Kokanee die off in Okanagan lake

Clint r

Well-Known Member
Copied from castanets news service:

Hundreds of dead fish
http://www.castanet.net//content/2016/7/screen_shot_2016-07-17_at_1.36.09_pm_p3143012.jpg
Photo: Contributed
Darren Handschuh - Jul 17 7:18 pm
UPDATE 7:17 P.M.

The fish die off in Okanagan Lake does not appear to be isolated to the area around Peachland.

Castanet has been told more than 50 dead Kokanee were also spotted in the Okanagan Centre area earlier today.

All of the dead fish are approximately the same size as the ones found earlier.

Another reader, Jaiyney, told Castanet a similar die off happened in 1990 when a creek that emptied into the lake was polluted with toxic chemicals.

UPDATE 5:13 P.M.

It would seem the fish die off has been going on for a few days.

Dave sent a tip in to Castanet that he noticed the dead fish on Friday.

"I reported the dead Kokanee on Okanagan lake to the ministry on Friday. It's only been Kokanee and no other species that I've seen. My kids were collecting them as they floated past. They are still floating past the beach today in Peachland, but not as many," Dave said in an email that included pictures of several dead fish.

Hundreds of dead fish have been spotted floating in Okanagan Lake.

Alexandria Holtz left the boat launch in Peachland at around 11 a.m. Sunday, July 17 and as she and her husband made their way across the lake to Half Way Point, they discovered hundreds of dead fish.

"They were every couple of feet. They were everywhere," she said, adding when they first saw the fish they were around 300 metres from shore, but by 2 p.m. they were within 25 metres of the shoreline.

"You can see them from shore now. There are kids on floaties picking up the dead fish. They go all the way across to Okanagan Mountain," said Holtz.

"They are all about the same size. There is no visible clue on why they died. There is no physical damage to them."

Holtz believes the dead fish are kokanee,which have been struggling to make a comeback in Okanagan Lake for years.

"They were all the same size, round eight to 10 inches," she said, adding she did not see a sheen from possible oil or gasoline in the water.

"I have no idea what killed them," she said.

Ministry of Environment officials could not be reached for comment.

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Copied from castanets news service:

Biologists admit they are stumped so far over the ongoing die-off of Okanagan Lake kokanee, but they believe recent wind storms or a viral outbreak could be to blame.

More than 1,000 of the landlocked salmon have washed up on the shores of the lake since July 14, mainly around Peachland and Okanagan Centre.

A release from the Ministry of Natural Resource Operations states that the die-off is not severe enough to have a significant impact on the lake's overall kokanee population.

While the cause has not yet been found, previous die-offs in Okanagan Lake and elsewhere are said to have been associated with strong winds that can send warm surface water deeper into the lake. Such sudden changes in water temperature can be deadly to kokanee, according to the release.

Die-offs in other lakes have also been linked to a virus called infectious hematopoietic necrosis.

Staff at the Freshwater Fisheries Society of B.C.'s fish health lab in Duncan are analyzing kokanee tissue samples to find out if disease was a factor in the recent deaths.

Last year, biologists counted more than 336,500 spawning kokanee on the lake, the most since annual counts began in 1992.

Over the weekend, people reported seeing hundreds of the dead fish floating in the lake, with children on floaties picking them up.

 
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