The objective of this work was to evaluate (under field conditions), the performance of bullfrog tadpoles (Rana catesbeiana) raised on commercial frog farms using the “Amphifarm” Systems, and, at the same time, to estimate daily food intake, in order to obtain a reference table for feeding the animals. The results found on the observation units (approximately 249 mil animals) showed the following indexes: mortality(%): range from 0.7 to 35.2, the average being 5.9; weight gain (g/day) varied from 0.03 to […]

This work aimed to evaluate different crude fiber levels on reverted Nile tilapia (Oreochromis niloticus, L) fingerlings performance and time of retention of food. One hundred and twenty-five fingerlings of Thai strain, 1.39 ± 0.03 g of initial weight were allotted to twenty-five 54 L aquarium, at five treatments and five replications on completely randomized design. Five isoenergy (3000 kcal/kg of digestible energy) and isoprotein (30% of crude protein) diets were formulated with five different crude fiber levels (3.65, 4.75, […]

The objective of this study was to reduce the level of the biological marker Cr2O3 in animal diets, due to the sensibility of the sdiphenylcarbazide spectrophotometric method for chromium determination in feces, recently developed. Six levels of marker, chromium (III) oxide (0.01% – 0.02% – 0.03% – 0.05% – 0.1% and 0.2%), were incorporated into isoproteic and isoenergetic diets, for the apparent digestibility assay of the “piauçu” (Leporinus macrocephalus), in a design of entirely randomized groups. Feces were collected during […]

This work was carried out at Aquicultura Laboratory of Maringá State University, to evaluate the different processing form of diets on Nile tilapia fry performance and survive, during sexual revert phase. Was utilized 540 fry distributed, on completely randomized design with three treatments and six replications, in eighteen 54 L aquarium and one aquarium with 30 Nile tilapia fry was considered an experimental unit. The experimental period was 28 days with average temperatures of 21.9 ± 0.1ºC in the morning […]

Eight Podocnemis expansa commercial flocks, all of them located at the county of Diorama State of Goiás, were monitored with the purpose of evaluating, the carcass yield parameters and chemical composition. The experiment was conducted upon animals with ages ranging from 23 to 29 months, whose performances were evaluated by taking their biometrical measures – the carapace rectilinear length in millimeters and the gain of weight in grams. It was also evaluated the carcass output and chemical composition. The comparison […]

The present study evaluated the effects of alternating food restriction and refeeding cycles on the growth of pacu, during the growout phase and the viability of this practice in the commercial production of the species. Juvenile fish were distributed in 3 tanks and submitted to different feeding strategies: group A (fed ad libitum daily), B (food restricted to 4 weeks and refed for 9 weeks) and C (food restricted to 6 weeks and refed for 7 weeks) totalizing 13 weeks […]

It is necessary to carry out a study that focuses on the morphometrical parameters of the gastrointestinal tract (TGI), which can provide subsidies for getting knowledge about the digestive processes that happen into the animal organism. Bimontly, it was sampled 100 P. expansa hatchlings, which were randomly captured from eight commercial flocks located at the county of Diorama, State of Goiás/Brazil. The experiment was conducted with animals of 23 to 29 months of ages, from which the biometrical measures were […]

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 […]

The effects of different levels of vitamin C and iron on growth performance and physiological parameters on Nile tilapia (Oreochromis niloticus) were evaluated for 73 days. A factorial experiment with three levels of vitamin C (125; 375 e 1115 mg/kg) and three levels of iron (30, 90 e 270 mg/kg), plus an additional treatment (with 0 mg/kg of vitamin C and iron), was considered on a completely randomized design, with four replicates for each experimental group. It was randomly stocked […]

In room acclimatized in Experimental Frog-Farm of Fundação Universidade Federal of Rio Grande (REURG) four flies cages were prepared, being put in each one about 5000 pupas of Musca domestica. After the birth of the flies, each flie cage received, above the trays with food (sugar and milk), a tray with substratum for posture, constituted of humidified wheat flour. Daily the substratum for posture were homogenized and distributed among 15 small trays, conditioned in acclimatized stoves and submitted to a […]