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Objetivou-se avaliar a seleção alimentar de organismos-alimento por formas jovens de pacu (Piaractus mesopotamicus) e curimba (Prochilodus lineatus) com diferentes idades (6, 12, 19 e 26 dias), na presença e ausência de Pistia stratiotes. Foram utilizados quatro tratamentos (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba) e quatro repetições. A cada sete dias, foram coletadas 24 larvas de cada espécie de peixe dos tanques, sendo estas mantidas em jejum por 24 horas. Depois de distribuídas nos aquários com plâncton, as larvas permaneceram por três horas, sendo coletadas e fixadas para análise, juntamente com as amostras de água. Os tratos digestórios das larvas foram retirados e analisados sob microscópio óptico. Observaram-se diferenças estatísticas na seletividade alimentar de organismos planctônicos por larvas de mesma espécie, em diferentes idades e também entre larvas de espécies diferentes, com mesma idade, não diferindo quanto à presença ou ausência de P. stratiotes. As formas jovens de pacu e curimba selecionaram organismos similares aos seis dias de idade, passando por alterações até o 26º dia. À medida que se desenvolveram, as larvas de pacu passaram a selecionar cladóceros e ostrácodos e as de curimba, protozoários e algas. The objective was to evaluate the feeding selection of food organisms for two species of fish larvae (pacu and curimba) at different ages (6, 12, 19 and 26 days after eclosion), in the presence or absence of Pistia stratiotes. Four treatments were used (T1 = pacu + P. stratiotes; T2 = pacu; T3 = curimba + P. stratiotes; T4 = curimba) and four replications. Every seven days, 24 fish larvae of each species were collected, and kept without food for 24 hours. After being distributed in the aquariums with plankton, the larvae stayed for three hours, and were collected and prepared for analysis, along with the water samples. The digestive tract of the fish larvae were removed and analyzed under an optic microscope. Statistic differences in selective feeding of plankton organisms were reported for larvae of the same species, of different age groups and also among larvae of different species of the same age. There were no observed differences as for the presence or absence of P. stratiotes. The fish larvae of pacu and curimba selected similar organisms at six days old, with changes until the 26th day. As they developed, the pacu larvae began to select cladocerans and ostracods, and the curimba selected protozoans and algae

acta scientiarum. biological sciences

Seletividade alimentar de organismos-alimento por formas jovens de pacu &lt;em&gt;Piaractus mesopotamicus&lt;/em&gt; (Holmberg, 1887) e curimba &lt;em&gt;Prochilodus lineatus&lt;/em&gt; (Valenciennes, 1836)