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<br />squawfish grew about 50 !TIn per year, until after year 3 when annual <br />increments increased for a couple of years, then decreased as the fish <br /> <br />became larger. Three year old f~sh were about 162 !TIn total length, age <br />I <br />4 fi sh were 238 mm, age 5 320 0111, and age 8 fi sh 499 !TIn. Seetha 1 er <br />(1978) found similar growth rates for older fish from the Colorado and <br /> <br />Yampa rivers. <br /> <br />Fish from the lower Green River, where water temperatures warm <br /> <br />sooner each year, probably grew faster. Holden (1977) found young-of- <br />the-year in Gray Canyon were larger than those reported by Vanicek and <br />Kramer (1969) from the Upper Green River at about the same age. <br />Squawfish are old aged fish;) Vanicek and Kramer (1969) found an 11 <br />year old, 610 !TIn female. Since fish of 700-900 Il1TI have recently been <br />caught, and the old reports of 2 m specimens appear valid, the potential <br />life of squawfish must be 20-50 years or more. <br /> <br />Length-Weight Relationship <br /> <br />The Colorado squawfish is a relatively elongated fish, very much <br />pike-like. Fish under 400 rrm are often quite thin. Vanicek and Kramer <br />(1969) reported a weight-length relationship of log W = -5.4177 + 3.126 <br />log L for fish from the upper Green River. Seethaler (1978) calculated <br />similar relationships for squawfish from the Colorado and Yampa-Green <br />rivers. This formula indicates that the weight of squawfish increases <br />slightly faster than the cube of the length (Vanicek and Kramer 1969). <br /> <br />4 <br />