The current work aimed to evaluate the ideal diet level for yellow tail lambari (Astyanax bimaculatus) fingerlings on body weight percentage. Two hundred and forty fingerlings averaging initial weight of 0.52 ± 0.05 g were allotted to 24 hapas according to a completely randomized blocks with six treatments and four replicates. A 1000 L-tank with 6 hapas was considered the block. A hapa with 10 fingerlings was considered the experimental unit. The treatments consisted of increasing feeding levels: 1, 4, […]

The feeding is one of the most important factors to larval development and the sucess of the commercial cultivation of decapod crustacean larvae depends on the efficient and economic utilization of the available food. The performance of Macrobrachium rosenbergii larva submitted to four different feeding systems was tested by using the daily observation of the larval substages and the first metamorphoses. The larvae were stocked in a density of approximately 100 larvas.l-1, in 16 tanks, with 33 liters capacity. The […]

Two experiments were carried out aiming to compare techniques of digestibility of fish food nutrients, by using external indicators (chromic oxide and barium carbonate), internal indicators (HCl-insoluble ash, acid detergent insoluble ash, crude fiber and acid detergent fiber) and the direct determination technique. Corn meal was used in the first experiment and soybean meal was used in the second one; both used 100 g tambaquis. Chromic oxide and barium carbonate are effective external indicators for estimating the digestibility coefficients of […]

This work was carried out to identify the replacement of the nauplii Artemia sp. for the enriched and frozen rotifer (Brachionus plicatilis O.F. Müller, 1786) on the larval development and survival of the freshwater prawn M. rosenbergii. The experiment was developed according to the following treatments: 100% B. plicatilis (30 rots/ mL) (T1); 100% Artemia sp. (5 nas/ mL) (T2), 60% Artemia sp. (3 nas/ mL) + 40% B. plicatilis (12 rots/ mL) (T3) e 40% Artemia sp. (2 nas/ […]

The snooks Centropomus parallelus are fishes with high commercial value and social and economic importance. They have potencial to be used in aquaculture, as they accept to be confined and to be fed with ration. The knowledge of the nutritional requeriments of the snook is basic to produce especific ration. Centropomus parallelus fed soybean meal, oat meal and rice meal, tested as ration ingredients with 0.5% to chromium oxide (Cr2O3), as a external marker, were used to determine the digestibility […]