In Manaus (Brazil), native and exotic fruit plant species are commonly planted in the riparian zones of urban streams. However, little is known about the effects of these fruits in these environments, with studies focusing mainly on leaf litter. We assessed the decomposition of hard pericarp (Astrocaryum vulgare and Bactris gasipaes) and soft pericarp (Genipa americana, Mangifera indica, Syzygium cumini and Talisia esculenta) fruits in a second-order Amazonian stream in the Ducke Forest Reserve, Manaus. We performed two experiments to evaluate the amount of fruit remaining biomass of cut fruits. In the experiments, we used litter bags with fine (exclude invertebrates) and coarse mesh. We performed litter bags removal after 4, 15 and, 30 days. Fruit decomposition was similar in fine and coarse mesh litter bags, indicating the main role of microorganisms in fruit decomposition. In Astrocaryum vulgare the mean remaining dry biomass was 70.0% of the initial biomass. In contrast, for Mangifera indica the mean remaining dry biomass was 2.0% of the initial biomass. In summary, the remaining biomass in tough fruits was 2 times higher than in soft fruits. More studies are still necessary to understand the importance of fruit decomposition in stream food webs in Amazonian streams where the diversity of riparian fruit-producing species is high in both urban and natural riparian forests.