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Effect of a vertical half cylinder on swimming of silver carp, Hypophthalmichthys molitrix : Implications for microhabitat restoration and fishway design
Author(s) -
Ke Senfan,
Li Zhimin,
Jiang Zewen,
Goerig Elsa,
Kynard Boyd,
Liu Defu,
Shi Xiaotao
Publication year - 2019
Publication title -
river research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.679
H-Index - 94
eISSN - 1535-1467
pISSN - 1535-1459
DOI - 10.1002/rra.3416
Subject(s) - hypophthalmichthys , silver carp , cylinder , hydraulics , substrate (aquarium) , environmental science , flow (mathematics) , fish <actinopterygii> , fishery , hydrology (agriculture) , geology , oceanography , geotechnical engineering , mechanics , biology , physics , engineering , mechanical engineering , thermodynamics
In recent years, the relationship between hydraulics associated with the substrate and fish swimming behaviour has become increasingly important to the design of microhabitat around substrates for river restoration. To better understand the hydraulics associated with substrate on fish swimming, we studied the effects of a vertical half cylinder (hereafter, cylinder) on the critical swimming speed of juvenile silver carp ( Hypophthalmichthys molitrix ). Absolute and relative critical swimming speeds of fish in the flow field of the cylinder were significantly increased compared with those swimming in free flow. In addition, the amplitude of fish head and tail oscillations were significantly greater in flows created by the half cylinder. This study highlights the importance of roughness elements in stream microhabitat restoration and, possibly, for fishway design.