Laserfiche WebLink
1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />i <br />t <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />potential threat to rare fishes because it does not depend on handling large numbers of the rare <br />species. <br />Northern pike were sampled and radio-tagged during the spring (May-June) of 1993 in the Ouray <br />section of Crreen River. Twenty-nine pike were tagged by the end of June 1993 and their <br />movements estimated. Radio-tagged pike were located monthly from June 1993 through May <br />1994. Recaptured pike were periodically weighed and measured to obtain growth rates. In <br />addition, five pike were followed continuously over a 24 h period to determine diel movement <br />patterns during summer, fall and spring. During the spring of 1994, all captured pike were <br />weighed, measured, and stomach contents were removed for later enumeration. These data, as <br />well as the observed temperature regime (where pike were observed) were used as parameter <br />inputs for a bioenergetics model to estimate the total biomass offish consumed that resulted in the <br />observed growth rates. Simulations were then performed to determine the quantity of squawfish <br />consumed if they composed different percentages of the overall diet. To augment our diet data, <br />stomach data, obtained by T. Nesler, was also incorporated into the modeling efforts. <br />Pike showed very little daily or seasonal movement. On average, pike moved at a rate of 43.7 <br />m/h during the day and 5.9 m/h during the night. At the monthly scale, pike move from 0.2 to <br />2.6 miles per day with an average of 0.56 miles per day. Across the annual sampling regime, pike <br />averaged 4.9 miles of upstream movement. One fish moved 120 miles during the duration of the <br />study. <br />viii <br />