02190naa a2200289 a 450000100080000000500110000800800410001910000170006024501380007726000090021550001420022452012140036665000090158065000110158965000120160065000130161265000130162565000100163865300240164870000250167270000210169770000260171870000170174470000270176170000210178877300910180920944712019-02-25       2018    bl uuuu     u00u1 u    #d1 aRAMOS, S. E.  aCannibalism, growth performance, and body composition of giant trahira juveniles under different photoperiods.h[electronic resource]  c2018  aTítulo em português: Canibalismo, desempenho de crescimento e composição corporal de juvenis de trairão em diferentes fotoperíodos.  aThe objective of this work was to determine the effect of photoperiod on the cannibalism, growth, and body composition of giant trahira (Hoplias intermedius) juveniles. A completely randomized design was employed, with four photoperiods ? 0L:24D, 6L:18D, 12L:12D, and 18L:6D, hours of light (L): dark (D) ? and four replicates, for a period of 90 days. The analyzed parameters were: cannibalism, growth in weight and length, food consumption, feed conversion, protein efficiency rate, muscle growth, and body composition (moisture, lipid, ash, and crude protein). Fish from the 12L:12D photoperiod showed the highest survival rate and no cannibalism, as well as a great uniformity for length and mass values at the end of the experiment. The best photoperiod for giant trahira juveniles is 12L:12D, as these fish showed growth uniformity and no cannibalism, while fish from the 6L:18D and 18L:6D groups had a greater diameter of white muscle fibers and a higher frequency of greater diameter fibers. Giant trahira showed the lowest value for lipids at 6L:18D and the highest value at 12L:12D. Photoperiod affects survival and cannibalism; regarding body composition, only lipids are influenced by photoperiod.  aFish  aLipids  aMuscles  aLipídio  aMúsculo  aPeixe  aHoplias intermedius1 aCARVALHO A. F. S. de1 aCASTRO, T. F. D.1 aVASCONCELOS, A. C. N.1 aVERAS, G. C.1 aMOURÃO JÚNIOR, C. A.1 aMURGAS, L. D. S.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 53, n. 6, p. 664-672, June, 2018.