July 6, 2022 — The contentious issue of chinook and chum salmon that are taken as bycatch in the Bering Sea pollock and groundfish trawl fisheries reached a new order of magnitude as the North Pacific Fishery Management Council grappled with concerns over declining salmon fisheries at its June meeting in Sitka.

The council and its scientific committees are no newcomers to the controversy pitting the Bering Sea trawl fleet against commercial and subsistence salmon fishermen along Alaska’s western coastline and the Yukon and Kuskokwim Rivers.

Genetic sampling and stock composition modeling of salmon caught in the trawl fisheries has been conducted by the National Marine Fisheries Service since 2011. Late last year ADF&G released new information to supplement those studies as an ongoing effort to combine state and federal scientific resources. “We want to work in a more unified front in presenting this information,” says Dianna Stram, a senior scientist with the North Pacific council, in Anchorage.

Random sampling of one in ten chinooks in 2021 rendered genetic material from 2,614 fish, of which 52 percent were linked to Coastal Western Alaska. The 52 percent was higher than the previous 10-year average of 44 percent. And of that 52 percent, an estimated 2 to 4 percent were headed to Middle and Upper Yukon River tributaries. Breaking those percentages down to the actual numbers of fish, scientists estimate that 16,796 chinooks were Coastal Western Alaska stocks, and of those, 670 chinooks were stocks bound for the Middle Yukon, with 729 fish headed for the Upper Yukon.

In response to the higher bycatch, the North Pacific council called upon Rachel Baker, who represents the State of Alaska in federal fishery management issues on behalf of ADF&G, to present a list of actions put forth by the council’s science and statistical committee.

Those actions include the implementation of new chum salmon avoidance strategies immediately; formation of a working group of scientists, fishermen and industry and tribal leaders to examine causes of declining western Alaska salmon; updating a 2012 analysis of chum salmon bycatch; and research focused on correlations between seawater temperature, forage species and young salmon.

Gruver and partner John Gauvin, fishery science project director with the Alaska Seafood Cooperative, have been working for years in the development of the salmon excluders used in trawls. Early models destroyed the netting in the trawls, or made the trawls fish incorrectly, which meant starting over on the new prototypes and subsequent test sessions in a giant glass tank made for trawl development in Newfoundland.

Gruver reports that the excluders had an 80 percent success rate in the Gulf of Alaska and ranged from 30 to 50 percent success rates during trials in the Bering Sea.

At the same time, many other salmon-dependent communities beyond 50 miles inland got cut out of the 10 percent allocated to CDQ groups. The seasonal run of chinooks and chums are all they have.

Read the full story at National Fisherman