[Objective] This study aimed to examine the effect of different proportions of wolffia on the growth of Procambarus clarkia in 2 kinds of community scales. [Method] Six proportions of baits mixed by watermeal and commercial feed (0, 20% , 40% , 60% , 80% , and 100% ) were designed to feed the Procambarus clarkia juveniles in 2 community scales to research the growth situation of the crayfish in different mixed baits. The growth differences between the minimal community and the larger community of crayfish in the same proportion of wolffia were compared. [Result] The growth situations of crayfish in the 2 community scales at different proportions of watermeal were as follows: the body length was the longest in 60% walermeal group, and the shortest in the pure watermeal group; the regularity was the best in the 20% watermeal group; no matter the minimal community or the larger community, there was no significant difference in the survival rate between different watermeal proportions. The growth situations of crayfish in the 1 community scales at specific proportion of watermeal were: the average body length of the minimal community was significantly greater than the larger community, and the survival rate was also greater than the latter one, but the difference was not significant. [Conclusion] Considering all kinds of index such as growth, survival rate, regularity, the appropriate proportion of the baits mixed by watermeal and commercial feed is 40% to 60% ; big community scale has significant inhibition on growth of crayfish, thus, there should be barriers when cultivating Procambarus clarkia juvenile.%[目的]研究不同比例的芜萍饵料组分对2种社群规模下螯虾生长的影响.[方法]试验设置了芜萍与商品饲料6种比例的混合饵料(0、20％、40％、60％、80％、100％)分别饲喂最小社群与较大社群下的克氏原螯虾幼体,以研究不同芜萍组分下螯虾的生长状况,并对相同芜萍组分下最小社群和较大社群螯虾的生长差异.[结果]2种社群规模的不同芜萍组分螯虾生长结果为:体长最大的均为60％芜萍组,最小的均为纯芜萍组；整齐性最好的均为20％芜萍组；无论是最小社群还是较大社群,各自不同芜萍组分的存活率差异均不显著.相同芜萍组分下2个社群间的同期比较结果为:最小社群的平均体长显著大于较大社群,而存活率前者也大于后者,但差异并未达到显著水平.[结论]综合生长、存活及整齐等指标,认为芜萍与商品饲料合适的混合比例为40％～60％；社群规模较大对鳌虾生长有显著抑制作用,因此应在克氏原螯虾苗种培养环境中设置隔离障碍.
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