This Species Status Assessment (SSA) provides a science-based assessment of the species needs, current conditions, and future conditions of Apache Trout (Oncorhynchus apache).  The document was prepared by Trout Unlimited together with a core team of representatives from tribal,...

Each fall, AZFWCO and partners study populations of endangered Humpback Chub (Gila Cypha) on the mainstem Colorado River in Marble and Grand Canyons. This report documents the fall 2021 trip in the context of past findings and future recommendations.

Since 2000, AZFWCO has conducted studies in the lower 13.57 river kilometers (rkm) of the Little Colorado River (LCR) to estimate abundance and track trends in abundance of the Humpback Chub (Gila cypha), and to monitor other fishes. This report documents Mark-Recapture and Fish...

Report on the effectiveness of sodium sulfite as a piscicide for removal of non-native fish from native fish habitat.

Following introduction to the lower Colorado River, Flathead Catfish (Pylodictis olivaris) have had deleterious effects on native fishes of the lower Colorado River, most notably, the Razorback Sucker (Xyrauchen texanus). This report is intended to add to the limited knowledge...