01237naa a2200241 a 450000100080000000500110000800800410001902400360006010000160009624501170011226000090022950000250023852005370026365000190080065000200081965000180083965000170085765000240087465000130089865000150091165300190092677300500094520860052018-05-02       2018    bl uuuu     u00u1 u    #d7 a10.1590/1809-43922017011812DOI1 aLIMA, A. F.  aThe influence of sex ratio on the reproduction of pirarucu, Arapaima gigas, in captivity.h[electronic resource]  c2018  aShort communication.  aBecause sex ratio in the broodstock can influence the reproductive behaviour of a species, the influence of sex ratio on the reproductive success of pirarucu, Arapaima gigas, in captivity was assessed. Pirarucu breeders were stocked in 0.10-0.13 ha earthen ponds at three sex ratios in quadruplicate: one male to one female (1M1F); one male to two females (1M2F); and two males to one female (2M1F). Eight spawning events occurred, seven of them with the 1M1F sex ratio, which was the most successful of the three tested sex ratios.  aArapaima gigas  aMating behavior  aTropical fish  aAcasalamento  aPeixe de água doce  aPirarucu  aReprodutor  aBreeding pairs  tActa Amazônicagv. 48, n. 1, p. 38-41, 2018.