Dariane Beatriz Schoffen Enke

Suplementação de fitase microbiana na dieta de alevinos de jundiá: efeito sobre o desempenho produtivo e as características de carcaça

Este estudo foi realizado para avaliar os efeitos da adicao de diferentes niveis de fitase na dieta sobre o desempenho produtivo e as caracteristicas de carcaca de alevinos de jundia (Rhamdia quelen). Foram utilizados 208 alevinos com peso vivo inicial medio de 2,92±0,59g, distribuidos em um delineamento inteiramente casualizado com quatro tratamentos (0, 500, 1.000 e 1.500FTU kg-1) e quatro repeticoes. Na composicao das dietas, foram utilizados somente ingredientes de origem vegetal e o alimento foi fornecido duas vezes ao dia. A cada quinzena, foram avaliados os parâmetros produtivos e, ao termino do periodo experimental (45 dias), foram ainda realizadas avaliacoes nas carcacas. O ganho de peso medio foi significativamente crescente (P<0,05) entre os tratamentos sem adicao de fitase (0 FTU kg-1) e o nivel maximo utilizado (1500FTU kg-1) na dieta, variando de 1,24±0,27g para 1,73±0,23g, respectivamente. A taxa de crescimento especifico tambem teve efeito significativo (P<0,05) nos tratamentos sem fitase e 1.500FTUkg-1, passando de 0,78±0,12% para 1,07±0,11%. Entretanto, o extrato etereo na carcaca foi linearmente decrescente com os niveis de fitase na dieta em todos os tratamentos (P<0,05), reduzindo de 13,54±0,02% (sem fitase) para 10,59±0,10% (1.500FTU kg-1). A inclusao de niveis crescentes de fitase na dieta, ate 1.500FTU kg-1, melhora o desempenho e as caracteristicas de carcaca de alevinos de jundia.

Utilização de farinha de silagem de pescado em dietas para o jundiá na fase juvenil

This study evaluated the productive performance and carcass yield of jundia (Rhamdia quelen) fed with different fish dregs chemical silage flour concentrations in substitution to the sugar cane yeast in a diet based on vegetable ingredients (control diet). Animals with initial weight of 48.11±5.54g were distributed in 5 treatments with 3 replicates, in a completely randomized design. Each observation unit consisted of a 1,000 liter polipropilene tank, with 200 liters of water, with 9 animals, in a thermo-regulated system with water recirculation. During 75 days, twice daily (9h and 17h) the following diets were offered, in the proportion of 7% total biomass: 0% (control), 12.5%, 25%, 37.5% and 50% of silage flour. Results showed a quadratic effect (P<0.05) for inclusion levels of fish silage flour on final weight, weight gain, total length and specific growth rate. The inclusion of 30-35% of fish dregs chemical silage flour in the diet, results in better production performance of jundia juveniles without affecting the survival and the water quality.

Use of adsorbent in diets containing aflatoxin for silver catfish fingerlings

The effects of aflatoxins and one adsorbent (Sodium and calcium aluminum silicate) on silver catfish (Rhamdia quelen) fingerlings were evaluated in this study. Three hundred and sixty fish, with initial weight of 4 g, were raised in a thermo-regulated recirculation water system, during 90 days. Twelve treatments with four aflatoxin levels in diet (0, 150, 250 and 350 µg/kg), with and without adsorbents (0, 0.3 and 0.6%) were tested in three replications. The results showed that the negative effect of aflatoxins significantly reduced the growth and weight gain of fingerlings, proportionately to the increasing levels of aflatoxin in diet, with mortality occurrence. The adsorbent levels in diet did not diminish the effects of aflatoxin action on fish performance due to the low inclusion and also little acceptance of ration in relation to the product palatability. It is concluded that silver catfish fingerlings fed diets containing aflatoxin are susceptible to negative effects, with high losses in growth and weight gain.

Desempenho de alevinos de jundiá alimentados com silagem de rejeito de peixe

The objective of this work was to evaluate the growth performance of catfish fingerlings fed silage from fish waste, replacing soybean meal and sugar cane yeast. During 35 days, 375 silver catfish fingerlings with 1.73±0.17 g initial weight, distributed in a completely randomized design, were evaluated in five treatments and four replicates. The treatments consisted of fish silage inclusion at 0, 12.5, 25, 37.5, and 50%. All the evaluated parameters, except the condition factor, showed that the replacing of soybean meal and yeast for fish waste silage improves the yield performance of silver catfish fingerlings.