Images

As part of a fish health assessment, Heather Walsh is performing a necropsy on a young of the year smallmouth bass from the Susquehanna River.  Previously, young of the year smallmouth bass from the Susquehanna River drainage experienced fish kills and lesions.  This work was conducted to follow-up on the health status of these bass populations.

This is Drew Kellogg, a 2019 USGS summer hire filtering water in Rock Creek Park for eDNA analyses. The eDNA will be screened for the presence of aquatic invertebrates. 

Brendan Crossman measures porewater salinity in a vegetation plot situated on a survey transect from the wetland into the adjacent upland forest.

Numerical values and colors represent the total frequency of observer passes through the center of each grid cell during the 60 d of survey activity (1–4 surveyors each survey day) by USGS EESC in 2020. For example, a value of 40 would mean that a given grid cell was searched 40 times during the season.

Dr.s Densmore and Henderson conducting a health assessment on a northern snakehead fish. This fish species is an air breather so health assessments out of water are not impossible to perform. 

Left: Prototype ABS plastic eel climbing ramp under development and testing at CAFRL. New substrate design allows for passage of a wider size range of eels with less need for precise flow regulation. Right: juvenile eel climbing wetted ABS plastic substrate.

A silver-phase American Eel in a northeastern river begins migrating downstream to the ocean to spawn in the Sargasso Sea. The migration can span hundreds of kilometers in freshwater rivers and thousands of kilometers at sea.

Radio-tagged silver phase American Eels being released for a CAFRL telemetry study of downstream passage of eels at hydroelectric dams on the Shetucket River, Connecticut.

Prototype design of an airlift developed at CAFL to transport downstream migrant eels through a bypass pipe and away from turbine intakes. The airlift design passes eels as well as a conventional siphon or gravity pipe.

This is the banding station used by BBL for years before the recent upgrades. 

Dr. Christine Densmore, DVM uses an ultrasound on fish as part of a health assessment.

Apparatus used to test the sensitivity of eels to low-voltage pulsed DC electric fields. Knowledge of sensitivity of eels to electric fields enables development of behavioral barriers that use electricity to guide eels away from turbine intakes.

Take in the S.O.Conte Fish Research Lab O'Day Wet Lab. Baby Sturgeon hatched & brought in from Canada

Karli Rogers using a FlowTracker2 in a headwater stream in Shenandoah National Park. This instrument is used to calculate stream discharge at a given moment in time, then associated with other discharge measurements to predict long-term discharge data through time and space.

Beetles from Kruger National Park in South Africa. This is the start of a series of pictures of insects that come to the flowers in Kruger. This is a project led by James Harrison from S.A. and Jonathan Mawdsley from the U.S. I was lucky enough to come along and do some bee collecting. Interesting system.

Black Cohosh, Actaea racemosa. An interesting flower of midsummer in forest openings. Seems to attract the odd bumble bee and Augochlora pura that linger in the shade. Collected and photographed by Helen Lowe Metzman.

Nectaring on goldenrod and aster, Beltsville, Maryland. Thanks to Chris Thompson for the identification.

Pennington County, South Dakota, Badlands National Park

Check this bee out! Anyone with an eye can tell how it got is name, This male was captured in the Great Basin National Park, Nevada as part of a survey of bees in high elevations vulnerable to climate change.

Yet another Agapostemon, this one was collected in the southern remote portions of Badlands National Park in South Dakota within the Pineridge Indian ReservationCanon Mark II 5D, Zerene Stacker, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash, F5.0, ISO 100, Shutter Speed 200, link to a .pdf of our set up is located in our profile

Gliding in from Costa Rica comes a moderalely large, moderately green bee. An Agapostemon nasutus. There are a lot of the these bright green bees out there...Not just in C.R. but throughout the Americas. Beautiful, and once you start paying attention, quite common. But are there any songs written about them? No. Poems? Zero. Green Bee Secret Societies?