In order to quantify the contribution of four Central Amazon floodplain trees, Cassia leiandra Benth., Crescentia amazonica Ducke, Macrolobium acaciifolium (Benth.) Benth. and Vitex cymosa Bert. ex Spreng., as food resource for fishes, ten adult individuals of each species were labeled on Marchantaria Island. The peak of fruit offer occurred during the high water season, between the months of January and May. C. leiandra showed the biggest fruit production with 1,836 kg/ha and greatest economic interest as a food resource for fishes, birds, monkeys and local people. The principal fruit consuming fishes were, tambaqui (Colossoma macropomum), matrinxã (Brycon cephalus), pirapitinga (Piaractus brachypomus), pirarara, (Phractocephalus hemioliopterus), bacu (Lithodoras dorsalis), pacu (Myiossoma sp., Myleus sp., Metynnis sp., Mylesinus sp.) and sardinha (Triportheus elongatus). The tree species show potential as a food resource for fishes.
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