00000nam 2200000zi 4500 9.878802 CaOODSP 20221107165336 m o d f cr |n||||||||| 190903s1977 nscd #ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn--- Fs70-8/77-20E-PDF Clay, Douglas, 1948- author. Selection of silver hake (Merluccius bilinearis) in kapron codends : (a preliminary report) / Douglas Clay. Dartmouth, Nova Scotia : Department of Environment, Fisheries & Marine Service, Marine Fish Division, Bedford Institute of Oceanography, [1977] 1 online resource (57 pages) : charts. text txt rdacontent computer c rdamedia online resource cr rdacarrier CAFSAC res. doc. ; 77/20 "Not to be cited without permission of author." Includes bibliographical references (pages 9-10). "Selection is the variation of length frequency between a true population and what is caught and retained by the fishery. Selectivity is any factor that causes variation: Selectivity is important for two reasons. Firstly, it allows biologists who can rarely study a fish population directly, to use catch statistics more accurately to evaluate actual population numbers. This leads to more accurate assessment techniques and a better understanding of the population. Secondly, selectivity can be used as an important management tool to reduce mortality among juvenile and small fishes and increase the catch efficiency of larger fish"--page [1]. gccst Fisheries gccst Salt water fish Canada. Department of Fisheries and Oceans. Canada. Dept. of Fisheries and Oceans. Scotia-Fundy Region. Marine Fish Division. Canada. Fisheries and Marine Service. CAFSAC research document (Canadian Atlantic Fisheries Scientific Advisory Committee) 77/20 (CaOODSP)9.869616 PDF 2.05 MB https://publications.gc.ca/collections/collection_2019/mpo-dfo/Fs70-8-77-20-eng.pdf