The field team electrofishing in the Cullasaja River during the summer biomonitoring survey.

Field Notes · Highlands Biological Station

Shocking News from the Cullasaja River

This summer, high school students once again took part in a long-term aquatic biomonitoring project, wading into a mountain river to count its fish — stunned, identified, and released, one at a time. On the Cullasaja, that count has become a reading of the stream’s health, kept every year since 1991.

By Jason Love · Associate Director, Highlands Biological Station

Cullasaja River · Franklin, North Carolina

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This summer, the Highlands Biological Station is once again hosting high school students from the North Carolina School of Science and Math (NCSSM). Students spend 5 weeks working alongside HBS researchers, research assistants and undergraduate interns, assisting with various research projects, from bird banding to inventorying dragonflies in wetlands.

Members of the field team wading in the Cullasaja River with electrofishing equipment.
Sampling the Cullasaja River near Peaceful Cove Road — a reach that has been surveyed every summer since 1991.

In the water

But one of the highlights each summer is joining Dr. Bill McLarney from Mainspring Conservation Trust to assist in their long-term aquatic biomonitoring project, where students help to inventory fish using an electrofisher. The electrofisher momentarily stuns the fish so they can be captured, identified, and counted before being released back in the stream.

The number and type of fish inventoried can tell us a lot about the condition of a stream.

On the Cullasaja, since 1991

This year, we once again helped sample the Cullasaja River near Peaceful Cove Rd. This site has been sampled annually since 1991. This year, we caught 19 species of fish, including the rare Wounded Darter and colorful Gilt Darter, as well as a Brown Trout and several Rock Bass.

The 2026 survey

19
species of fish recorded this year
1991
sampled every summer since
FAIR
this year’s stream-health score a slight drop from last year’s GOOD

The verdict

Based on the number and types of species we captured, the site scored FAIR, a slight drop from last year’s score of GOOD. However, overall trends show that the site is holding steady and perhaps even slightly improving over time, which is good news for both people and fish.

Streamside fish sampling on the Cullasaja River during the summer biomonitoring survey.
Each fish is stunned for only a moment — long enough to be identified and counted before it is released back into the stream.

Keep reading

More notes from the field.

Dispatches from the streams, forests, and gardens of the southern Blue Ridge — the research, teaching, and long-term monitoring that happen at Highlands Biological Station all season long.

Read more field notes

The Upper Little Tennessee Aquatic Biomonitoring Program, which includes the Cullasaja River, is led by Dr. Bill McLarney of Mainspring Conservation Trust.