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<p>The endangered anadromous naked carp <i>Gymnocypris przewalskii</i> is a rare fish species found in Qinghai Lake, China. Studying the swimming abilities of naked carp is crucial for enhancing the design of passageways for these unique fish. Two regression models were employed to assess the influence of salinity, water temperature, body size, and gender on induced flow velocity (U<sub>ind</sub>), critical swimming speed (U<sub>crit</sub>), burst swimming speed (U<sub>burst</sub>), and endurance in naked carp. The findings pointed toward the fact that larger fish under-performed smaller fish for (U<sub>ind</sub>), (U<sub>crit</sub>), (U<sub>burst</sub>), and endurance. Male fish generally attained higher (U<sub>ind</sub>), (U<sub>crit</sub>), (U<sub>burst</sub>), and endurance than female fish. Naked carp in saltwater demonstrated a higher level of (<i>U</i><sub>ind</sub>), (U<sub>crit</sub>), and (U<sub>burst</sub>) than freshwater. The velocity limit of the pool-and-weir fishway should be lower than the fastest flow speed fish can swim against over a specific distance. The endurance model can estimate the maximum swimming distance at various flow velocity barriers. Observed results can guide design and operation criteria of pool-and-weir fishways for native naked carp.</p>

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Swimming performance of a threatened native fish (Gymnocypris przewalskii) informs fishway design in Qinghai Lake

  • 期刊论文

  • 发表日期：

    2025年3月10日

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  • Senfan Ke,
  • Sen Yang,
  • Zhiying Tu,
  • Shan-e-hyder Soomro,
  • Huaiyao Ji,
  • Dongqing Li,
  • Jiawei Xu,
  • Hongfang Qi,
  • Xiaotao Shi

摘要

The endangered anadromous naked carp Gymnocypris przewalskii is a rare fish species found in Qinghai Lake, China. Studying the swimming abilities of naked carp is crucial for enhancing the design of passageways for these unique fish. Two regression models were employed to assess the influence of salinity, water temperature, body size, and gender on induced flow velocity (Uind), critical swimming speed (Ucrit), burst swimming speed (Uburst), and endurance in naked carp. The findings pointed toward the fact that larger fish under-performed smaller fish for (Uind), (Ucrit), (Uburst), and endurance. Male fish generally attained higher (Uind), (Ucrit), (Uburst), and endurance than female fish. Naked carp in saltwater demonstrated a higher level of (Uind), (Ucrit), and (Uburst) than freshwater. The velocity limit of the pool-and-weir fishway should be lower than the fastest flow speed fish can swim against over a specific distance. The endurance model can estimate the maximum swimming distance at various flow velocity barriers. Observed results can guide design and operation criteria of pool-and-weir fishways for native naked carp.