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.Objetivou-se avaliar a resposta de piavas a utilização de óleos vegetais nas dietas, sob o desempenho, deposição nutricional e atividade de enzimas digestivas. Durante 35 dias foram testadas cinco dietas, com a inclusão de 3% dos óleos de milho, soja, canola, linhaça e um tratamento controle sem inclusão de óleo. Peixes com peso inicial médio de 1,78±0,07 gforam distribuídos ao acaso em um sistema de recirculação de água composto por 15 tanques. Ao final do experimento realizou-se biometria para coleta de dados. O delineamento experimental foi inteiramente casualizado, com cinco tratamentos e três repetições, os dados obtidos foram submetidos a teste de normalidade e análise de variância. As médias obtidas, quando significativas, foram comparadas pelo teste de Tukey (P<0,05). Os peixes alimentados com dietas contendo óleo de canola apresentaram maior peso e comprimento total e deposição de proteína, quando comparados ao tratamento controle. Maior atividade de quimotripsina foi observada nos peixes alimentados com a dieta contendo óleo de soja.  Conclui-se que o uso de óleos na dieta é indispensável para melhor desempenho dos peixes, sendo o óleo de canola o mais indicado por otimizar a  deposição de proteína corporal pelos animais

Earthworm meal in jundiá juveniles diets

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 jundiá 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 jundiá juveniles diets, without compromising fish growth

Evaluation of propolis as growth promoter for the common carp (cyprinus carpio)

El objetivo de este estudio fue evaluar el uso de propóleo como promotor de crecimiento para la carpa común (Cyprinus carpio). Fue realizado un experimento, con 45 días de duración, donde 375 carpas (peso medio inicial de 4,7g ± 0,7) fueron sometidas a dietas con cinco niveles de propóleo 0,1; 0,2; 0,3; 0,4% y un tratamiento control (sin la adición). Después del periodo experimental se evaluaron los parámetros: peso promedio, longitud total y longitud patrón, tasa de crecimiento específica, factor de condición, y ganancia en peso relativo. El diseño experimental utilizado fue completamente aleatorizado, con cinco tratamientos y tres repeticiones. Los datos obtenidos fueron sometidos a análisis de varianza (P<0,05). Los análisis estadísticos mostraron que, no hubo en ninguna de las variables analizadas diferencias entre el tratamiento control y los niveles de propóleo adicionados en la dieta (P>0,05). No hubo correlaciones significativas entre algunos parámetros zootécnicos evaluados (P<0,05). La adicción del extracto etanólico de propóleo no se mostró eficiente como aditivo para el crecimiento de la carpa comú[email protected] aim of this study was to evaluate the use of propolis as a growth promoter for the common carp (Cyprinus carpio). It was carried a feeding trial, during 45-days, where 375 carp (initial mean weight = 4.7 ± 0.7g) were submitted to diets containing four propolis levels 0.1, 0.2, 0.3 and 0.4% and a treatment control (without the addition of propolis). After the trial period, the parameters were evaluated: weight, total and standard length, specific growth rate, condition factor, and relative weight gain. The experimental design was completely randomized with five treatments and three replications. The data were subjected to analysis of variance (P<0.05). The statistical analysis not showed differences between treatments and control levels of propolis added to the diet, for all analyzed variables (P>0.05). It was observed significative correlations between some parameters evaluated (P<0.05). The etanolic propolis extract is not efficient as growth promoter for common carp