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| Fighting Behavior of Red Swamp Crayfish in Different Culture Conditions |
| XU Yunling, PU Xueyin, XU Zhongqi, HUANG Cheng, HUANG Yahong |
| College of Life Sciences, Nanjing University, Nanjing 210023, China |
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Abstract In order to explore the fighting behavior of red swamp crayfish Procambarus clarkii under different culture conditions and enrich the behavioral research content of red swamp crayfish, two trails were designed in this study. In the first stage, 50 red swamp crayfish in the isolation group were put into the non isolation group domestication boxes (single-group), and 50 red swamp crayfish in the non isolation group were put into other domestication boxes (group-group). After 24 hours, the survival number of red swamp crayfish in each box was recorded. In the second stage, the same-sex red swamp crayfish in the isolation group and the non isolation group, whose body weight and body length were close to each other, were paired in two groups (the non isolation group was not paired with the original partner) to form 36 pairs of fighting groups, recorded the fight with the camera. The time of the first fight between red swamp crayfish (the length of hesitation period), the time of each fight, the total fighting time and the number of fighting rounds were recorded. The ratio of the total fighting time to the number of fighting rounds, i.e. the average fighting time, was taken as the standard to measure the fighting strength. The results of the first phase of the experiment showed that the single-group mortality was significantly higher than that in the group-group (P<0.05). The results of the second experiment showed that the fighting rate, the number of fighting rounds, the total fighting time and the fighting intensity of the red swamp crayfish kept in isolation were significantly greater than those in the non-isolated state (P<0.05). However, after eliminating the no fighting samples, there was no significant difference in the fighting behavior parameters of red swamp crayfish in the two feeding conditions (P>0.05). The results revealed that red swamp crayfish raised in an isolated environment were more aggressive, but isolation did not enhance the fighting capacity of red swamp crayfish. When a red swamp crayfish entered an unfamiliar environment from an isolated environment, death was more likely to occur (invaders died, or native died, or both died).
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Received: 11 November 2019
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