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WILLIS, MURPHY, AND GUY <br />REVIEWS IN FISHERIES SCIENCE <br />TABLE 1 <br />Number of State and Provincial Conservation Agencies Reporting Use of <br />Proportional Stock Density (PSD) or Relative Stock Density (RSD) As a <br />Standard Tool for Assessment of Length-Frequency Data <br /> <br />Species States or provinces using <br />PSD/RSD Similar index <br />Warmwater fishes <br />Largemouth bass 33 2 <br />Bluegill 25 2 <br />Smallmouth bass 20 2 <br />Crappies 17 2 <br />Channel catfish 8 2 <br />Striped bass 5 0 <br />White bass 5 2 <br />Coowater fishes <br />Walleye 13 2 <br />Northern pike 7 2 <br />Yellow perch 7 2 <br />Muskellunge 4 0 <br />Coldwater fishes <br />Rainbow trout 6 2 <br />Brown trout 5 2 <br />Brook trout 4 2 <br />Lake trout 1 2 <br />From Gabedbouse et al., 1992 <br />ll. HISTORY/DEVELOPMENT <br />A. DEFINITIONS <br />Proportional stock density (PSD; Anderson, 1976) was defined as: <br />PSD =Number of fish >_ quality length x 100 <br />Number of fish >_ stock length <br />Relative stock density (RSD) was developed by Wege and Anderson (1978) and <br />is calculated as: <br />RSD -Number of fish > specified length x 100 <br />Number of fish > stock length <br />Proportional Stock Density <br />Gabelhouse (1984a) summarized the early development of PSD and other stock <br />density indices. The first uses of PSD, not yet named, can be seen in Johnson and <br />Anderson (1974) and Anderson (1975)• Anderson (1976) coined the term PSD for this <br />size structure index and also defined "stock" length. Stock length has been variously <br />defined as the approximate length at maturity, minimum length effectively sampled <br />by traditional fisheries gear, and the minimum length of fish that provide recreational <br />204 <br />