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<br />09/0'1/92 <br /> <br />.:'16 <br /> <br />UP.S COt-'SUL TAt-IT DENI)EP. <br /> <br />016 <br /> <br />.~001852 <br /> <br />e <br /> <br />;\~~.~:) 1:. . <br />~.t:: .~.~ : ':'" : ' <br />.~: :;f. . <br /> <br />GLOSSARY OF TeRMS <br /> <br />.... . . -$~{;lhdMdt;iI,i1sh..'repi'ea.ntlng.Uenetioally distinct atoeke of a pa;t;oular specl.. . <br />held In captive habitat. Usually held in reserve for use as ifuture broodatock and to <br />provide an environment for protection and survival of declining number of endangered fish <br />in the wild. The purpose Is to maintain the genetic diversity of . species by maintaining <br />representative examples of distinct, genetically diverse strains from specific native <br />habitats. ' <br /> <br /> <br />BrooCl8tock - Sexually mature, preferably wild, adult fish of a particular species. <br />represented by both Sexes which are heles in captivity fdr the distinct purpose of <br />crossbreeding. The genetic history is usually known for these animals and they are <br />usually bred according to strict protOCOls designed to maintain a natural level of genetic . <br />diversity in the progeny. . . <br /> <br />Extensive culture . A culture methouoloyy wl1it;11 empl1aslze5 more natural roaring <br />conditions for nsh that are reared In an artificial environmon~. Under extensive culture <br />conditions fish are reared at low density in outdoor ponds': Rearing Is conducted at <br />ambient temperatures and natural feed Items are encouraged to grow in the pond <br />environment. This strategy Is employed to allevlato hatcherY induced pressures which <br />work selectively on the genetic divorsity of the fish being cultured. <br /> <br />Intensive CulturG . A culture methodology designed to achieve maximum productivity for <br />fish held in artificial culture environments. The fish are held at higher densities in tanks <br />or raceways and fed an artificial diet. Rearing temperatures Bre held at values which are <br />known to achieve maximum growth rates. Water flow rate 1are high to maintain water <br />quality by carrying away excreted metabolites, and excess feed. The primary goal of <br />intensive culture is to achieve maximum fisn production levels for a given rearing space <br />while maintaining healthy stoeks of fish. <br /> <br />12 <br />