Mature individuals generally have a rounded belly. Colorado pikeminnow Match mismatch hypothesis Ontogenetic diet shift Hydrologic regime Spawning chronology Predator prey relationship ABSTRACT Understanding how altered ow regimes mediate interactions among native and nonnative species is necessary for the conservation of aquatic systems. The fins are clear, however males display yellow/orange lower fins during spawning periods. After hatching, young pikeminnow larvae, drift downstream and then move to shoreline areas and backwaters. The Colorado pikeminnow was a valued food source by early settlers. 1982). Their head is relatively long, approximately 22% to 23% of the total length. “I remember a fish like that really was a harvest, and it produced not just one meal, but quite a few meals for the family.” (Also Adult Colorado pikeminnow are predators whose food is mainly other fishes. Adult pikeminnows use various habitats which include deep, turgid, strongly flowing waters, eddies, runs, flooded bottoms or backwaters (especially during high flows). The San Juan River Basin Recovery Implementation Program continues to stock Colorado pikeminnow to develop a separate, self-sustaining population. Today two wild populations of the Colorado pikeminnow are found in the Upper Colorado River Basin. DIET: Young pikeminnows feed on insects and plankton. Essential habitats, including primary migration routes and required stream flows are legally protected. SIZE: The common length of the Colorado pikeminnow is 52.5 cm (20.7 in) with the longest reported length being 180 cm (70.9 in). Recruitment actually increased as of 2011.