BirdAnalyst
Species · Tennessee · BBS 2026 Release · 1966–2025

Fish Crow Population Trend in Tennessee

All statesGeneralists

Fish Crow in Tennessee has surged: up 20× on the route-weighted index since 1970.

20×Since 1970TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
12Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
48YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Fish Crow Trends in TennesseeNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Fish Crow has surged in Tennessee: up 20× on the route-weighted index since 1970.

Fish Crow Population Forecast in Tennessee

If the recent trend holds, Fish Crow in Tennessee is projected to fall about 80% by 2030 — from 2.1 in 2025 to a central estimate of 0.41 (95% range 0.00–0.99). A 5-year backtest shows a typical error of ±68.7%, with 20% of held-out values landing inside the 95% band.

-80%Change by 2030TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.41Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.9995% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±68.7%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Fish Crow in Tennessee is projected to fall about 80% by 2030 — from 2.1 in 2025 to a central estimate of 0.41 (95% range 0.00–0.99). A 5-year backtest shows a typical error of ±68.7%, with 20% of held-out values landing inside the 95% band.19662030
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20260.380.000.96
20270.390.000.97
20280.400.000.97
20290.410.000.98
20300.410.000.99

Fish Crow Survey Routes in Tennessee

Routes recording Fish Crow in Tennessee.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Humboldt1720252022
Signal Mtn1620252013
Pawpaw 2620252014
Moscow520241976
Pawpaw320111981
Mansfield220252007
Tiptonville120251966
Brownsville120102005
Tibbs120211993
Whiteville119701970
Big Sandy120222021
Fish Springs120232023

Fish Crow Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmississippimissourinew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatexasvermontvirginiawest-virginia

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.