Images

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.

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.

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.

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.

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.

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. 

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

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

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.

White turtlehead. Chelone glabra. A good bumble bee plant and host for the Maryland State Butterfly, the Baltimore Checkerspot. Photo and specimen by Helen Lowe Metzman. Howard County, Maryland.

White turtlehead. Chelone glabra. A good bumble bee plant and host for the Maryland State Butterfly, the Baltimore Checkerspot. Photo and specimen by Helen Lowe Metzman. Howard County, Maryland.

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The very small and skinny, beetle hole nesting, Chelostoma philadelphi. A specialist on Philadelphus (mock orange). This species is most commonly seen on the non native European Mock Orange that was widely planted in the olden days.

The very small and skinny, beetle hole nesting, Chelostoma philadelphi. A specialist on Philadelphus (mock orange). This species is most commonly seen on the non native European Mock Orange that was widely planted in the olden days.

The very small and skinny, beetle hole nesting, Chelostoma philadelphi. A specialist on Philadelphus (mock orange). This species is most commonly seen on the non native European Mock Orange that was widely planted in the olden days.

Chelostoma philadelphi, Towson, Maryland, Baltimore County

Chelostoma philadelphi, Towson, Maryland

A series of pictures of a male and female species that loves Bellflowers (Campanula). Meaning that the female of this species provisions its nest (note: males never help in all Hymenoptera) with the pollen of this plant.

A series of pictures of a male and female species that loves Bellflowers (Campanula). Meaning that the female of this species provisions its nest (note: males never help in all Hymenoptera) with the pollen of this plant.