Hydroacoustical parameters of fish in reservoirs with contrasting levels of eutrophication |
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| Institution: | 1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Earth Sciences, Goteborg University, Goteborg 40530, Sweden;4. International Center for Climate and Global Change Research, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, USA;5. Department of Environmental and Conservation Sciences, University of Swat, Swat 19130, Pakistan;1. School of Nursing and Midwifery, Griffith University, Queensland, Australia;2. Intensive Care Unit, Logan Hospital, Queensland, Australia;3. Menzies Health Institute, Queensland, Australia;4. School of Nursing, Midwifery and Paramedicine, University of the Sunshine Coast, Queensland, Australia;5. National Health and Medical Research Council (NHMRC), Centre of Research Excellence in Wiser Wound Care, Griffith University, Queensland, Australia;6. School of Medicine and Dentistry, Griffith University, Australia;7. Faculty of Medicine, University of Queensland, Australia;1. Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Natural Resources, Beijing 100081, China;2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;3. Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;5. Luminescence Dating Laboratory, University of Washington, Box 353412, Seattle, WA 98195-3412, USA;6. China University of Geoscience, Beijing 100083, China;7. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;1. School of Geography and Ocean Science, Nanjing University, Nanjing 210093, China;2. Meteorological Sciences Institute of Jiangxi Province, Nanchang 330096, China |
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| Abstract: | Hydroacoustical estimation of fish abundance and distribution is performed in three reservoirs that are characterised by different levels of eutrophication. The Biosonics 101 dual beam echosounder with a frequency of 420 kHz and the ESP software for acoustical data analyses are used. A clear dependence between fish density and the level of eutrophication is observed. In the mesotrophic Solina reservoir, fish abundance is over an order of magnitude lower than that in the eutrophic Dobczyce and Sulejów reservoirs. Fish length distributions have different shapes in the three reservoirs, which indicates the changes in fish size structure due to eutrophication; however, the mean target strength of fish does not differ significantly. These results suggest that hydroacoustically collected data may help to assess the ecological state of inland waters and may be used together with other methods in monitoring the water quality. |
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