Saturday , June 19 2021

Polycarbonate invasive north is 10 miles from the Grand Coulee Dam, the Spokane tribe catches 45 inches of fish



In a huge, cold warehouse in the Airy Heights warehouse, a group of Spokane tribes of Indian fish biologists surrounded a large, mean-looking fish.

On a folding plastic table lay 45-inch, 27.5 pounds. Spokane tribesmen's biologists caught the fish in the Spokane arm of Lake Roosevelt during a weekly gilient campaign aimed at invasive sex.

The spear is the largest fish managers on the lake caught.

But what really worries the fish is not its size. Instead, it is another sign that the Northern Spear are making their way up the Columbia River system.

During the same gillnetting effort that week, the Colville clan, one of the three managers of Lake Roosevelt, caught the lupus only 10 miles from the Grand Coke Dam.

"They eat everything," said Knudson while her colleague Wardin Matterly cut into the fish on Tuesday. "They'll eat ducks, birds, fish."

Alix Silver added: "I saw a wolf in a spear with a spear."

Fish have razor-sharp teeth and ambush their prey. Unlike Walleye – another nonnative carnivorous fish – the northern spear eating large fish, such as adult salmon.

This is one of the concerns about the spread of species. Until this year, the northern spearhead was only identified downstream as hunters, Washington. With the capture of a pike 10 miles from the Grand Coulee, this means the fish are approaching the rock salmon habitat.

"They certainly have the potential to affect fishing," said Chuck Lee, a fish biologist at the Washington Department of Fish and Wildlife. "The real thing is if they go down around Okanogan where we have sockeye returns." These fish are able to eat adult sockeyes. "

Last week WDFW, the Spokane clan and the Colville clan combined for a gillnetting effort to join around Lake Roosevelt. The aim of the analysis was to develop an accurate survey of the northern craft and to determine the effectiveness of the repression efforts, Li said.

Although the data is still coming back, told me to grab information from 150 networks deployed does not look good. Biologists took the spear in 70% of the nets that hit the lake.

"They're undressing," he told me. "They're almost everywhere."

That does not mean there is no way to stop them.

Starting in 2012, the Calispell tribe, which worked with WDFW, successfully suppressed the northern spear in the Pand Oril River.

Nick Bian, a biologist with the Calispell tribe, said that most of the work of suppressing Peake now is maintenance.

But Lake Roosevelt presents various challenges. The pure size of the lake is an obstacle, and finding funding for the project has been a struggle for WDFW cash.

"WDFW is running red," he told me. "We have to put about 10 times or more effort than we currently put."

WDFW spends between $ 60,000-80,000 a year on pike suppression. In May, Chris Denley, WDFW's fish area manager, estimated that to be effective, WDFW would have to spend about $ 400,000.

Most of the funding comes from the Spokane clan and the Colville clan as well as money provided by Bonneville Power Manager and the Chelan Public Utilities District.

"They do what they can with what they have," said Brent Nichols, the tribe of the tribe of Native American fisherman.

As for stopping, or at least significantly slowing the spread of Pike, Nicholas said more should be done.

"It will take a lot more effort than we are funded to do," he said.

Pike oppression is a priority for the Colville and Spokane tribes.

The Spokane tribe spent about $ 400,000 in 2018 on the suppression of Pike Roosevelt. In 2019, Pike's base budget will fall to $ 285,000 with the expiry of one-time funding from BPA, Nicholas said.

The Colville and Spokane tribes are taking the lead on repression efforts while WDFW led the survey last week. As of October, the tribes had removed 2,021 Pike in that year. The Colville Reward Plan had taken Pike 509 out of the system.

Since 2015, Pike's 8,051 have been removed from the lake, Nichols said.

"I think the biggest problem with Roosevelt is that it's huge," said Bill Baker, WDFW's regional biologist. "I think we're making progress in understanding how to deal with the source population, but it's a hard nut to crack."

In the 1970s, the fish were found at Lake Quar d'Alain and the Upper Spokane River. In 2004 they made their way to the Orly Pend River.

The invasion of the North Coast resulted from the illegal introduction to Montana. The spear found its way down the Flathead River into Clark Fork. In the early 2000s, they found an ideal habitat in the box of the Orly Pand Box boxes.

Although the repression efforts of the Clispell Clan were mostly successful, some pike continued downhill into British Columbia where Pand Oril flows into Colombia.

In May, when the speaker wrote the latest review on northern fireworks, some fishermen investigated the severity with which the spear encountered other species. One of the reservoirs references a legend in South Dakota where the northern spearhead coexists with other species.

Biologists from the WDFW and the Spokane Clan do not believe possible co-existence in the Columbia River system. Pike grows too fast and eat too much. Because they are non-native species, Washington fish have not developed effective survival strategies.

What's more, the topography of the system makes a big difference, Nicholas said. Pike spawn and spend much of their time in shallow water. In a shallow water system, the marshes are separated from the deeper waters, it is possible for the pike to coexist with other fish.

That was not the case at Lake Roosevelt, Nicholas said. The loose water from the dams created a "habitat" for the spear, he said.

North Pike Alaska has devastated some salmon fishing. At the Lake Roosevelt Forum, in April, Alaska biologists warned field managers of the danger posed by the spear, especially to salmon.

"They can not exist in this habitat," Nicholas said.


Source link