Cowlitz River smelt data suggest run may be rebounding

2012-03-29T20:00:00Z 2012-04-02T08:53:51Z Cowlitz River smelt data suggest run may be reboundingBy Tom Paulu / The Daily News Longview Daily News
March 29, 2012 8:00 pm  • 

Dalton Fry cast a finely meshed net into the murky Cowlitz River. He waited a few minutes, then hauled it in and poured the contents into a glass jar. There swam dozens of smelt larvae, their eyes protruding from barely visible bodies.

"There's probably 100 in there, no problem," Fry, who works for the Cowlitz Indian Tribe, said last week.

Seals swimming nearby off the boat launch at Gerhart Gardens indicated that adult smelt were cruising the river, too.

This time of year, smelt larvae and adults are coursing through lower Columbia watershed. The run apparently lasts longer and the fish are swimming farther up rivers than biologists previously believed.

There are indications that the run is rebounding, too.

But that doesn't mean dipping for the once-plentiful fish will be reinstated any time soon. Two years ago, smelt were listed as threatened under the federal Endangered Species Act (ESA), and the Washington and Oregon departments of fish and wildlife haven't allowed sport or commercial dipping since.

Researchers for Washington, Oregon and the Cowltz Tribe are in the second year of research projects about smelt and still have years of study to do before developing a reliable way to count the oily fish.

The states are focusing on smelt in the Columbia River while the tribe, fittingly, is doing much of its work in the Cowlitz River.

For decades, fish managers admitted that they didn't know much about smelt — and didn't really need to.

The fish kept returning every year in big enough numbers for dippers to fill their buckets. When a major smelt run appeared in February or March, dippers would line the banks of the Cowlitz River into the wee hours, creating so much noise that Kelso finally asked the state to prohibit dipping after 10 p.m.

However, smelt runs on the Cowlitz and other local rivers started to falter in the 1980s, and the last decent run was in 2003. Smelt were also faltering on coastal rivers from California to British Columbia. In 2007, The Cowlitz Tribe petitioned to have the fish listed under the federal ESA, and the National Marine Fisheries Service listed them as threatened in March of 2010.

Before the listing, "there was no money to monitor smelt because it was just a bait fish," said Chris Wagemann, a WDFW smelt researcher.

But where there's an endangered species, there's federal research money. In 2010, NMFS awarded $1.6 million to the Oregon and Washington DFWs and another $811,306 to the Cowlitz Tribe for three years of research. The funding for next year's research, however, has been cut by about 70 percent.

Smelt found on 14 tributaries

During the smelt run, tribal workers leave devices similar to crayfish traps in rivers overnight to capture adult smelt. They also use plankton nets to catch larvae and eggs.

"We're trying to establish the upstream extent they use for spawning," said Craig Olds, lead smelt biologist for the tribe.

On the Cowlitz, Fry can leave a net in the water for only a few minutes. "Your whole net will be full of sand if you do it too long," he said.

Despite the river's murkiness, the water samples taken at Gerhart Gardens were rich with smelt larvae. "This is a tremendous spawning area," Olds said. "We don't know how far up, but it probably extends all the way to the Toutle River."

Research done so far indicates that smelt populate more streams that previously thought. The Cowlitz run is well known, and so are occasional runs in the North Fork Lewis River. However, when the fish appeared in other streams, they were thought to be strays from the mainstem Columbia.

But last year the Cowlitz Tribe trapped adult fish in the Grays, Elochoman, Toutle, Kalama and East Fork Lewis rivers, along with Skamokawa Creek. Researchers also found evidence of smelt spawning in Abernathy, Germany and Mill creeks. Altogether, tribal researchers found evidence of smelt in 14 Columbia River tributaries.

"We found they can use all the tributaries and much higher upstream than had been documented," Olds said. For instance, smelt larvae were found in the Cowlitz as far upstream as Blue Creek at the lower hatchery.

The tribe plans to expand its sampling into the South Fork of the Toutle. "We think there may be spawning activity up there," Olds said.

"There was a distinct run in the Kalama this year," Fry said. "I haven't seen smelt in the Kalama in a long time." Researchers found smelt larvae 8 miles up the Kalama, to what anglers call the Red Barn Hole.

Several other Indian tribes and the Oregon DFW are doing smelt research in coastal streams.

Smelt run hard to count

One of the WDFW researchers' goals is developing an accurate method of measuring the size of the smelt run in tons, based on the number of eggs and larvae.

In past years, the best gauge was the amount of commercial catch, which was partially influenced by the market for bait and zoo feed. But with all smelt fishing prohibited, commercial landings are no longer an option to measure the run size.

With salmon and steelhead, biologists can observe spawning sites in tributaries and count the number of fish returning to hatcheries and crossing Columbia River dams. Hatchery salmon smolts are implanted with tiny wire tags that scientists can track out into the ocean.

But smelt spawn out of sight at the bottoms of rivers and don't reach hatcheries — and their larvae are obviously too tiny for wire tags.

"There's no run for us to go out and count," said Phillip Dionne, a WDFW researcher. "The fish are small. We can't handle them. There's not fisheries on them any more."

The Washington DFW has a three-person smelt research team focusing on sampling eggs and larvae in the Columbia River near Cathlamet. Several times a week, Wagemann heads out onto the river on a boat and drops a plankton net overboard for three to five minutes.

Back at the lab, workers pour water samples into dishes and peer at them through a magnifying glass. "Our technicians spend hours and hours and hours and hours looking through microscopes" to count the eggs and larvae, Dionne said. The Cowlitz Tribe has a similar lab.

Another part of the research is dipping mats that smelt eggs adhere to into the river.

Factors in the population equation are the male-female sex ratio and how many eggs a female produces, which is thought to range from 20,000 to 60,000. "There's still a lot of questions about how confident we are about the sex ratio and the fecundity," Dionne said.

The Northwest Fisheries Science Center at Point Adams near the mouth of the Columbia is testing the use of sonar to measure the smelt run, similar to the way commercial fishermen use the technology to find schools of herring.

Biologists have been surprised to learn just how early smelt begin to appear in the Columbia River. They used to think that a pilot run of smelt appeared in December, followed by the main run in February, "typically around Super Bowl time," Wagemann said.

However, the biologists found smelt larvae in the Columbia last December, which means the smelt would have spawned about 30 days earlier. Next year, they'll start searching for larvae in November.

Counting the bycatch

Smelt researchers are also working on the high seas, where the fish have been caught and discarded as bycatch on shrimp trawlers. In the past, "nobody has ever been looking at ocean shrimp trawlers to see what they were doing," said Olaf Langness, also a WDFW biologist. Now, WDFW observers are riding along, gauging the amount of smelt bycatch.

The Oregon DFW has developed an excluder that separates shrimp and smelt. (See sidebar) Shrimp fishermen welcome the device, Dionne said. "It really cleans up their catch and saves them so much time and sorting afterwards."

Don't dust off the dip nets yet

Last October, the federal NMFS established "critical areas" for smelt, including 335 river miles.

The critical area finding won't affect anglers and owners of riverside property much, because the waters are already critical habitat for other species of fish listed under the ESA, according to NMFS.

"Many of the things that protect salmon and steelhead also protect smelt," Olds said.

However, the smelt listing could affect Columbia River dredging by the Corps of Engineers because smelt larvae tend to congregate deep in the river and can be sucked up by dredging hoses.

The Corps expects to receive a new biological opinion on smelt from NMFS in the next couple of months, according to Corps spokeswoman Michelle Helms. "When that comes out, we'll have a better understanding of what it means to our dredging operations," she said.

Smelt may also affect the operation of dams on the Cowlitz and Lewis rivers. "We think one of the major things that influence smelt runs is river flow," Olds said.

When smelt dipping will resume depends on the outcome of the research.

Fishing of course is allowed for hatchery salmon and steelhead, even though the wild component of those runs is ESA-listed. But all smelt are wild, naturally spawning fish — and no one is proposing raising them in hatcheries. So dipping will only return when fishery officials believe the runs are strong enough to support it.

"It usually takes decades to de-list a species — unless it didn't belong on the list to begin with," Dionne said.

Don't expect to dust off the dip nets for a while, even if the runs appear to be getting better.

As anyone who watched the Cowlitz River in mid-February could tell you, a good slug of smelt were in the river, attracting birds and seals. This year's run appeared to be better than last year's, which looked like a stronger run than the year before, Dionne acknowledged.

"This may be a better year, but if you look back to the 1980s, a good year now would be a bad year then," he said.

Copyright 2015 Longview Daily News. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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