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Hundreds of dead eels and trout wash up in river in Dunedin, New Zealand

Low oxygen and high temperatures appear to have caused the deaths of hundreds of eels and trout in Dunedin’s Silverstream.

Mosgiel angler Bevan Campbell, who alerted Fish & Game Otago and the Otago Regional Council, said he had never seen anything like it.

Both agencies were on site last night.

Trout used the lower Silverstream as a refuge when the Taieri River was in flood and dirty, Campbell said.

Otago Fish & Game chief executive Ian Hadland said the likely cause of death was warm, low-oxygen inflows of ponded floodwater from surrounding farmland.

‘We have taken oxygen levels in the lower Silverstream today and they are still very low – borderline lethal for fish – and it’s down to near zero in one of the drains leading into the stream.

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Thousands of dead fish wash up along a lagoon in Patagonia, Argentina

The pejerreyes and the trout appeared mysteriously on the sand and ignited the alert since a decade ago something similar had happened in that mirror of water.
It is about Carrilaufquen lagoon, located about 15 kilometers north of Jacobacci by Provincial Route 6. For several years the lagoon had disappeared due to the great drought, and in 2014 it regained its natural state.
At the beginning of 2015 the province planted 5,000 rainbow trout fry, following a request from the neighbors and ordered by resolution to close the fishing until December 15, 2017.
“We are worried about what is going on. While the studies are going to determine what happened, we suspect it may be overpopulation,” said local Public Services Secretary Carlos Quisle.
Faced with this situation, two aquaculturists from the Andean Zone Sport Fishing Board visited the lagoon to take water samples and collect fish to send to the National University of Comahue.
The technicians admitted that “it may have been caused by lightning, by the proliferation of algae or by overpopulation of fish.”
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Thousands of fish found dead ‘a mystery’ in a stream in Denbighshire, Wales, UK

Fish Kill Alert

Thousands of fish have been killed in a stream sparking an investigation by Natural Resources Wales.
Up to 3,000 fish are thought to have been killed on a mile-long stretch of the Nant Mawr between Ruthin and Denbigh .
They include salmon, sea trout, brown trout, eels and bullheads.
The incident is believed to have been caused by a blockage in the river. This has now been removed and river levels are expected to return to normal shortly.
Exotic tuna caught off Llyn Peninsula ‘shows seas are getting warmer’
However, the Nant Mawr is an important spawning stream for fish and the incident is likely to have a serious effect on fish populations in the area.
Nant Mawr is a tributary of the Clywedog which feeds the River Clwyd.
Health warning in Wrexham after toxic algae found in lake
NRW officers warn that as the river flows return to normal, the carcasses are likely to be washed downstream.
The fish may have been dead for a few days and people are asked not to touch the carcasses and allow them to be washed away naturally.
Emyr Jones, leading the investigation for Natural Resources Wales, said: “Fish such as trout and salmon are an important part of the ecology of our rivers and our economy.
“We are now investigating the cause of the blockage and will look at taking enforcement action against anyone who may be responsible.”
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5,400 rainbow trout dead ‘due to heat’ in a hatchery in Washington, USA

Fish Kill Alert

Water that was too warm killed about 5,400 rainbow trout — nearly all of them — at the Whatcom Falls Park hatchery during a summer marked by drought and high temperatures.
Most of the fish were in two large shallow ponds at the hatchery, which belongs to the Washington state Department of Fish & Wildlife but is operated by Bellingham Technical College’s fisheries program.
“This weather we’ve had, we’re seeing warmer water temperatures than we’ve ever seen historically,” said Kevin B. Clark, Nooksack Basin hatchery manager for Fish & Wildlife. “It basically cooked them.”
Clark said the massive fish die-off occurred first in one pond, around mid-July, and then in a second pond the third week of July — both seemingly overnight.
“This is an absolute first for us. I hope it’s not a pattern,” he said, noting the dead fish were “warm to the touch.”
This was the second hottest July on record in Bellingham. The average high was 76.8 degrees, according to the National Weather Service. The normal high is 71.3 degrees.
The average low was 57.7 degrees, well above the norm of 53.5.
Water temperatures at the hatchery were, on average, four to five degrees warmer than usual for that time of the year, with a high of 76.2 degrees that was recorded shortly after a hot Fourth of July weekend, according to Clark.
“That’s so warm you just look at them and they just about die. The fish just don’t like water that warm,” said Earl Steele, fisheries instructor at Bellingham Technical College.
BTC’s fisheries program and its students operate the hatchery for the state.
Clark said most of the fish that died were going to be among those put into lakes in Whatcom, Skagit and Island counties for fishing. A couple hundred managed to survive.
“I hope they can make it until things cool off,” Clark said.
Of those that died, he said, “That’s over a year’s worth of work for us.”
The water for the hatchery ponds at Whatcom Falls Park is pulled from the shallowest part of Lake Whatcom, near Bloedel Donovan Park, and then a gravity-feed system empties water into the ponds.
The water is cooler when it first drops into the concrete ponds.
When temperatures started to climb, the hatchery tried to cool the ponds by exchanging the water faster and putting a tarp over one of the ponds. Neither could offset the warmer temperatures.
Clark said people asked him why crews didn’t truck the fish to places with cooler temperatures. He said with the amount of stress the fish experienced because of the warm water, they likely would’ve die as he tried to transport them.
And Bellingham water couldn’t be used to cool the ponds because it contains chlorine, which is deadly to fish.
“We get a lot of visitors to Whatcom Falls Park,” he said, “and there was a lot of questions.”
This might have been the last year for visitors to see fish at the hatchery during summer.
Warmer temperatures in recent years already required crews to treat the trout for columnaris and “ich,” bacteria and parasites that sicken fish. That’s made it more difficult to have fish at the hatchery during summer the past three years.
In the short term, the state will continue to use the hatchery at Whatcom Falls Park, but only until the second week of April when the fish will be put into area lakes for the opening of trout fishing season.
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600+ trout found dead in a river in Aveze, France

Gard : plus de six cents truites sont mortes dans l'Arre
A small group of volunteers traveled the streams on 400 m to pick up the dead in the town of Avèze fish. This approach was organized in a health concern but also to preserve the image of the territory on the eve of the arrival of tourists.
Patrick Courant, president of the fishing company, the balance sheet is heavy. “More than six hundred trout, hundreds of other fish and crayfish of all sizes are dead. Some trout measured more than 30 cm. And not to mention the destruction of countless fry of the year. The anger of fishermen is legitimate. They seek compensation.” This pollution is of accidental origin. The product in question comes from a sawmill of Molières-Cavaillac.
The Arre was considered once including the most nourishing of the grace Department River to its limestone environment. In recent years, she became ensure fishermen. The population of trout in the Cévennes rivers is Mediterranean strain pure, perfectly adapted to its environment. One of the objectives of the society of the Arre fishing is to “improve his genetic knowledge of the local aquatic environment very rich and varied to adapt its practices”.
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Hundreds of dead Trout found ‘is a mystery’ in a river in Schelpe, Germany

Fish Kill Alert

A mysterious death of fish in the Schelpe employs the inhabitants of Brenkhausen. There are several hundred trout have been found.

Citizens in Brenkhausen have found a number of dead fish for trout in a stream of Schelpe on Wednesday afternoon and informed the water authority of the district Hoexter. By the department of water samples and dead fish were seized for examination. Legged subsequent Bach commission gathered members of the fishing club Brenkhausen a three ten-gallon bucket full of dead fish. The first dead trout were about 100 meters above the tennis registered home, the last in the amount of the old sewage treatment plant. In the Schelpe are mainly due to the low water level undersized fish that migrate to a greater state into the Weser. So about 300 trout were collected in size from ten to 15 centimeters and about 15 large specimens dead from the stream. “I’m assuming that the entire fish population has died in the area of ​​the village Brenkhausen,” said Chairman of the Fisheries Association Brenkhausen, Johannes Hahn angle. In addition to the financial loss for the club and the environmental damage was great. For it was also killed the large stock of Mühlkoppen. Mühlkoppen, also known as sculpins are ten to 15 centimeters big fish, which are among the most endangered species and are therefore particularly protected. The fishing club Brenkhausen filed a complaint with the police.