The Australian crayfish (Cherax quadricarinatus) has become increasingly common in the aquaculture industry due to its larger size and tolerance of environmental conditions such as temperature, hypoxia, and water quality. There is a high risk of the species being introduced into the wild, as aquaculture ponds are commonly in association with natural streams and ponds. Likewise, public use, and disposal, of crustaceans is known to not be tightly controlled which could lead to competitive interactions with other widespread native species. Therefore, we are interested in examining the behavioral nature of C. quadricarinatus in the intraspecies pairing as well as interspecies pairing with a well-established model of an aggressive native crayfish (P. clarkii). To accomplish this, crayfish were isolated for 2 weeks and then paired for 20 min with video monitoring. Similar sized C. quadricarinatus were used for pairing from small (4-5 cm body length) to large (~15 cm). Only large C. quadricarinatus and large P. clarkii were paired. Thus far, small C. quadricarinatus are more aggressive in their intraspecies pairings than either the large C. quadricarinatus or the P. clarkii. The results of this ongoing investigation will establish the social nature of the previously unstudied C. quadricarinatus.