Why did the fish population in Yellowstone disappear?

By The Associated Press SAN FRANCISCO — A team of researchers from the U.S. Geological Survey (USGS) and other researchers have used satellite imagery and data to identify the most abundant fish in Yellowstone National Park.

The team of scientists discovered that the average annual size of Yellowstone’s fish population has declined from nearly 9,000 to more than 3,000 fish.

The scientists say the fish have declined from about the size of a duck to a small fish, and that they are declining because of climate change, habitat loss and other factors.

The scientists identified the most important species in Yellowstone in a new study published in the journal PLOS ONE.

They said the population was declining in part because of overfishing, pollution and climate change.

The researchers say they have identified a handful of other large fish species in the park.

They have identified the species in five years.

The study is the first to identify fish populations in the wild in the area that was once the home of the great Yellowstone ecosystem.

The fish population decreased from 9,500 in 2013 to 3,400 in 2015, according to a report released by the U-S.

Fish and Wildlife Service in February.

The decline has coincided with the expansion of the park and the removal of invasive plants.

In their report, the researchers wrote that their study found that the fish were more common in wetlands than the rest of the Great Lakes.

The researchers found that over half of the species they identified were found in the Mississippi River and the Grand Canyon.