Images

Naturally-deposited herring eggs attached to submerged macrophytes. Coiled embryos are evident inside the eggs.

Herring larvae 15 days post-hatch. Food in the gut appears orange.

Herring larvae 53 day post-hatch. Black pigmentation is evident.

Currently four age classes (0, 1, 2, and 4 year olds) of SPF herring are maintained at the Marrowstone Marine Field Station.

Small herring spawning event in Puget Sound, evidenced by the presence of 'white water', caused by mass release of spawning products into the water.

Palila (Loxioides bailleui). Photo by USGS Pacific Island Ecosystems Research Center.

This photo was taken at Station 4 in 2009 before the Great Works Dam was removed. This location was just upstream of the dam and water levels are significantly lower now that the dam is removed.

A photo taken before the Great Works Dam was removed (likely in 2009), looking upstream from a boat just upstream of the Great Works Dam.

Unused and spent perforating gun used in oil and gas drilling and hydraulic fracturing. The pipe on the bottom left, shows holes created by the explosive charges mounted inside the pipe.

The kerchief over the bear's eyes protects it from dust and debris and reduces visual stimulation. The small tubing in its nose, known as a nasal cannula, delivers oxygen to the animal while it is tranquilized.

Once a bear is radio collared, researchers can track its movements with telemetry.

A photomicrograph depicting the siliceous tests of ten species of marine radiolarians. Upon death, their tests can form siliceous marine sediments known as radiolarian ooze.

A photomicrograph depicting the siliceous tests of ten species of marine radiolarians. This image has been inverted to bring out details. Upon death, their tests can form siliceous marine sediments known as radiolarian ooze.

2006 Rockslide on Ferguson-Hwy 140 in California along the Merced River about 8 miles west of El Portal and the entrance of Yosemite National Park.

Rush River at Amenia, North Dakota, streamflow 1,650 cubic feet per second,  looking upstream.  Photograph taken during spring 2009 flooding.

Aquatic biologist Tom Sabol of the Grand Canyon Monitoring and Research Center takes samples from the Colorado River.

USGS scientist Art Bookstrom uses a hand-lens to search for sulfide minerals in oxidized copper-cobalt-bearing siltite of the banded siltite unit of the Apple Creek Formation, exposed in the Blacktail pit of the Blackbird cobalt-copper mine, Salmon River Mountains, east-central Idaho.

USGS scientist sets up a repeat photograph of Grinnell Glacier in Glacier National Park to illustrate glacial recession due to impacts of climate change.

Front gates at Shumagin Geomagnetic Observatory during installation, before landscaping to eliminate standing water.

This image of a live silver carp egg specimen was taken with a microscope camera at the USGS Columbia Environmental Research Center. Asian carp are invasive species that could pose substantial environmental risks and economic impacts if they become established.

This image of a live silver carp larva was taken with a microscope camera at the USGS Columbia Environmental Research Center. Asian carp are invasive species that could pose substantial environmental risks and economic impacts if they become established.