The Apache trout, Oncorhynchus apache, is a species of freshwater fish in the salmon family (family Salmonidae) of order Salmoniformes. It is one of the Pacific trouts. Description The Apache trout measures in length from , and weighs between . It rarely exceeds , but can reach up to in its native, headwater streams. Apache trout are a yellowish-gold color with a golden belly and have medium-sized dark spots that are evenly spaced and that may extend below the lateral line and onto the dorsal and tail fins. The top of its head and back are dark olive in color, and it has the appearance of having a black stripe/mask through each of its eyes, due to two small black dots on either side of the pupil. There can be a throat mark below the lower jaw, ranging in color from yellow to gold. Distribution The Apache trout is the state fish of Arizona, and is one of only two species of trout native to that state, with the other being the gila trout (O. g. gilae). It natively lives in clear, cool streams in the White Mountains that flow through coniferous forests and marshes, but has been introduced into several lakes in the area. The Apache trout is native to the upper Salt River watershed (Black and White rivers) and the upper Little Colorado River watershed. Apache trout have been introduced into isolated streams outside of their historic range in the Pinaleno Mountains and the North Rim of the Grand Canyon. Life history The Apache trout spawns from March to the middle of June, and varies with elevations. Maturity was found to occur in three years, and fecundity is based on the size of trout. One female typically produces from 72 to 240 eggs in fish and from 646 to 1,083 eggs in fish. The eggs hatch after 30 days. The Apache trout eats both terrestrial and aquatic insects, such as Trichoptera and Diptera. In lakes, they also eat small fishes and zooplankton. Conservation Recovery and management efforts for Apache trout have been ongoing since the 1940s. Apache trout are raised in federal and state hatcheries, and reared fish have been used to assist with recovery and to maintain populations for sport fishing in certain streams and reservoirs. While the IUCN considers the Apache trout to be critically endangered, it is listed as threatened under the Endangered Species Act.