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<br />I <br /> <br />131)~' <br />... ,) <br /> <br />.' <br />;:; <br />, <br /> <br />of the two drift netting sites during the tenure of drift sampling. Those samples are still being <br />processed. <br /> <br />If a similar sampling opportunity is available during 1999, we will probably reduce the number <br />of drift-nets and increase sampling with the MEC. Comparative data from 1998 samples will <br />be analyzed to determine differences in sampling efficiency between devices. Depending upon <br />the results of this analysis (which will be completed in early 1999), we will consider switching <br />sampling gear for both phases of this research project (larval drift netting and sampling below <br />the spawning bar). <br /> <br />Obiectives: <br /> <br />1.) Determine the temporal distribution of San Juan River ichthyoplankton in relation <br />to the hydrograph <br /> <br />2.) Provide comparative analysis of the reproductive success of San Juan River fishes <br /> <br />3.) Attempt to characterize downstream movement of ichthyoplankton <br /> <br />4.) Attempt to validate presumed spawning period of Colorado River pikeminnow <br /> <br />5.) <br /> <br />Institute a short-term but intensive sampling regime in the. proximity of the <br />presumed Colorado pikeminnow spawning bed using the MEC as the principal <br />collecting device. <br /> <br />. ~' <br />.". <br /> <br />Table 1. Summary of larval and YOY Colorado pikeminnow collected in the San Juan <br /> River during larval drift-netting (1993-1998) and back-calculated dates of <br /> spawning. <br />Field MSB Catalog Number Total Date Date River Sampling <br />Number Number specimen Length Collected Spawned Mile Method <br />MH72693-2 18098 1 9.2 26 Jul 93 08 Jul 93 53.0 drift netting <br />MH72793-2 18099 1 9.2 27 Jul 93 09 Jul 93 53.0 drift netting <br /> <br />JPS95-205 <br />JPS95-207 <br /> <br />26187 <br />26191 <br /> <br />1 <br />I <br /> <br />9.2 <br />9.0 <br /> <br />02 Aug 95 15 Jul 95 53.0 drift netting <br />03 Aug 95 17 Jul 95 53.0 drift netting <br /> <br />WHB96-o37 <br />TOTAL <br /> <br />29717 <br /> <br />1 <br />5 <br /> <br />8.6 <br /> <br />02 Aug 96 18 Jul 96 128.0 drift netting <br /> <br />Work Plan FY99.wpd <br /> <br />7 <br /> <br />Budget and Work Plan FY99 <br />