00000nam 2200000zi 4500 9.879064 CaOODSP 20221107165420 m o d f cr bn||||||||| 190909s1978 nsca ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-nf x6x7 Fs70-8/78-35E-PDF Winters, G. H., author. Estimation of natural and total mortality rates of Northwest Atlantic mackerel / by G.H. Winters. [Dartmouth, N.S.] : [Canadian Atlantic Fisheries Scientific Advisory Committee], 1978. 1 online resource (10 pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier CAFSAC res. doc. ; 78/35 "Not to be cited without permission of author." "22 September, 1978." Digitized edtion from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (page 6). "The assessment of abundance and optimal yield levels of Northwest Atlantic mackerel (Scomber scombrus ) has generally been complicated by divergent conclusions as to the appropriate level of natural and fishing mortality rates. The level of natural mortality (M) currently being used in cohort analyses (M = 0.30) was arrived at more by compromise consensus than from data analyses. In addition estimates of terminal fishing mortality in 1976, for example range from 0.48 to 0.85. Although extensive data have been made available from commercial and research sampling activities during the past decade, these have not been analyzed with regard to definitive evaluation of the natural mortality rate of mackerel. Such analysis form the basis of this report"--Introduction. Issued also in print format. gccst Salt water fish gccst Fisheries Canada. Fisheries and Environment Canada. Canadian Atlantic Fisheries Scientific Advisory Committee. CAFSAC research document (Canadian Atlantic Fisheries Scientific Advisory Committee) 78/35. (CaOODSP)9.869616 PDF 558 KB https://publications.gc.ca/collections/collection_2019/mpo-dfo/Fs70-8-78-35-eng.pdf