Efeito da cor e da presença de refúgio artificial sobre o desenvolvimento e sobrevivência de alevinos de Oreochromis niloticus (Linnaeus, 1758)

Effect of colour and presence of artificial haven on the development and survival of Oreochromis niloticus (Linnaeus, 1758) fry. The development and survival of sexually-reverted Nile tilapias (Oreochromis niloticus) fry, bred in artificial havens of different colors, are provided. Research was carried out during 28 days, with 240 fry of the Nile tilapia, initial average weight 0.51 ± 0.11g. Animals were distributed in 24 50Laquariums, in a randomized experimental design in six treatments (haven-less and havens in white, blue, brown, red and green) and four replications. At the end of the experimental period, variable total biomass, condition factor, lot uniformity and survival were analyzed. Weight and length uniformity and factor of condition were affected by the colors of the treatments. Blue treatment had the best uniformity. Factor of condition was best in treatments with brown, red, blue and white havens. Actually they differed significantly from control and green treatments. It may be concluded that presence and coloration of haven partially affected the development of Nile tilapias.