00000nam 2200000zi 4500 9.872486 CaOODSP 20221107163646 m o d f cr ||||||||||| 190503s1980 nscab||#ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn-nf Fs70-8/80-69E-PDF Sharp, G. L., author. The impact of Chondrus dragraking on substrate stability in southwestern Nova Scotia / by G.J. Sharp and D.L. Roddick. Halifax, Nova Scotia : Resource Branch, Department of Fisheries and Oceans, [1980]. 1 online resource (iii, 14 pages) : illustrations, map. text txt rdacontent computer c rdamedia online resource cr rdacarrier CAFSAC research document ; 80/69 Caption title. Also published as No. 1593 of series: Canadian manuscript report of fisheries and aquatic sciences (see Fs97-4/1593E-PDF). Digitized edtion from print [produced by Department of Fisheries and Oceans]. "Not to be cited without permission of authors." Includes bibliographical references (page 14). "Dragrakes and handrakes are the Chondrus crispus harvesting tools in southwestern Nova Scotia. Reports of serious substrate damage by the dragrake prompted an extensive survey and experimental program by the Marine Plants Section of Resource Branch, Department of Fisheries and Oceans, in 1979. Dragrakes were found to overturn rocks up to 58 cm x 43 cm maximum dimensions. The total bottom disruption averaged 0.6% to 4.8% of the bottom area, reaching a maximum of 6.8%. Substrate disruption was cumulative - up to eight hours of dragging the same area. The average size of displaced rocks was constant (0.05-0.07 m 2 ) after the peak of harvesting effort. Dragraking was restricted to 43% of the commercial Chondrus beds surveyed and to 11% of the harvest effort. Damage to the resource was sufficient to recommend the development of new harvest methods and phasing out of the dragrake"--Abstract. Includes abstract in French. gccst Fisheries gccst Fisheries technology Roddick, D. L., author. Canada. Department of Fisheries and Oceans. CAFSAC research document (Canadian Atlantic Fisheries Scientific Advisory Committee) 80/69 (CaOODSP)9.869616 PDF 1.03 MB https://publications.gc.ca/collections/collection_2019/mpo-dfo/Fs70-8-80-69-eng.pdf