Patrícia Inês Mombach

Farinha de minhoca em dietas para juvenis de jundiá

One of the greatest demands, concerning native fish nutrition, is the evaluation of alternative protein sources that can be used in diets. This study aimed at evaluating the growth rate and body composition of jundia juveniles fed with different levels of earthworm meal. A total of 300 fish, with an average initial weight of 15.6 g ± 5.65 g, were distributed in 15 polypropylene tanks (250 L), for 30 days. A completely randomized design with five treatments (10%, 20%, 30% and 40% of earthworm meal inclusion and a control treatment) and three replications, totaling 20 fish per experimental unit, was used. The fish were fed twice a day, getting 5% of their body weight in feed day -1 . At the end of the experimental period, the final weight, total and standard length, specific growth rate, condition factor and relative weight gain were evaluated. The body composition was also analyzed, being determined the rates of moisture, ashes and body fat and protein, as well as blood glucose. The weight and total and standard length were not influenced by the addition of earthworm meal to the diet. The inclusion levels of earthworm meal affected the fish specific growth rate, relative weight gain and condition factor. The earthworm meal can be added up to 30%, in jundia juveniles diets, without compromising fish growth .

Utilização de óleos vegetais em dietas para juvenis de piava (Leporinus obtusidens)

This study aimed to evaluate the response of piava (Leporinus obtusidens) after the use of vegetable oils in the diet, under performance, nutrient deposition and activity of digestive enzymes. Over 35 days five treatments were tested, with the inclusion of 3% of corn oil, soy, canola, linseed, and a control treatment without the inclusion of oil. Fish with an average initial weight of 1.78±0.07 g were randomly assigned in a water recirculation system consisting of 15 tanks, with suitable water quality parameters throughout the trial period. At the end of biometrics experiment data was collected. The experimental design was completely randomized, with five treatments and three replicates; the data was submitted to normality test and analysis of variance. The averages, when significant, were compared by Tukey test (p<0.05). Fish fed diets containing canola oil showed higher weight and length and protein deposition when compared to the control treatment. Higher chymotrypsin activity was observed in the fish fed the diet containing soya oil and lower with linseed oil. It is concluded that the use of oils in the diet is essential for best performance of the fish, and canola oil as indicated by optimizing the deposition of body protein for animals.