During the summer of 2019, warm water temperatures lowered the amount of dissolved oxygen in rivers and caused salmon across the state, including Mountain Village, to die before they were able to spawn.

Dead chum salmon are lining the banks of one of the Yukon River’s largest tributaries. Koyukuk River residents and scientists alike suspect the deaths are

"Over 40 dead dog salmon, one shee fish, one lush fish, and two delmaga all dead along the river going towards the creek opening."

Salmon are dying along the Andreafsky River and Lower Yukon River before spawning out. Water surface temperatures have been unusually warm, at one point reaching 70 degrees Fahrenheit.

Krill (Thysanoessa spinifera) were found washed up along the beach in Dutch Harbor. Samples sent to University of Alaska Fairbanks are in the process of being tested for toxins.

The timing coincides with other sea bird deaths reported in St. Paul Island, Pilot Point, and Ugashik.

An unidentified substance was found washed up on the Summers Bay beach. Samples were sent to University of Alaska Fairbanks (UAF) and are being tested.

Fifty pilot whales were found dead on the shore of Löngufjörur in a sparsely populated part of the Snæfellsnes peninsula on Thursday, RÚV reports.

As record high temperatures swept Alaska, many people said that the heat was killing them. For Kuskokwim salmon, it was actually true.

Dead chum salmon have been spotted floating down the Yukon river. Water temperatures are measuring at 70 degrees, the warmest in recollection.

We observed more than 50 otherwise healthy (not spawned out) dead fish including pink and chum salmon and white fish

Warm water near Golovin is hurting pink salmon. Many salmon caught had red speckled dots on flesh, raising concerns about food safety. Female pink salmon were seen dead in the bay.

Norton Sound residents have reported salmon die-offs in unusually large numbers during the last week. According to the Norton Sound Economic Development Corporation (NSEDC), dead pre-spawned pink salmon were found in multiple river systems over the weekend.

Dead salmon and whitefish found along the banks of the Yukon River.

A burying beetle was seen for the first time by an observer in Tuntutuliak.

It was also during the week where a number of dead fish started to occur along the riverine segment.

Hundreds of dead sand lance (Ammodytes hexapterus) found along the shores of White Sands Beach.

"Our temperatures reached 83 degrees, and seem to be getting hotter! We think that maybe the warm water has something to do with the humpy die-off?"

Village wildlife observers worry that the unusual warmth of oceans off Alaska is causing problems throughout the ecosystem.

Massive amounts of the mussels clinging to the rocky shores and cliffs of the Bodega Marine Reserve were cooked in the June heat wave.