On the Redd: Protecting Trout During Spawning Season

7 min read

Conserving the Croton | Fall 2026 Edition | Croton Watershed Chapter of Trout Unlimited

As autumn settles across New York, brown trout and brook trout are entering one of the most important periods of their life cycle: spawning season. For anglers, this is an opportunity to see wild trout in a different light and to play a direct role in protecting the next generation of fish in our local streams.

In this first installment of our conservation feature series, we explore New York’s evolving trout fishing regulations, learn how to identify trout spawning beds, or redds, examine ways to reduce our impact while wading, and highlight how Trout Unlimited’s Spawning Redd Survey Tool helps document spawning activity.

A brief history: What changed after October 15?

For many years, October 15 marked the end of the traditional trout fishing season on many New York inland trout streams. The date served as a seasonal dividing line, closing the regular harvest season just as many brown and brook trout were beginning to spawn.

That changed in 2021. Following its statewide Trout Stream Management Plan, the New York State Department of Environmental Conservation (NYSDEC) introduced a statewide catch-and-release season for inland trout streams running from October 16 through March 31. During this period, anglers must release all trout and may fish only with artificial lures, subject to applicable water-specific regulations and exceptions.

The updated framework also simplified many existing regulations and established management categories with different harvest limits during the regular season. These changes expanded fishing opportunities while maintaining a framework for managing and protecting New York’s trout fisheries.

But regulations alone cannot protect spawning habitat. As more anglers spend time on the water during autumn and winter, understanding where trout spawn—and how to avoid disturbing those areas—becomes increasingly important.

Review New York's inland trout stream regulations for the applicable stream category and reach.

Always check the current NYSDEC regulations for your specific stream or river reach before fishing.

Know what to look for: Identifying a trout redd

A redd is a spawning nest that a female trout creates in the streambed gravel. Using her tail, she clears and moves gravel to form a depression where eggs are deposited and fertilized. She then covers the eggs with gravel, where they develop until hatching.

Brown and brook trout typically spawn in the fall, although timing varies with water temperature, stream conditions, and location. Their redds are often found in shallow areas with clean, loose gravel and a steady flow of well-oxygenated water.

How can you recognize a redd?

Suitable spawning habitat: Redds are commonly found in gravelly riffles and the transitions between pools and riffles, where water flows over suitable substrate.
A lighter-colored patch of gravel: The stones may appear brighter or cleaner than the surrounding streambed because the trout has disturbed the substrate.
A distinct depression: The upstream portion of the redd often contains a shallow hollow where the female excavated the nest.
A downstream mound or tail: Gravel displaced during excavation may form a small mound immediately downstream of the depression.

Redds vary in size and appearance, and natural stream currents can create similar-looking features. Look for the combination of a depression, lighter gravel, and a downstream mound rather than relying on a single characteristic.

Redd with brown trout: The lighter, freshly disturbed gravel surrounding the fish marks the spawning area. Observe from a distance and avoid wading through or stepping on it.

When scanning a stream, look for a combination of lighter gravel, a shallow depression, and a small downstream mound of displaced stones. Light gravel alone is not definitive—currents and other natural processes can create similar patches—so treat suspected redds as sensitive habitat and give them a wide berth.

Redds can appear as pale patches of gravel within a darker streambed. In this view, the lighter gravel patch in the foreground is the feature to notice; use the surrounding streambed and the shape of the disturbed gravel to help assess whether it is a redd.

When in doubt, do not cross the area. Protecting a redd starts with recognizing the possibility that eggs may be buried beneath the gravel, even when no fish are visible.

Wading responsibly: Give spawning habitat space

Finding a redd is exciting, but it comes with a responsibility to leave the area as undisturbed as possible. Trout eggs develop within the spaces between gravel particles, relying on clean, oxygenated water. Excessive disturbance can dislodge eggs, damage developing embryos, or shift sediment into the gravel and reduce water flow.

Even anglers who practice catch-and-release can unintentionally harm spawning habitat by walking through it.

For more on protecting spawning habitat, see Trout Unlimited's guidance on identifying and avoiding redds.

Watch before you wade. Take a few moments to scan the streambed from the bank or another stable vantage point before entering the water. Polarized sunglasses can help reveal changes in gravel color and structure.
Avoid crossing redds. If you spot a suspected redd, do not step on it or wade directly through the surrounding spawning area. Give it a wide berth and choose another route. Remember that eggs may be buried beneath gravel even when no fish are visible.
Choose your entry and exit points carefully. Enter and leave the water through areas with stable footing and minimal sensitive habitat. Avoid shallow gravel bars and likely spawning areas whenever possible.
Do not disturb the streambed. Avoid shuffling your feet through gravel, moving rocks, or probing the bottom near a redd. These actions can dislodge eggs and stir up sediment that settles into nearby gravel.
Leave spawning trout alone. Consider giving visibly spawning fish a complete break from angling. Catch-and-release rules do not eliminate the stress of being hooked, handled, or repeatedly targeted during reproduction.
Prioritize safety. Cold water, slippery rocks, changing flows, and shorter daylight hours all increase the risks of fall and winter wading. Use appropriate wading gear, a wading staff, and a wading belt, and avoid entering water that exceeds your comfort or ability.

Turn your observations into conservation data: TU’s Spawning Redd Survey Tool

Recognizing a redd is valuable. Documenting where redds occur can be even more valuable.

Trout Unlimited’s Spawning Redd Survey Tool gives anglers and volunteers a way to record spawning activity using a smartphone. The survey operates through the ArcGIS Survey123 application and helps collect location-based observations of trout spawning habitat.

Rather than relying solely on occasional observations or informal reports, this approach creates a more consistent record of where spawning activity is occurring across a watershed.

How to get started

The following download and form-access steps are adapted from the supplied Redd Survey Handbook excerpt.

Please complete the following steps before the day of the event:

Open your device’s app store. Tap the “App Store” icon on your smartphone or tablet.
Find Survey123. Search for “Survey123” in the app store.
Download the app. You may be prompted to enter your Apple ID or Google password.
Access the survey form. After downloading the app, type https://arcg.is/0u5vm into your device’s web browser, such as Safari or Google Chrome—not the Google Search app.
Open the form in Survey123. On the webpage, select “Open in the Survey123 field app”. The form should open in the app. If prompted to allow Survey123 to access your location while using the app, select yes.
Return to the form. After first accessing the form, open the Survey123 app and find it on the “My Surveys” page.

Please complete these steps before arriving at the event to help ensure a smooth start to the survey.

How does the tool work?

Once the survey is loaded, volunteers use it in the field to document observed redds. The survey is designed to capture information about spawning locations and observations, including geographic coordinates, so the records can be mapped and reviewed.

The exact fields and procedures depend on the survey configuration, so volunteers should follow the instructions provided in the app and by their chapter or survey coordinator. Take care to record genuine observations and avoid disturbing the habitat while collecting data.

If you complete a survey without cell service or Wi‑Fi, it will be saved to the Survey123 Outbox, and once you regain connectivity, simply open the survey from the Outbox and tap the checkmark and Send Now to submit your data. Before heading out, download and test the survey, and follow your chapter's instructions for submitting your observations.

Why does this matter for our local streams?

Every accurately documented redd helps build a clearer picture of trout reproduction in our watershed.

Identify important spawning areas that may warrant additional protection.
Inform habitat restoration priorities by identifying where spawning activity occurs and where suitable habitat may need improvement.
Track changes over time as surveys are repeated, helping reveal shifts in spawning distribution or timing.
Support science-informed conservation decisions by providing fisheries managers and local conservation organizations with additional field observations.
Engage anglers in community science by turning time spent on the water into meaningful contributions to trout conservation.

Redd counts are not a complete measure of trout population health, and a single survey cannot tell us how many eggs will survive or how many young trout will emerge. Survey results are most useful when collected consistently and interpreted alongside other fisheries and habitat information.

Still, a growing record of spawning activity can help us better understand our rivers and make more informed decisions about protecting them.

Volunteer trout spawning survey opportunity

On November 14^th, the chapter will be organizing a volunteer trout spawning survey along the Amawalk Outlet. Participants will split into teams and survey assigned stream sections to help document spawning activity and support local conservation efforts. If you would like to participate please sign up here.

The takeaway: Protect the next generation

New York’s fall fishing season offers an opportunity to enjoy our streams while recognizing that these waters are also nurseries for the next generation of wild trout.

This season, challenge yourself to look more closely at the streambed, recognize potential redds, choose your wading routes carefully, and leave spawning fish undisturbed. If you encounter a redd and can document it responsibly, consider contributing that observation through Trout Unlimited’s Spawning Redd Survey Tool.

Conservation does not always require a major restoration project. Sometimes, it begins with a single angler recognizing an important patch of gravel, choosing not to step on it, and helping others understand why it matters.

Have questions about Redd identification or need assistance using the survey tool? Contact Croton Watershed Conservation Chair, Justin Smith at justinasmith786@gmail.com.