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Urban farming through aquaponics has begun in Kelurahan Kandri, Semarang since 2016. More than eighty people, both public and private, formed an aquaponics community. This community has conducted routine training on aquaponics to develop urban farming through this system elsewhere in Semarang. In fact, it did not increase significantly, the number of aquaponics was unstable, sometimes increasing or decreasing. Therefore, the purpose of this research was to find out the motives and dynamics of the aquaponics community as aquaponic actors in supporting urban farming. The method of this research used a qualitative approach with purposive sampling. The results of studies with the analysis of the theory of motives and group dynamics show that this community was in the class of altruism and collectivism motivation so that it has a chance of sustainability even though at certain moments it decreases. As for the dynamics of some aquaponic actors who think that they weren-t in line with expectation, factors emerge that weaken the community in aquaponic. However, those who have psychological and social motives will tend to survive because they got personal satisfaction and a good impact on their environment. Therefore, when many aquaponics actors leave this system, they keep trying to return to carry out aquaponic activities in support of sustainability of urban farming in Semarang.