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The knowledge of appropriate reproductive managements is fundamental for the management and orientation of activities in restocking centers. The aim of the present study was to evaluate the influence of artificial and semi-natural reproductive systems and sex ratios on parental contribution progeny of Prochilodus lineatus. Samples of caudal fins from 25 breeders subjected to the artificial reproductive system and 10 breeders subjected to the semi-natural reproductive system were collected in different sex ratios (1♂:1♀ and 2♂:1♀, and 1♂:1♀, respectively). Two hundred and eight fingerlings from these matings were evaluated. Breeding mortality was recorded shortly after reproductive procedures. For paternity analysis, 10 microsatellite loci were amplified. Three breeders died in the artificial reproductive system (two in the 1:1 ratio and one in the 2:1 ratio). In the 1:1 ratio in the artificial reproductive system, one male (M1.4) had a higher contribution in the progeny formation (41.8%), whereas in the 2:1 ratio, four males contributed from 14.5 to 21.7%. Lower reproductive dominance was identified in the semi-natural reproductive system, with values ranging from 22.86 to 25.71% for four males. In the formation of families, both systems demonstrated a reproductive dominance of some couples. So, the semi-natural reproductive system allowed greater homogeneity in the contribution of progeny without losses due to mortality.

Contribuição parental em progênies de Curimba usando diferentes sistemas reprodutivos