Laserfiche WebLink
<br />Length frequency comparisons of northern pike and Colorado squawfish <br />collected from the same habitat types (backwaters, pools, eddys) indicated <br />river populations of both species occupy the same general length range (Figure <br />4). ehi-square analysis of these distributions indicated, however, that the <br />two distributions were significantly different at the P=O.Ol level. The <br />eo1orado squawfish population consisted more of fish in the 520-640 mm length <br />range, while the northern pike population consisted of considerably more fish <br />in the 680-720 mm length range. There was also a greater abundance of larger <br />pike in the 760-960 size range compared to Colorado squawfish (21 vs 11). <br />Stomach sampling of northern pike was minimal in 1987-1988 due to the <br />priority of tagging and releasing captured fish back into the river to acquire <br />movement and recapture data. A few captured pike regurgitated identifiable <br />fish prey. One pike 541 mm long had eaten a speckled dace (Rhinichthys <br />osculus) 76 mm long and another pike 947 mm long had eaten a 335 mm roundtail <br />chub (Gila robusta). Three pike ranging in length from 638 to 945 mm had <br />empty stomachs. <br /> <br />Channel catfish - Yam~a River <br />Forty-nine channel catfish were collected during sampling in 1987-1988 <br />(Table 2). None were found in the Hayden-Craig reach and very few were <br />observed in both the Juniper Springs and Maybe1l-Sunbeam reaches. The <br />majority were sampled from two backwaters above the old confluence of the <br />Little Snake River at RM 51.5. Six other channel catfish were sampled via <br />trot1ines and trammel nets at the confluence of the Yampa River with the Green <br />River in Echo Park (Dinosaur National Monument). The uppermost river mile at <br />which channel catfish were sampled was RM 103.4. <br /> <br />14 <br /> <br />.' <br />