The largest pike yet was caught this month on Lake Roosevelt, a 28.2-pound egg-laden female, and it was a lot further down the 150-mile-long reservoir than nearly all other northerns captured so far.
The 43.3-inch nonnative invasive fish was netted in the Sanpoil River arm, the mouth of which is just 17 miles from Grand Coulee Dam.
Even as state and tribal fishery managers are working more and more intensively to keep pike from getting below that dam and Chief Joseph into the salmon and steelhead zone, that a huge one turned up in the arm worries the Colville Tribes too.
“The Sanpoil River hosts the largest wild redband trout run in Lake Roosevelt. We are very concerned about northern pike increasing in abundance in the part of the reservoir,” said Holly McClellan, the tribes’ principal fisheries biologist.
Last year a 6.2-pound pike was caught just 10 miles from the dam, but the fish have mostly been found in the impoundment’s upper arm, up around the mouths of the Kettle and Colville Rivers, though they have been moving downlake towards Hunters and beyond.
The previous largest northerns were a 27.7-pounder caught at Signers Bay, at Kettle Falls, and a 27.5 in the Spokane Arm.
The implication of a 28.2-pounder showing up so relatively far downlake takes awhile to sink in.
A fish that large will have been capable of breeding for quite some time, and the Northwest Power and Conservation Council, which first reported the catch, said the big female had gonads, where the eggs are stored, that weighed 4 pounds.
Various sources suggest that a near-30-pound pike could carry up to 300,000 eggs.
That the fish was found so relatively close to the dam underlines grim warnings in a recent presentation from a larger report on predator issues in Roosevelt and the Columbia that the council was given. On northerns it stated:
It is likely that pike will eventually invade the anadromous zone — even with the best efforts in public education, early detection, and control or eradication.
Suppression in Lake Roosevelt could reduce risks of downstream establishment by reducing the number and average body size of downstream dispersers.
Even though the invasion is almost assured to occur in time, there is value in delaying it.
It advises managers that early detection and rapid responses are essential for nipping new outbreaks, that they must come up with those plans now before those occur, and they should monitor areas where it’s likely illegal introductions by bucket biologists would occur.
And it suggests it’s likely that young Chinook would be the most vulnerable to pike, followed by chum salmon.
Subsequent to our posting this story, the Colvilles’ McClellan told the Spokesman Review that at the current pace down the upper Columbia, ” … we think they are maybe three years away from being down below Chief Joseph Dam.”