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<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />L' <br />Figure 2. Minimum numbers of endangered fish required for developing <br />broodstocks of endangered fishes for primary and backup refuges in <br />the Upper Colorado River Basin. This diagram applies to the <br />' razorback sucker and Colorado squawfish that are expected to mature <br />in six years in the upper basin. Bonytail and humpback chub are <br />expected to mature at the end of the fourth growing season in the <br />' upper basin when 60 adults will be divided between the primary and <br />backup refuge. <br />23