Abstract
To analyse the agonistic behaviour of Portunus trituberculatus, infrared cameras were used to quantitatively analyse the aggressive behaviour in response to different sex pairings and culture densities and mirror-image stimulation. The results show that: P. trituberculatus has nine behaviour patterns which were correlated, and the fighting process followed a specific, rather than random, process. All nine behaviour patterns were stimulated in response to different sex pairings and culture densities, but only five patterns were induced by mirror-image stimulation. The fighting intensity between the males was significantly higher than that between the females and male and female (p < 0.05). The fight intensity in the 8 crabs/m2 density group was significantly higher than the 4 crabs/m2 and 6 crabs/m2 groups (p < 0.05). The fighting experience had a significant impact on the subsequent fight. The probability of the winner winning again was 83.3%, whereas that of the loser winning again was only 25.0%. In the second round of fighting, the fight intensity of the loser was also significantly lower than those of the winner (p < 0.05). Thus, the fighting process of P. trituberculatus follows a certain regularity, and different sex pairings and culture densities have a significant impact on fighting intensity. Fighting experience also has a significant impact on subsequent agonistic behaviour, with a winner–loser effect.
Published Version
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