CULTIVATION OF Lophiosilurus alexandri JUVENILE UNDER DIFFERENT LIGHT CONDITIONS

The survival of several species in captivity depends on their adaptation to environmental conditions, it is essential to adapt the parameters as the biological characteristics of the species. The objective of this study was to evaluate the influence of different luminosities on growth performance, plasma cortisol level, behavior and pigmentation of skin in juvenile pacamã, Lophiosilurus alexandri.

The fish were submitted to the following light intensities: 0, 218, 278 and 459 lux. The experiment was conducted for 75 days in recirculation system with temperature control, aeration and controlled photoperiod. The pacamãs were distributed in aquariums with a volume of 35 L, a density of approximately 0.28 individuals of L. To assess the weight is measured-performance, standard length and total weight gain, feed intake, feed conversion, biomass, specific growth rate and survival. Also, was evaluated the swimming behavior, skin pigmentation and plasma cortisol level.

The different luminosities not interfere in growth (Table1), kept low the cortisol levels in plasma (Table 2), and not influence in pigmentation (Table 3). However, it is recommended cultivation in no light environment because it reduces feed intake and improves feed conversion, which are characteristics desirable production.