Daniela Ferraz Bacconi Campeche

Vitamin A in diets for Nile tilapia

ABSTRACT: Dietary vitamin supplementation decrease stress caused by high stocking density, andboosts immunological system of farmed fish. A studied was carried out to determine vitamin Arequirements of Nile tilapia ( Oreochromis niloticus ) in an all male group (13.8 ± 1.2 g) and a mixed sexpopulation (9.8 ± 2.3 g). Fish stocked in 100-L plastic aquaria (26.0 ± 1.0oC) were fed to near satiety,twice a day, seven days a week, during 75 days with vitamin A-free, semi-purified diets supplementedwith 0; 600; 1,200; 1,800; 2,400; 3,000; 3,600; 4,200; 4,800 and 5,400 International Units (IU) of retinylpalmitate (30% vitamin A) per kg of diet in a completely randomized experimental design, factorialarrangement 2χ10 (n = 4). Deficiency signs of vitamin A were observed in fish fed 0 to 1.200 IU vitaminA kg –1 diet; moderate signs were observed in fish fed diets with 1.800 to 3.600 IU vitamin A kg –1 diet;no interactions group*level ( p < 0.05) were detected. Dietary levels of vitamin A up to 5.400 IU kg

Composição bromatológica e digestibilidade aparente de alimentos encontrados na região semiárida brasileira para arraçoamento de tilapia rosa em cultivos

This study evaluated the apparent digestibility coefficient of dry matter, crude protein and digestible energy (Kcal kg-1) for six ingredients (cassava chips, sorghum grain, atriplex hay, gliricidia hay, leucaena hay and wine residues) available in Brazilian semi-arid for pink tilapia feed. The feed were stained with 0.1% of chromic oxide III. A total of six circular tanks containing 1000 liters of volume were used. In each one was placed a circular cage of plastic screen with 20 fish each (initial weight of 80g). The fish were hand fed daily 3 times a day. To collect feces each cage was placed in the evening in conical 250L fiberglass tanks. Apparent digestibility of the ingredients tested was calculated based on the content of chromic oxide III in the samples offered and in the feces by atomic absorption spectrophotometry to the nutrient feed and feces, according to standard procedure. Among ingredients evaluated the best CDA values for MS were to cassava chips and sorghum. The best CDA values for CP were to cassava chips, sorghum and gliricidia hay. Atriplex hay was the ingredient with better digestible energy value.

Replacing cornmeal with mango meal in diets for juvenile Tambaqui Colossoma macropomum: growth and metabolic parameters

The effect on tambaqui fingerlings performance caused by diets containing two different carbohydrate sources was evaluated. Four isoproteic diets with different mango meal concentrations (0, 33, 66 and 100%) replacing cornmeal were tested. The feeding trial lasted 45 days and the feeding rate was 8% of total biomass. 240 tambaqui fingerlings with an initial weight average of 3.66g were distributed in 12 500-liter tanks in a recirculating water system with biofilter. Performance, feed intake, carcass yield, survival, total cholesterol, plasmatic free amino acids, hepatic aspartate aminotransferase(AST), hepatic glycogen and plasma glucose values were evaluated. The results showed that weight gain, daily weight gain, specific growth rate, apparent food consumption, cholesterol, AST and glycogen showed higher values in the treatments with the highest levels of mango meal. Apparent feed conversion, carcass yield, survival and plasma glucose were not affected by the two sources of carbohydrates tested. In conclusion, mango meal used in a practical diet for tambaqui improved growth performance.The effect on tambaqui fingerlings performance caused by diets containing two different carbohydrate sources was evaluated. Four isoproteic diets with different mango meal concentrations (0, 33, 66 and 100%) replacing cornmeal were tested. The feeding trial lasted 45 days and the feeding rate was 8% of total biomass. 240 tambaqui fingerlings with an initial weight average of 3.66g were distributed in 12 500-liter tanks in a recirculating water system with biofilter. Performance, feed intake, carcass yield, survival, total cholesterol, plasmatic free amino acids, hepatic aspartate aminotransferase(AST), hepatic glycogen and plasma glucose values were evaluated. The results showed that weight gain, daily weight gain, specific growth rate, apparent food consumption, cholesterol, AST and glycogen showed higher values in the treatments with the highest levels of mango meal. Apparent feed conversion, carcass yield, survival and plasma glucose were not affected by the two sources of carbohydrates tested. In conclusion, mango meal used in a practical diet for tambaqui improved growth performance.