Study on the swimming ability of endemic fish in the lower reaches of the Yangtze River: A case study

摘要

The swimming abilities of Spinibarbus hollandi , Siniperca chuatsi , Siniperca loona , Odontobutis sinensis and Rhinogobius giurinus were tested in this study, including induced swimming speed (Usubind/sub), critical swimming speed (Usubcrit/sub) and constant acceleration test speed (UsubCAT/sub). The results showed that the Usubind/sub of the experimental fish in the Huishui River ranged from 5 to 30?cm/s. The average Usubcrit/sub of fish was 68.2?cm/s and 5 times the average Usubind/sub. The average UsubCAT/sub was 97.6?cm/s and 7 times the Usubind/sub. The swimming speed of fish is related to their body size. The results showed that the swimming speed was more correlated with the shape than the body length of fish. The relationships between the three speeds and the shape of the experimental fish were U ind = 9.809 S 0.128 U crit = 37.954 S 0.185 , and U CAT = 58.418 S 0.099 . The differences in Usubind/sub between the five fishes were not obvious, while there were significant differences in Usubcrit/sub and UsubCAT/sub between the five fish species. The results of this study suggested that Spinibarbus hollandi , Siniperca chuatsi , and Siniperca loona have stronger swimming abilities than Odontobutis sinensis and Rhinogobius giurinus .