Laserfiche WebLink
North Platte River Fish Survey - March n999 Page 34. <br />caught (332). Nine species were represented in the catch. Longnose dace comprised the most <br />abundant species captured (78 percent) with white sucker (7 percent) and johnny darter <br />(6 percent) comprising the second most abundant species. <br />Small numbers of central stone roller (0.3 percent), creek chub (0.6 percent), emerald shiner <br />(0.6 percent), longnose sucker (3.6 percent), sand shiner (2.4 percent), and spottail shiner <br />(1.2 percent) were captured. Figure 29 is the Camp Guernsey study site map, and Figures 30 and <br />31 show the habitat. <br />Fort Laramie National Park Service (NPS) Bridge - Backpack.— This sample site consisted of <br />a 300 -m section characterized as 100 percent main channel, and secondary habitat characterized <br />as 10 percent riffle and 90 percent run. Substrate consisted of a mix of small boulders, and large <br />and small cobbles 60 percent, and 40 percent silt. This sample location yielded the largest number <br />ofindividuals captured with the backpackelectrofisher -400 individuals of 11 species. Longnose <br />dace dominated the catch (72 percent) followed by juvenile and subadult white sucker <br />(8.5 percent) and johnny darter (6.5 percent). Central stoneroller (Gampostoma anomalum) <br />(1.8 percent), creek chub (1.3 percent), emerald shiner (2 percent), red shiner (1.8 percent), sand <br />shiner (2.3 percent), stonecat (1 percent), and yellow perch (0.25 percent) comprised the <br />remainder of the catch. The stonerollers had nuptial tubercles present on the head. We observed <br />eroded caudal fins on several longnose dace. Figure 32 shows the study site map, and Figures 33 <br />and 34 show the habitat. <br />Laramie River Confluence to Nebraska State Line. —The Laramie River added approximately <br />200 cfs to the North Platte River, allowing us to sample this reach of river with the raft. A total <br />of four raft electroftshing samples were conducted for this reach. <br />Grattan Diversion. Dam. (upstream) - Raft. — Permission was obtained from the landowner to put <br />the raft in at the Grattan Diversion Dam. We sampled both upstream of the dam and from the <br />dam downstream to the highway bridge. The primary habitat above the dam is 100 percent main <br />channel, with the secondary habitat comprised of 2 percent riffle and 98 percent pool. A total of <br />1.6 km was sampled. Substrate above the dam consisted of 80 percent silt and 10 percent small <br />cobbles. This was not a particularly productive site with only 33 individuals of 7 species being <br />captured. Part of this may be an artifact of sampling. This was, for the most part, a large deep <br />pool, but we stunned very few fish in the boulders along the edge, which compared to other raft <br />sample sites was unusual. Part of the reason may have been the substrate being predominately <br />silt with very little cover. The catch was dominated byjuvenile central stoneroller (27 percent), <br />juvenile and adult white sucker (27 percent), and by juvenile and adult longnose sucker <br />(18 percent). The catch also included common carp (65 percent), emerald shiner (3 percent), <br />Iongnose dace (9 percent), and spottail shiner (9 percent). We observed one white sucker <br />(102 -mm TL) that was blind in one eye, and another 113 -mm TL individual with an vljured tail. <br />Remits <br />