Laserfiche WebLink
25 <br />Spawning bar substrate characterization <br />Ten transects were established to characterize substrate at the Green River <br />spawning bar. Transects were placed 10-20 m apart and extended from the north bank of <br />.AOL the spawning channel to the north bank of the large mid-channel island. During the <br />recessional limb of the 2000 runoff, substrate was determined at 0.5 m intervals along <br />each transect. Substrate was coded using a modified Wentworth particle size scale <br />(Bovee 1986). Substrate data were mapped and plotted with fish positions to examine <br />patterns in substrate use. <br />Biological data collection <br />Collection of Razorback sucker <br />Razorback sucker were captured by electrofishing (Smith Root GGP transducer <br />mounted in a jon boat). Three to six passes were made over the spawning bar weekly <br />from May 1 - 22 2000. All razorback sucker captured were placed into a live well after <br />each pass. Each fish was examined for a Passive Integrated Transponder (PIT) tag, <br />weighed (nearest 0.1 of a gram), measured (TL mm), and sexed for identification (i.e., <br />presence of tubercles, express milt or eggs); those fish without a PIT-tag were tagged. <br />Prior to release, records were consulted for the origin of the fish (i.e., wild or hatchery). <br />As part of an independent recovery program element related to development of genetic <br />refugia and brood stock for a future stocking program, all wild females and a limited <br />number of wild males were removed from the river and taken to Ouray National Fish <br />Hatchery.