Warm water temperatures may be causing stress and increase the risk of infections and other illness in fish.

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."

As of July 21, fishermen in Bristol Bay’s five districts had harvested just more than 42 million salmon.

Wildlife officials used rotenone, a fish-killing chemical, to eradicate goldfish illegally introduced to the pond at Cuddy Family Midtown Park.

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.

Thousands of dead sockeye salmon (Oncorhynchus nerka) found dead along the beach during a period of warm weather. Additional salmon have been observed in the Togiak River, raising concerns about possible challenges to subsistence harvest.

Chum salmon (Oncorhynchus keta) caught with a spinal curvature, which may be related to many different factors including genetics, infectious disease, trauma, neoplasm, diet, or changes in the environment.

Two sturgeon were caught in the Yukon River, farther upriver than has been previously reported.

Alaska Sea Grant agent Gay Sheffield from Nome responded to report of a dead bowhead and a dead grey whale northeast of Shishmaref near Cape Espenburg.

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.

In early July, dead fish were observed floating along Kouwegoki Slough and along Powers Creek, among other locations.

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.

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.