary area. It is the only system in the southern portion of Southeast Alaska where a total count (with back-up mark-recapture estimate) of coho salmon escapement has been routinely collected since 1982. Its location 70 km southeast of Ketchikan makes it a particularly strategic indicator stock for boundary area fisheries. It has also been one of three key indicator stocks used to measure the overall abundance of wild coho salmon available to the Alaska troll fishery and to measure the exploitation rate by the fishery.
Escapement projections are made from both the cumulative weir count and estimation models based on recovery of coded-wire tags to provide real-time information for management of fisheries for escapement. Peak helicopter survey counts at other Boundary Area streams provide an index with greater coverage that complements higher resolution assessment at Hugh Smith Lake.

N19-I04 Boundary Area Coho Escapement 2019 Report

N18-I03 Boundary Area Coho Escapement Report

N17-I04 Boundary Area Coho Escapement Report 2017

N16-I57 Boundary Area Coho Escapement Report 2016

 

Hugh Smith Lake Coho Smolt Enumeration and Marking

The Hugh Smith Lake coho salmon population is substantially exploited by mixed-stock fisheries in both the U.S. and Canada and is, therefore, a key indicator stock used to monitor total adult abundance and escapements, and the pattern and intensity of exploitation by these fisheries on populations in the northern Boundary Area. Its location 70 km southeast of Ketchikan makes it a particularly strategic indicator stock for boundary area fisheries. It has also been one of three key coded-wire tagged indicator stocks used to measure the exploitation rate by the Alaska troll fishery and to estimate the overall abundance of wild coho salmon available to the fishery. Timely escapement projections are made from both the cumulative weir count and estimation models based on recovery of coded-wire tags to provide real-time information for management of fisheries for escapement goals.
The Hugh Smith Lake coho salmon population has been the only long-term, continuously operated wild coho indicator stock project in the northern boundary area, with a record of catch, escapement, smolt production, marine survival, and age composition estimates dating from 1982. The proposal would continue to fund operation of a smolt weir to enumerate and coded-wire tag coho salmon smolts emigrating from Hugh Smith Lake to generate total population estimates, including total smolt production, marine survival, exploitation rate, and catch by area, time, and gear type. Coho smolt estimates and tag recovery rates in the Southeast Alaska troll fishery will be used to generate inseason estimates of marine survival and total adult abundance for fishery management. Estimates of brood year smolt production and adult return by age class will be used to evaluate and refine the biological escapement goal. Counts and samples of sockeye salmon smolts are also obtained at the smolt weir and have been used to evaluate escapement goals and effectiveness of sockeye salmon stock enhancement efforts. The proposed project will continue a core stock assessment program needed to manage fisheries for coho salmon in the northern Boundary Area.

N16-I58 Hugh Smith Lake Coho Smolt Estimation and Marking Report Year 1 of 2