Bilateral Symmetry in Crayfish Behavioral Reactions


The crayfish, Procambarus cubensis, placed in the central area of a plus-maze preferred to go forward in about 50% of trials; they chose the right or left arm in 20.7 and 18.9% of the trials, respectively. In a T-maze, the difference between right and left directions was also insignificant. When exploring a plusmaze, the crayfish turned to 180° at the end of the arms, then turned to 90° going to the next arm. The mean difference between the right and left U-turns, and the right and left turns was insignificant though some animals demonstrated a left or right preference. There was a strong correlation between the direction of U-turns and following turns ensuring the clockwise or anti-clockwise movements of the crayfish. Also we examined a possible preference of the right or left claw in the feeding behavior of the crayfish. The crayfish caught a small bloodworm given from above equally with the right or left claw. The crayfish conditioned to take a bloodworm with a claw did not demonstrate any stable preference of left or right claw in the course of the experiments. The question of bilateral asymmetries within the decapod crustaceans is discussed.


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Correspondence to Zhanna Shuranova.

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Shuranova, Z. Bilateral Symmetry in Crayfish Behavioral Reactions. BIOLOGIA FUTURA 59, 163–172 (2008).

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  • Crayfish
  • plus-maze
  • T-maze
  • directional preference
  • claw preference