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<br />000179 <br /> <br />, <br /> <br />Survival of stocked rainbow fingerlings in the CWA section of the Rio <br />Grande continues to be lower than that in the SB section. Attributing all of <br />the "wild" rainbows and adipose-clipped rainbows collected in 1987 to the 1986 <br />plants results in an estimate of 2.6%'survival over one year, 'compared to an <br />estimated survival of 4.35% for the 1986 cohort of CRR strain rainbow in the <br />SB section. <br /> <br />However, the estimated survival rate for the CRR strain rainbow was 3.0%, <br />while the surviv~l of BELL strain rainbow was estimated at 0.33%, an order of <br />magnitude lower than the CRR strain. This is much lower than the estimated <br />survival of the BELL strain plant of 3..78% for the 1986 cohort in the SB <br />section. Considering that the average size of the BELL strain rainbows was <br />12.5 cm (4.9 in.) at stocking versus an average size of 5.1 cm (2 in.) for the <br />1986 CRR strain cohort, the cost~effectiveness of the CRR strain rainbows is <br />obvious. The cost per 1,000 two-inch fingerlings at Roaring Judy Hatchery <br />(the source of most ,of the 1986 plants in the Rio Grande) is $35.07'versus <br />$lOO.l4 per l,OOO for the 5-inch fingerlings. Thus, the CRR strain rainbow <br />are approximately three times more cost-effective and they survive at a higher <br />rate. The cost of ,the 1986 BELL plant should be adjusted for the l5% poorer <br />survivaLrate(compared to the 1986 CRR plant). Thus, the true cost is <br />$ll5.24, which is 3.24 times greater than the cost of the CRRstrain. <br /> <br />The economic comparisons of the two strains (Bell and CRR) are more <br />dramatic on the CWA section. Reiterating, the estimated survival of the 1986 <br />CRR cohort was 3.0% versus 0.33% for the BELL strain. Thus, survival of the, <br />CRR strain was 9.09, times higher, making the real cost of the BELL cohort, <br />$910.27 per l,OOO fingerlings or approximately 26 times more costly, i.e., <br />$910.27 versus $35.07 per 1,000 fingerlings. <br /> <br />The 1986 year-class of "wild" rainbows for the RGFA was estimated at 794. <br />If all of these fish were considered to be survivors of the 1986 plant of <br />'13,300 CRR rainbows, ,the estimated survival would be 5.97%, somewhat better <br />than both the SBand CWA sections. No BELL strain rainbow were stocked in the <br />RGFA section in 1986. <br /> <br />"" . <br /> <br />I] ll0002406 <br />