00000nam 2200000za 4500 9.829430 CaOODSP 20221107145303 cr ||||||||||| 170111s2016 oncabdo ob f000 0 eng d 978-0-660-07102-2 CaOODSP eng eng fre n-cn-sn Fs97-6/3192E-PDF Analysing the impact of freshwater aquaculture on wild fish populations using dual frequency identification sonar (DIDSON) technology [electronic resource] / E.C. Enders ... [et al.]. [Ottawa] : Fisheries and Oceans Canada, c2016. viii, 42 p. : ill. (mostly in col.), col. maps Canadian technical report of fisheries and aquatic sciences, 1488-5379 ; 3192 Cover title. Includes bibligraphical references (31-33). “Dual-frequency identification sonar (DIDSON) technology has been used for a wide range of fisheries applications. The DIDSON offers important advantages over other sampling techniques since surveys are non-invasive and do not require capturing, handling or disturbing fish or their environments. Consequently, DIDSON technology is well-suited for use in an aquaculture setting. DIDSON images are constructed from sound compared to light, allowing for DIDSON sampling 24 h a day and in all turbidity conditions. Using the DIDSON, we collected data on wild fish distribution and abundance before and after the development of a new aquaculture site at impact and control sites in Lake Diefenbaker, Saskatchewan. A standardized field protocol was established to improve the environmental monitoring design for DIDSON field studies on wild fish in pelagic environments. DIDSON recordings were standardised to detection-per-unit-effort (DPUE in number of fish ·10 m-3·2 h-1) in four depth strata for the three different study sites. DPUE at the Kadla cages were greatest during the early morning feeding period when large schools of fish (50 fish) were detected. In addition, gillnets were set to allow ground-truthing of the DIDSON footage. Six fish species (Cisco (Coregonus artedi), Walleye (Sander vitreus), Lake Whitefish (Coregonus clupeaformis), Yellow Perch (Perca flavescens), Goldeye (Hiodon alosoides), and Rainbow Trout (Oncorhynchus mykiss)) were caught during gillnetting with higher catch rates in the vicinity of the cages compared to the control site. DIDSON technology is valuable to assess the behaviour of wild fish surrounding aquaculture infrastructures"--Abstract, p. vii. Includes pref. matter and abstract in French. gccst Aquaculture gccst Animal populations gccst Freshwater fish gccst Environmental impact Enders, E. C. (Eva Claudia) Canada. Department of Fisheries and Oceans. Canadian technical report of fisheries and aquatic sciences, 1488-5379 ; 3192 (CaOODSP)9.504449 PDF 1.54 MB https://publications.gc.ca/collections/collection_2017/mpo-dfo/Fs97-6-3192-eng.pdf