Flow velocity preference of Schizothorax oconnori Lloyd swimming upstream
Schizothorax oconnori Lloyd is a local endemic species, one of the most frequently observed species in the Tibet plateau, China, and the representative species of cold-water fish in the Yarlung Zangbo River basin. Knowing the flow velocity preference of fish is essential for understanding the mechan...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-12-01
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| Series: | Global Ecology and Conservation |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2351989421004522 |
| _version_ | 1818352738256289792 |
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| author | Yan Liang Yiqun Hou Wangbin Hu David Johnson Junxing Wang |
| author_facet | Yan Liang Yiqun Hou Wangbin Hu David Johnson Junxing Wang |
| author_sort | Yan Liang |
| collection | DOAJ |
| description | Schizothorax oconnori Lloyd is a local endemic species, one of the most frequently observed species in the Tibet plateau, China, and the representative species of cold-water fish in the Yarlung Zangbo River basin. Knowing the flow velocity preference of fish is essential for understanding the mechanics of their locomotion, and part of the biological foundation required for habitat restoration. The flow velocity preference of Schizothorax oconnori swimming upstream was investigated using a four-channel flume. The flow fields in each channel were nearly uniform, but the flow velocity varied by channel. Test fish swam upstream, of their own volition, into a channel and were recorded by PIT (Passive Integrated Transponder) antennas as they entered the channel. The proportion of fish entering each channel was recorded and changes in activity level during the experiment were analyzed to detect diurnal and nocturnal cycles of activity. The choice among channels made by the test fish differed significantly, indicating that Schizothorax oconnori display a preference for flow velocity. Furthermore, it was demonstrated that the preference for flow velocity varied by season, with a preference for relatively high velocity in late July and a relatively low velocity in late August. This variation in preference may be attributed primarily to different feeding strategies in the two seasons and to differing maximum flow velocities in the two experiments. Due to fatigue, or acclimation to the constant flow field, fish activity decreased significantly after 10 h. Schizothorax oconnori was more active at night than during the day, attributed to its benthic nature and the relatively high light level in the shallow flume. Based on our findings, we make the following recommendations for fish passage design: (1) The flow field should be non-uniform to accommodate a flow preference that varies with season, and which helps prevent fatigue; (2) Avoid excessively long fish passageways and provide a combination of water depth and shading that provides a satisfactory light level. |
| first_indexed | 2024-12-13T18:58:24Z |
| format | Article |
| id | doaj.art-1f6065855e1c467f99f04addc437da89 |
| institution | Directory Open Access Journal |
| issn | 2351-9894 |
| language | English |
| last_indexed | 2024-12-13T18:58:24Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Global Ecology and Conservation |
| spelling | doaj.art-1f6065855e1c467f99f04addc437da892022-12-21T23:34:45ZengElsevierGlobal Ecology and Conservation2351-98942021-12-0132e01902Flow velocity preference of Schizothorax oconnori Lloyd swimming upstreamYan Liang0Yiqun Hou1Wangbin Hu2David Johnson3Junxing Wang4State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, ChinaKey Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute of Hydroecology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan 430079, China; Corresponding authors.Key Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute of Hydroecology, Ministry of Water Resources and Chinese Academy of Sciences, Wuhan 430079, ChinaSchool of Natural Sciences and Mathematics, Ferrum College, Ferrum, VA 24088, USAState Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; Corresponding authors.Schizothorax oconnori Lloyd is a local endemic species, one of the most frequently observed species in the Tibet plateau, China, and the representative species of cold-water fish in the Yarlung Zangbo River basin. Knowing the flow velocity preference of fish is essential for understanding the mechanics of their locomotion, and part of the biological foundation required for habitat restoration. The flow velocity preference of Schizothorax oconnori swimming upstream was investigated using a four-channel flume. The flow fields in each channel were nearly uniform, but the flow velocity varied by channel. Test fish swam upstream, of their own volition, into a channel and were recorded by PIT (Passive Integrated Transponder) antennas as they entered the channel. The proportion of fish entering each channel was recorded and changes in activity level during the experiment were analyzed to detect diurnal and nocturnal cycles of activity. The choice among channels made by the test fish differed significantly, indicating that Schizothorax oconnori display a preference for flow velocity. Furthermore, it was demonstrated that the preference for flow velocity varied by season, with a preference for relatively high velocity in late July and a relatively low velocity in late August. This variation in preference may be attributed primarily to different feeding strategies in the two seasons and to differing maximum flow velocities in the two experiments. Due to fatigue, or acclimation to the constant flow field, fish activity decreased significantly after 10 h. Schizothorax oconnori was more active at night than during the day, attributed to its benthic nature and the relatively high light level in the shallow flume. Based on our findings, we make the following recommendations for fish passage design: (1) The flow field should be non-uniform to accommodate a flow preference that varies with season, and which helps prevent fatigue; (2) Avoid excessively long fish passageways and provide a combination of water depth and shading that provides a satisfactory light level.http://www.sciencedirect.com/science/article/pii/S2351989421004522Schizothorax oconnoriFlow velocity preferenceNon-uniform flowFlow preference variation |
| spellingShingle | Yan Liang Yiqun Hou Wangbin Hu David Johnson Junxing Wang Flow velocity preference of Schizothorax oconnori Lloyd swimming upstream Global Ecology and Conservation Schizothorax oconnori Flow velocity preference Non-uniform flow Flow preference variation |
| title | Flow velocity preference of Schizothorax oconnori Lloyd swimming upstream |
| title_full | Flow velocity preference of Schizothorax oconnori Lloyd swimming upstream |
| title_fullStr | Flow velocity preference of Schizothorax oconnori Lloyd swimming upstream |
| title_full_unstemmed | Flow velocity preference of Schizothorax oconnori Lloyd swimming upstream |
| title_short | Flow velocity preference of Schizothorax oconnori Lloyd swimming upstream |
| title_sort | flow velocity preference of schizothorax oconnori lloyd swimming upstream |
| topic | Schizothorax oconnori Flow velocity preference Non-uniform flow Flow preference variation |
| url | http://www.sciencedirect.com/science/article/pii/S2351989421004522 |
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