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<br /> <br />Rapid growth has been documented for juveniles that have been stocked in ponds and <br />st <br />O <br />reams. <br />smundson and Kaeding (1989) reported growth from 55 mm to 307 mm TL <br />in 6 months for fish stocked in a small pond near Clifton, Colorado. Two years and <br />seven months after this stocking, the survivors had a mean length of 422 mm. <br />Juveniles of 40 mm TL that were stocked in two stream locations rew <br />g an average of <br />43.4 and 47.5 mm in two months (Brooks 1986). Growth of fish stocked in two isolated <br />backwaters on Bonita Creek Arizona, averaged 6 to 36 mm respectively, in three <br />months Brooks 198 <br />( 6). <br /> <br /> <br />nth any rare or endangered species, there is concern about loss of genetic diversity in <br />small or isolated populations. A reduction of genetic diversity is a concern for the <br />razorback sucker not only for extant populations, but also for hatchery stocks as well. <br />Reduced ,genetic diversity and adaptation to captivity could impair prospects for <br />succe <br />f <br />l <br />i <br />ss <br />u <br />re <br />ntroduction of the species. <br /> <br />In a recent study of genetic diversity in hatchery and Lake Mohave stocks, Dowling et <br />al. (1996 concluded that on the <br />basis of mrtochondnal DNA (m,DNA) diversity, the <br />large stock in Lake Mohave had a high degree of m,DNA diversity (0.97), suggesting <br />that the population was descended from a large panmictic population. Although the <br />hatchery stocks had lower m,DNA diversity (0.71-0.91), Dowling et al. (1996) <br />considered it adequate. An earlier, preliminary study also examined haplotypes, <br />24 <br /> <br />