Tag Archives: northern pike

Lake Washington Walleye Outfitted With Acoustic Tags For Study

Fishery biologists with a Seattle-area tribe are capturing a new predator species in Lakes Washington and Sammamish to monitor their movements and whether they cross paths with salmon.

It’s unclear how many of the illegally introduced fish are actually in the system, but concern is building and the Muckleshoot Tribe reports they have “successfully tagged and released multiple walleye” already this year.

STATE FISHERIES BIOLOGIST DANNY GARRETT DISPLAYS A 13-PLUS-POUND WALLEYE HE UNEXPECTEDLY CAUGHT IN 2015 NEAR MERCER ISLAND ON LAKE WASHINGTON. (WDFW)

A request for comment from the tribe had not yet been returned as of this writing, but details of the operation come from the LOAF, or list of agreed-to fisheries that was signed by WDFW and the Northwest Indian Fisheries Commission earlier this month as the parties reached an agreement at North of Falcon, and which was posted last week by the state agency.

Besides outlining all the treaty, commercial and recreational salmon fisheries over the coming 12 months, the 105-page document includes the Muckleshoot’s aims and methods for their two-year warmwater species study in the Lake Washington basin.

It builds on the scant information we were able to report earlier this year, when it began.

The tribe says it wants to catch up to 15 walleye to “assess their overlap with migrating juvenile salmonids in addition to locating areas these invasive predators may be targeted in subsequent fisheries.”

Tribal fishers are targeting one of seven zones in Washington and Sammamish at a time, using up to eight 300-foot-long gillnets with 31/2- to 6-inch mesh. The nets fish during the work week and are closely monitored to reduce the possibility of snagging the few if any ESA-listed steelhead in the basin.

Walleye are being implanted with acoustic devices that can be read by receivers stationed around the lakes that are otherwise used to track tagged returning adult Chinook and sockeye and young outmigrating coho.

Overlapping walleye movements with the coho will help model their potential to cross paths with Endangered Species Act-listed Chinook smolts.

The Muckleshoots say their effort “will benefit salmonid management in the Lake Washington basin,” as well as inform researchers on walleye diets and distribution.

Of note, a “second consideration” is to figure out if catch rates on walleye and bass are “high enough to result in an economically viable fishery … Data collected will inform managers of areas and times that a tribal net fishery could be economically viable as well as areas to avoid/target minimizing bycatch and optimizing harvest.”

According to plans, gear, locations and effort may be shared with the National Oceanic and Atmospheric Administration, along with details on any steelhead or Chinook caught, with the test fishery being shut down after a third and fifth of each species is encountered.

The data will add to a 2004-05 Army Corps of Engineers study that looked at movements of acoustically tagged Chinook smolts, smallmouth bass and prickly sculpins.

Walleye first turned up in Lake Washington in 2005, a small male, caught by University of Washington researchers, with anglers catching one or two in following years.

But in 2015, state and tribal biologists caught a dozen, mostly in Lake Washington between Mercer Island and Bellevue, including a 13.5-pound hen that was dripping eggs.

As the species is native to waters east of the Rockies, the only way they could have arrived in the urban lakes is in livewells. The nearest source populations are about 120 miles east on I-90 in the Columbia Basin.

The Lake Washington system supports important tribal and recreational salmon fisheries, though sockeye, which reside in the lake a year before going to sea, have not produced directed seasons for over 10 years, despite a new hatchery. WDFW’s Issaquah Salmon Hatchery produces Chinook and coho.

So far, the Muckleshoots have caught at least one northern pike in Lake Washington, as well as a handful of walleye in Lake Sammamish.

The LOAF also describes a plan to electrofish in spring and fall and gillnet in spring in select areas of Lake Washington and the Ship Canal, the idea being to figure out if removing bass, walleye, perch and other salmon predators can be effective.

One thing’s for sure, if you’re a bass tournament angler fishing nationally ranked Lake Washington, you’d want a map of where those efforts are planned.

FDR Pike Numbers Up As State-Tribal Removal Efforts Intensify

Ten times more “nightmare fish” — northern pike — than last March were caught earlier this month on Lake Roosevelt, including a 20-pound hen carrying eggs that made up roughly a tenth of its body weight.

The unwanted invasive species is the target of stepped-up gillnetting by the Colville and Spokane Tribes, and removal by Washington Department of Fish and Wildlife staffers, who say that this year through March 28, 338 have been taken out of the large reservoir at the head of the Columbia River in Washington.

COLVILLE TRIBES MEMBER ROBERT THOMAS HOLDS UP THE 20-POUND FEMALE NORTHERN PIKE GILLNETTED EARLIER THIS MONTH OUT OF LAKE ROOSEVELT. (BRYAN JONES, COLVILLE TRIBES)

The worry is that, just as pike got loose out of the Pend Oreille River system into Roosevelt, they’ll get out of FDR and into the salmonid-rich Columbia below Lake Rufus Woods.

Managers are increasing their efforts to head them off as they inexorably move that way.

“To date, northern pike appear to be distributed primarily in the Kettle Falls area  — near the mouths of the Colville and Kettle Rivers, Singers Bay, Evans — but juveniles were caught further south, near Bradbury launch, for the first time recently,” says Bill Baker, a WDFW fisheries biologist based in Colville.

He says that 2016 saw recruitment of a “measurable year-class,” along with “confirmed successful spawning” in the Kettle and probably Lake Roosevelt too.

A NORTHWEST POWER AND CONSERVATION COUNCIL IMAGE SHOWS MULTIPLE YEAR-CLASSES OF NORTHERN PIKE GILLNETTED OUT OF THE COLVILLE RIVER EARLIER THIS MONTH, “EVIDENCE THE POPULATION IS GROWING,” ACCORDING TO A BLOG POST FROM THE REGIONAL GROUP. (COLVILLE TRIBES)

“Many of the northern pike caught thus far this year are from that year class, around 16 to 17 inches on average. However, there are some large adults present, as well,” Baker says.

According to a mid-March Northwest Power and Conservation Council blog by spokesman John Harrison and headlined simply “Nightmare Fish,” the gonads on that hefty hen weighed 2.2 pounds and were “stuffed” with eggs.

WDFW began looking for concentrations of pike in February for the tribes to net this month. Gillnetting now gets ahead of the May-June spawn.

Baker says that this year’s netting effort is larger than 2016’s, so it’s hard to compare overall removal numbers from year to year, but he feels the catch rate is up, probably because of more pike in the lake but also a better understanding of where they like to hang out.

“Last year’s efforts informed where and when to net this year,” he says.

Bycatch has been “low,” he says, with walleye and redband rainbows comprising 8 and 5 percent of the overall haul.

Those fish are released alive as much as possible, and that’s being helped by cold water temperatures, he says.

If there’s good news, it’s that removal efforts in the Pend Oreille River reservoirs by the Kalispel Tribe appear to have pinched off those waters as a source of pike for FDR through entrainment during high-runoff years, such as 2011, when they first came to widespread attention after an angler caught one near Kettle Falls.

But unfortunately, the Canadian Columbia now has established pike schools, and “in-reservoir recruitment appears to now be the major driver for population expansion within Lake Roosevelt,” says Baker.

Northerns likely originally came down the Pend Oreille from the Clark Fork and Northwest Montana, where they were illegally introduced over the continental divide by bucket biologists.

State, tribal and Columbia system overseers are all on board with getting rid of as many pike as possible.

“We need to stop pike from moving downstream now,” Colville Tribes principal biologist Holly McLellan told Harrison, who also quoted Guy Norman, a former WDFW regional director and now member of the power council, as saying, “This is something that could have significant ecological effects on the lake, and on fisheries both in the lake and downriver. We need to get on top of it.”

Not only will putting a halt to northern’s southerly advance down the Columbia system help prevent damage to FDR’s stellar trout, kokanee, walleye and bass fisheries and ESA-listed salmon and steelhead populations below Rufus (the tribes also want to reintroduce stocks above Grand Coulee) but also provide fewer pike for jackasses to illegally move around, like the one that turned up in Lake Washington earlier this winter.

Baker says that gillnetting and monitoring will continue through spring.

And Harrison reports that crews will target the shallows this fall to remove and assess juvenile populations, while eDNA testing stations downstream will tell tribal and state monitors if pike are closing in on Grand Coulee Dam or getting into the Columbia Basin Reclamation Project.