Laserfiche WebLink
<br />. <br /> <br />3-3 <br /> <br />calculations of fish densities as numbers per 1000 cubic <br />according to the following equation: <br />Ne = (N / ((A x Vm) x T)) x 1000 <br />where: Ne = estimated number of drifting fish per 1000 <br />cubic feet of water, <br />N = actual number of fish recovered from the <br />drift sample, <br />A = area of net opening in square feet (1.5), <br />Vm = average water velocity in feet per second at <br />net opening during set; (initial + ending <br />velocity / 2), and <br />T = total time of set in seconds. <br /> <br />feet of water <br /> <br />3.2 Laboratory Procedures <br />The material collected in each drift net was placed in an individually- <br />labeled Ziploc plastic bag with 10% formalin as a preservative. All fish <br />within each sample were sorted from the drift material and placed in <br />individually-labeled glass vials with 5% formalin. Each fish was then <br />examined microscopically to identify the specimen, measure it, and determine <br />its stage of development. Identification was based on criteria presented <br />in Snyder (1981) and Auer (1982). These larval fishes are in the ERI <br />collection in Logan, Utah, and are available for examination upon request. <br />All larval fishes captured with seines and dip nets were identifed in <br />the same manner as described above. The juvenile and adult fishes captured <br />with electrofishing, seines and dip nets were identified afield and released <br />alive, except for voucher specimens preserved in 10% formalin and <br />transferred to CDOW. <br />