00000nam 2200000zi 4500 9.876310 CaOODSP 20221107164654 m o d f cr |n||||||||| 190715s1980 nkca #ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn--- Fs70-8/80-45E-PDF Aiken, D. E., author. Methods for estimating size at maturity of male Homarus americanus / D.E. Aiken and S.L. Waddy. St. Andrews, New Brunswick : Fisheries and Environmental Sciences, Department of Fisheries and Oceans, Biological Station, [1980] 1 online resource (10 pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier CAFSAC research document ; 80/45 "Not to be cited without permission of the authors." Includes bibliographical references (pages 9-10). "There are no convenient field techniques for the determination of maturity in lobsters, and attempts to develop one have been complicated by the existence of two states of maturity: physiological (presence of spermatozoa in the vasa deferentia) and functional (capable of successful mating). Changes in relative cheliped size appear to be associated with functional maturity, and this is the state of greatest interest to assessment biologists. Inflections in rate of crusher cheliped growth can be demonstrated on a weight:weight basis, but this is inconvenient for field use. Conventional allometric growth analysis for changes in cheliped volume will also reveal points of inflection, but these are only valid for the stock or sub-stock represented by the sample being analyzed, and the method cannot be used for maturity determination with individuals. In this paper a male maturity index - the Crusher Propodite Index, or CPI - is described which is convenient for field use, is applicable to all male lobsters irrespective of stock, and can be used to estimate maturity of individual lobsters as well"--Abstract. Includes abstract in French. gccst Fisheries gccst Crustaceans Waddy, S. L., author. Canada. Department of Fisheries and Oceans. Biological Station (St. Andrews, N.B.) CAFSAC research document (Canadian Atlantic Fisheries Scientific Advisory Committee) 80/45 (CaOODSP)9.869616 PDF 899 KB https://publications.gc.ca/collections/collection_2019/mpo-dfo/Fs70-8-80-45-eng.pdf