Laserfiche WebLink
<br />" <br /> <br />001876 <br /> <br />e <br /> <br />e <br /> <br />GLOSSARY OF TERMS <br /> <br />Refugia - Individual fish representing genetically distinct stocks of a particular species <br />held in captive habitat. Usually held in reserve for use as Mure broodstock 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 a species by maintaining <br />representative examples of distinct, genetically diverse strains from specific native <br />habitats. <br /> <br />Broodstock - Sexually mature, preferably wild, adult fish of a particular species, <br />represented by both sexes which are held in captivity for 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 methodology which emphasizes more natural rearing <br />conditions for fish that are reared in an artificial environment. 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 alleviate hatchery induced pressures which <br />work selectively on the genetic diversity of the fish being cultured. <br /> <br />Intensive Culture - 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 are held at values which are <br />known to achieve maximum growth rates. Water flow rate are 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 fish production levels for a given rearing space <br />while maintaining healthy stocks of fish. <br /> <br />12- <br /> <br />.;' :~_:. ," <br />',,,,~~-. <br /> <br />..<-.- ___~;_Ji.~:..._;~;;j ___'.~- <br /> <br />~:-~4j~f;~;> ~---' <br /> <br />~---. '.- ." ..' ... <br />.'- '~:--,:,ilif~d:--~ <br /> <br />. -'~:'" <br /> <br /> <br />'~-.?'L'> '-' <br />