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Alaska Fish & Wildlife News
Sockeye Run Breaks All Records
Alagnak River escapement issue
In August of 2004, millions of salmon escaped into the Alagnak River system but failed to spawn. This was frustrating to fishery managers and fishermen alike.
The Kvichak River and the Alagnak River drain into Kvichak Bay, site of the Naknek–Kvichak fishery district, which is part of the Bristol Bay sockeye salmon fishery. Half of the world’s sockeye are caught in Bristol Bay—and half of the Bristol Bay catch has historically been caught in the Naknek–Kvichak fishery district.
“It’s one of the most important salmon fisheries in the world,” said John H. Clark, chief fisheries scientist with the Alaska Department of Fish and Game.
Fisheries managers set escapement goals to ensure that harvests are sustainable - escapement refers to the fish that are allowed to “escape” the fishery and enter the river to spawn.
Since 1973, the escapement goal for the Alagnak River has been 185,000 sockeye. However, the actual escapement numbers have steadily risen over the years, culminating in a massive over-escapement of more than 3.6 million fish in 2003 (20 times the escapement goal), and almost 5.4 million fish (30 times the escapement goal) in 2004. At the same time, the Kvichak stock numbers have declined since the mid 1990s. This year, the Kvichak River escapement fell short of its goal by 313,000 salmon.
Fishery management has restricted ocean harvests based on Kvichak River stock. However, managing for Kvichak stock over the past few years has virtually guaranteed over-escapement in the Alagnak River.
The Alagnak River system cannot handle such a huge number of spawning fish. In addition to the crowded conditions resulting from massive over-escapement, there is limited suitable spawning habitat. Clark and several fellow fisheries scientists took egg samples from the females and determined that in some areas only 14% of the female salmon had successfully “spawned out.” In the Moraine Creek area, where up to 60% of females successfully spawned in late August, the stream level dropped by about one-third over the next two weeks, killing many of the eggs.
Fish and Game data for the Alagnak River
In addition to the Alagnak River sockeye stock being managed for the declining co-migrating Kvichak River stock, escapement numbers in the Alagnak River were seriously underestimated for many years.
From 1955 to 1976, Fish and Game Annual Management Reports had escapement numbers from both tower counts and aerial survey counts. For the years that both tower counts and aerial survey numbers are available, aerial surveys represented 20–70 percent of the tower count, which averaged out to an expansion factor of 2.55. According to Clark, tower surveys are more accurate than aerial surveys, although undercounting may occur due to water clarity, light conditions, or fish swimming too far from shore to be counted.
From 1977 to 2001, fish were counted by aerial survey only. The 1977 aerial survey was extrapolated; however, aerial survey escapement counts from 1978 to 2001 were not. From 1977 to 2001 escapement abundance was most likely underestimated by an average factor of 2.55.
From 2002 to 2004, fish were again counted by both tower and aerial surveys. The tower was moved up the river, where visibility is better, to obtain a more accurate count.
The escapement underestimation goes beyond this, however. In Clark’s report Abundance of Sockeye Salmon in the Alagnak River System of Bristol Bay Alaska he states, “… the use of this faulty assumption over a 24 year history has undoubtedly introduced errors into a variety of information and statistics that are critically important to current day fishery management in Bristol Bay.”
Social factors in fishery management
In October of this year, the King Salmon Village Council submitted an Agenda Change Request to the Board of Fisheries. An Agenda Change Request asks that a fishery concern be discussed outside of its regular cycle; each fishery comes up for discussion every 3 years. Bristol Bay is not up for discussion until 2006.
The Agenda Change Request asked the Board of Fisheries to develop an optimum escapement goal for the Kvichak River or combine Kvichak and Branch (Alagnek) rivers for one escapement number with an optimum escapement goal. Many of their tribal members are fishermen and are feeling the economic pinch of fishing restrictions due to declining Kvichak River stock. In 2003 Kvichak River sockeye was elevated to a “stock of management concern” by the Board of Fisheries. The Agenda Change Request was denied.
“I think we’ve got enough problems with Kvichak without creating more, and based on everything I’ve heard, unfortunately I don’t see that this is an answer to being able to get at those Alagnak River fish. It seems to me that we’re still having a problem of getting these fish up the Kvichak,” said Melvan Morris, board member from Kodiak.
Dr. Fred Bouse, board member from Fairbanks, added “We do have a lost opportunity to harvest those fish. But we don’t want to further endanger the Kvichak. I can’t find any way to do that – not yet.” He conceded that this was a lost harvest opportunity and would like this issue addressed in the future.
There is currently a petition to the Board of Fisheries by Al Bauman of the Kvichak Set Netters Association to allow inriver fishing in the Alagnak River, but no decisions have been made on that yet.
What is being done?
This year Fish and Game received $70,000 in research and development funds from the Fisheries Revitalization Strategy to study the Alagnak River over-escapement. This one-time grant of federal disaster funds will be used to study the effects of the enormous excess escapement.
The study, which began in August and is conducted by ADF&G Commercial Fisheries Division staff, will gather data on spawning distribution, pre-spawning mortality, egg retention, nutrient and plankton levels, and smolt production.
Clark suggests that the Alaska Department of Fish and Game should give more consideration to a fishery management solution that includes the Alagnak River sockeye stock, and give serious consideration as to how best to sustain the salmon fisheries of Bristol Bay given that the Alagnak stock of sockeye salmon is currently one of the largest runs of fish in the Bristol Bay area.
“We need to figure out the best mix to achieve reasonable conservation goals,” Clark said.
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Juneau, AK 99811-5526