Efeito do fotoperíodo e do alimento vivo na performance de larvas de tambaqui (Colossoma macropomum, Cuvier, 1818)

Abstract

In a fish culture the feeding strategy is important from the nutritional point of view, the artificial diet can play a favorable role in the development of the fish. The studied species, the tambaqui (Colossoma macropomum), presents excellent performance in intensive breeding and, due to climatic reasons, is more cultivated in the Northern Region of Brazil. The present work consisted in verifying the effect of the photoperiod and nauplii of Artemia sp. in the development of tambaqui larvae. The experiment lasted 15 days where 2400 larvae were distributed in 24 aquariums, with a useful volume of 12L each, where 12 had access to luminosity and 12 remained in the dark. Data analysis showed that there was influence of the photoperiod 12:10 (light: dark) (p <0.05) on the factors of weight gain and length. The larvae of the experiment with photoperiod of 12:12 (dark: dark), showed growth and weight gain, similar result was found in the experiment with luminosity. The use of the inert food offered in the first stages of life was not adequate for the larvae in both experiments. The luminosity showed influence, producing a positive effect on the growth of the larvae. Náuplios of Artemia sp. can be offered as a good alternative source of food or feed supplement in any period, light or dark.