Tag Archives: sockeye

Transboundary Sockeye Thermal Mark Recovery (ADFG Mark, Tag & Age Lab Support)

The Thermal Mark Laboratory at the ADF&G Mark, Tag and Age (MTA) Laboratory is responsible for examining sockeye salmon otoliths recovered from commercial fisheries in southeast Alaska for thermal marks indicating hatchery origin, and for making the associated data available to biologists for management of sockeye from the transboundary Taku and Stikine Rivers.

 

 

Mixed Stock Analysis of U.S. Districts 101, 102, and 103 Sockeye Seine Fisheries

Annual stock-specific run reconstructions (catch plus escapements) are required to accurately estimate relative contribution of each stock caught in Northern Boundary Area fisheries. Estimates of national origin of contributing stocks provides the most reliable information currently available to complete these run reconstructions, and are used to evaluate stock-specific productivity and revise pre-season forecasts. While the catch of Nass and Skeena sockeye salmon is only subject to treaty harvest-sharing annexes in the Alaska District 101 gillnet and Alaska District 104 purse seine fisheries, the harvest of these stocks in all fisheries, and their escapements, needs to be estimated in order to calculate the total run and the percentage caught in the annexed fisheries.
This project will complete genetic stock identification (GSI) analysis on sockeye salmon tissue samples collected from the 2016 commercial purse seine fisheries in Districts 101, 102, and 103 in Southeast Alaska. This project is a complement to the ongoing project at the Auke Bay Laboratory for Northern Boundary Area sockeye salmon GSI in Districts 101 and 104, and continuing work by DFO in Areas 3, 4, and 5; and will allow for complete assessment of the catches of Nass and Skeena sockeye salmon in all major Northern Boundary Area fisheries for run reconstructions. Estimates will be provided for up to 3 time strata in District 101, up to 3 time strata in District 102, and over the entire season in District 103, for a total of 1,500 samples analyzed.

Assessment of an Adaptive Resolution Imaging Sonar (ARIS) for fish counting in the Lower Fraser River

In the 2015 field season, the Pacific Salmon Commission’s Stock Monitoring Group leased an Adaptive Resolution Imaging Sonar (ARIS) system for counting fish passage and estimating behaviour and size distributions of salmon species at its hydroacoustic site on the Fraser River near Mission, B.C. The Southern Fund Committee (SFC) provided funding for this experiment, which demonstrated that the ARIS sonar was able to capture high-resolution images of fish targets allowing users to enumerate salmon passage and fish size at the site. As a new generation of imaging sonar, ARIS inherits many core technological features of the Dual-frequency identification sonar (DIDSON) while providing users with greatly enhanced and superior utilities for various needs, which will provide PSC with more accurate and precise estimates of near-shore salmon passage than the current split-beam system can ever achieve.
Sound Metrics Corporation (SMC), the parent sonar manufacturer of ARIS and DIDSON, has started to gradually phase out DIDSONs from the market. The imaging sonar systems are a very important component of the Mission hydroacosutics program, which have improved the accuracy of salmon-flux estimation in near-shore waters. Given the success of the 2015 pilot lease project noted above, the successful regional adoptions of ARIS for salmon enumeration in Alaska and Washington State, and PSC DIDSON units being beyond the manufacturer’s projected lifespan, we propose to modernize the Mission site and implement the ARIS imaging sonar into our daily estimation for the 2016 field program.

 

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 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. 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?

 

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.