Skip to Main Content
Table 3.

Ethogram of crayfish behaviors used to determine winners. Numbers in parentheses indicate whether the behavior was an attack or retreat (+/−) and the weight of the behavior (1/2). Each tally mark in the behavior table is multiplied by the number in parentheses corresponding to that behavior and then totaled.

Crayfish Agonistic Behavior Name & WeightBehavior Description
Approach (+2) Crayfish walks toward the other crayfish, generally with claws extended (perhaps posturing). Speed is greater than average walking speed. Ends when movement ceases or direction changes. 
Posturing (+1) Crayfish raises claws and front part of body but does not approach other crayfish. Generally, claws are very open during this behavior.
Ends when crayfish lowers claws below plane of body, or when crayfish moves toward the other crayfish. 
Retreat (−1) Crayfish turns and walks away from other crayfish or postures and walks backwards; if the former, walking will be faster than average walking speed. Ends when movement ceases or direction changes (generally to approach). 
Tail flip (−2) A very obvious behavior. Rapid flick of telson (tip of tail), which propels the crayfish backward with its claws extended together and down in a streamlined position. Ends when all walking legs make contact with aquarium floor again. 
Crayfish Agonistic Behavior Name & WeightBehavior Description
Approach (+2) Crayfish walks toward the other crayfish, generally with claws extended (perhaps posturing). Speed is greater than average walking speed. Ends when movement ceases or direction changes. 
Posturing (+1) Crayfish raises claws and front part of body but does not approach other crayfish. Generally, claws are very open during this behavior.
Ends when crayfish lowers claws below plane of body, or when crayfish moves toward the other crayfish. 
Retreat (−1) Crayfish turns and walks away from other crayfish or postures and walks backwards; if the former, walking will be faster than average walking speed. Ends when movement ceases or direction changes (generally to approach). 
Tail flip (−2) A very obvious behavior. Rapid flick of telson (tip of tail), which propels the crayfish backward with its claws extended together and down in a streamlined position. Ends when all walking legs make contact with aquarium floor again. 
Close Modal

or Create an Account

Close Modal
Close Modal