Laserfiche WebLink
backwaters were selected at about the middle of each backwater, and <br />small shoreline seine hauls were made. <br />2. The investigators then proceeded to the beginning of the next B km <br />(5 mi) section and repeated the process. <br />3. In addition to the quantitative collections outlined above, <br />qualitative samples were t~ken if few fish were captured. A larval <br />seine 1 m long with 0.6 mm mesh was used to sample backwater and <br />shoreline habitats. Two replicate seine hauls were taken in each <br />habitat. All fishes large enough to identify in the field were <br />segregated and enumerated by species at the time of collection. <br />Unidentified fishes were lumped into one SY, formalin sample. <br />4. All larval samples were preserved in SX formalin solution and <br />shipped to Larval Fish Laboratocy, Colorado State University for <br />sorting and identification. <br />A special pilot study of larval drift was conducted in 1982 in the Green <br />River using 1 m2 diameter ichthyoplankton nets. These nets were constructed <br />of 0.76 mm2 mesh wall and 0.51 mm2 mesh cod end. Each net was suspended in <br />mid-channel from a cross channel guide wire attached to metal fence posts <br />driven into the shorelines. The nets were weighted fore and aft and floated <br />with plastic bottles. The nets were set for 10 min duration at 0600, 1200, <br />1800 and 2400 hours. Water temperature (C) and velocity (ft/sec) were <br />recorded at the net location for each sample period at the following <br />locations: <br />1. Green River immediately above the mouth of the Yampa River (RM 345 <br />(RK 552)). <br />2. Yampa River near the mouth (RM 0.3 (RK 0.5)). <br />3. Green River below Split Mountain Canyon (RM 314.9 (RR 504)). <br />4. Green Rivet immediately above the mouth of the White River (RM <br />246.3 (RK 394)). <br />5. Green River below the mouth of the White River (RM 245.5 (RK 393)). <br />16 <br />