00000nam 2200000za 4500 9.838419 CaOODSP 20221107151356 cr ||||||||||| 170616s1976 oncba #o f000 0 eng d CaOODSP eng eng fre n-cn-mb Fs97-7/640E-PDF Lake whitefish (Coregonus clupeaformis (mitchill)) in Southern Indian Lake, Manitoba [electronic resource] / by H.A. Ayles. Winnipeg : Department of the Environment, Fisheries and Marine Service, Research and Development Directorate = Ministère de l'Environnement, Service des Pêches et des Sciences de la mer, Direction de la Recherche et Développement, 1976. vi, 28 p. : maps, ill. Technical report = Rapport technique ; no. 640 "This is the eighty-ninth Technical Report from the Research and Development Directorate, Freshwater Institute, Winnipeg, Manitoba." Digitized edition from print. Includes bibliographic references. The spawning and population characteristics of lake whitefish, (Coregonus clupeaformis), from Southern Indian Lake, are discussed. Whitefish spawn in shallow areas of rock and boulders. Temperature appears to trigger the spawning act. Whitefish (males and femailes) mature at an average age of 8.8 years. Growth and condition are good for lake whitefish in most regions of this large and complex lake. Different year class strengths appear to exist. Mortality rates vary from 0.43-0.70. The flow of the Churchill River through this lake has a strong influence on the productivity of the lake and therefore on the available commercial yield of whitefish. Commercial fishing of whitefish yields, on the average, 400, 000 kilograms per year. Electronic monograph in PDF format. gccst Lakes gccst Freshwater fish Ayles, H.A. Canada. Fisheries and Marine Service. Research and Development Directorate. Freshwater Institute (Canada) Canada. Fisheries and Marine Service. Technical report (Canada. Fisheries and Marine Service. Research and Development Directorate) no. 640 (CaOODSP)9.838135 PDF 1.31 MB https://publications.gc.ca/collections/collection_2017/mpo-dfo/Fs97-7-640-eng.pdf