Laserfiche WebLink
Fish sampling for small and young-of-the-year fish raa done by <br />seining shallow areas is the main river channel and coamccted and iso- <br />lated backwaters. The seine used for these collections vas a 1/8' mesh <br />and 15 foot long supported by two, 8 foot long poles. Les~ths of seine <br />hauls varied depending on substrate conditions and the nvzber of small <br />fish that were collected. After each haul, all of the small fish were <br />either field identified or preserved in formaldehyde for identification <br />under laboratory conditions. All rare or endangered fish seined were <br />measured to standard length and also, if possible, to total length. <br />Sabitat measurements were taken of all areas seined as described in the <br />San Juan River Rare and Endangered Fish Work Statement. <br />Physical Data Collections <br />All, apparrent permanent backwaters were identified and mapped <br />adjacent to the rlverine portions of the river. These backwaters were <br />described by measuring their lengths, widths, depths, water temperature <br />and substrate composition. In addition, the main San Joan River chan- <br />nel vas profiled at several locations by measuring eater depths across <br />the channel . <br />Water floe data vas obtained f rom the National Qeather Service <br />which had compiled data from the U.S.G.S. gaging station at Bluff, <br />Gtah. <br />6 <br />