Experiment on the influence of water temperature on the migration behavior of grass carp in vertical slot fishway
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Abstract:
Fish passing experiments were conducted in a fishway model to figure out the influence of water temperature on the fish migration behaviors. A hydraulic model with a scale of 1：4 was established based on the gravity similarity criterion, and the juvenile grass car p was selected as the test fish. Camer as were used to monitor the migration process of the test fish, and the fish passage rate and passage time were counted and analyzed quantitatively. The experimental results showed that : the total passing rate of juvenile grass carp was more than 70% in the water temperature range of 18.5~ 22.5 e , and there was no significant change in passing rate in differ ent water temperature ranges, the influence of water temperature on the fish passage rate is not obvious; the SPSS so ftware used to test the significance which showed that the passing time of juvenile grass carp had no significant correlation with water temperature. Based on the above results, the influence of water temperature can be neglected in the future research of the grass carp migration behavior test in the range of 18.5~ 22.5 e .
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