This work evaluated the inclusion of mesquite bean bran (Prosopis juliflora) and cassava leaf bran (Manihot esculenta) in diets for Nile tilapia (85.22 ± 3.13 g). Three hundred and thirty-six fish were distributed in 28 fiberglass tanks (120 L) in a 2 × 4 factorial scheme for two sources of oil and four levels of bran (0, 5, 10 and 20%) (n = 4). After 60 days, growth performance (feed intake, weight gain, apparent feed conversion and survival rate) and fish body composition were evaluated. Heights and density of villi were measured for morphometric analysis of the intestinal mucosa. Animal performance, body composition and villi density were not affected (p > 0.05) by the source and level of inclusion of bran. There was a significant effect of the level of inclusion of bran on villi height, with a linear trend, indicating that the higher the inclusion levels of bran, the lower the height of the villi. The bran studied can be used in diets for Nile tilapia up to 20% without compromising growth performance and body composition change, but the presence of these by-products can result in a deleterious effect on fish villi.

-This study was conducted to evaluate performance and body composition of tilapia (Oreochromis niloticus) fed diets containing byproducts aerial parts of cassava meal (Manihot esculenta), mesquite pod meal (Prosopis juliflora), cocoa meal (Theobroma cacao) and palm kernel cake (Elaeis guineensis) and to analyze the economic viability of the feed. A total of 1,350 juvenile males (100 g) were distributed in 15 cages (1 m 3 ) in completely randomized design with five treatments (basal diet and four test diets) and three replicates. The following aspects were evaluated: final weight, total feed intake, total weight gain, feed conversion, specific growth rate, protein efficiency ratio and survival rate, dry matter, crude protein, fat and ash body, the average cost of feed per kilogram of weight gain and economic efficiency rate.No differences were observed for total consumption of food or survival rate. For other variables, the inclusion of cocoa and cassava meal impaired fish performance. No differences were observed for dry matter, crude protein and body ash. The lower body fat accumulation was recorded for the tilapia fed palm kernel cake. The best economic indicators were found to diets containing palm kernel cake. The byproducts evaluated can be used up to 150 g/kg in feed formulation, providing good performance and economic rate for Nile tilapia.

The objective of the present study was to evaluate the apparent digestibility coefficients of dry matter (DM), crude protein (CP) and gross energy (GE) of the following agro-industrial byproducts: cassava leaf (Manihot esculenta), mesquite bean (Prosopis juliflora), cotton (Gossypium species), cocoa (Theobroma cacao), soursop (Annona squamata) and African oil palm cake (Elaeis guineensis) for Nile tilapia (Oreochromis niloticus). Fish from two weight classes (200±11 and 300±32 g) were stocked in tanks and fed a reference diet plus 30% of one tested byproduct with the addition of 0.1% chromic oxide. The fish were routinely moved to digestibility aquariums for feces collection, in a completely randomized design (n=3). The apparent digestibility coefficient (ADC) values between the two weight classes were similar, but differed between the byproducts for DM, CP and GE. The highest ADC DM, ADC CP and ADC GE for 200-g and 300-g tilapias were, respectively, 0.58 and 0.53; 0.77 and 0.78; 0.66 and 0.62 for the soursop bran and 0.52 and 0.51; 0.77 and 0.80; 0.66 and 0.60 for the palm cake, respectively. The cotton and cocoa bran had the worst results of ADC of DM in two weight ranges (means of 0.34 and 0.37 g/100 g, respectively) while the mesquite bean had the lowest ADC of CP and GE, with means of 0.28 and 0.14 g/100 g for 200-g and 300-g tilapias, respectively. The byproducts analyzed may be used in formulating diets for Nile tilapia adults, observing their contributions to the digestibility of nutrients and energy for the species

ResumoEste estudo teve como objetivo avaliar a capacidade da ostra Crassostrea rhizophorae como filtro biológico para o tratamento de efluentes da carcinicultura e verificar a sua condição microbiológica após processo de filtração. Um total de 1080 ostras foram distribuídas em lanternas de engorda, mantidas em 12 tanques de fibra de vidro (170 L), em um delineamento inteiramente casualizado, com quatro tratamentos (sem ostras, 60, 120 e 180 ostras) e três repetições. O efluente utilizado foi proveniente do tanque de sedimentação de uma fazenda de produção de camarão. Semanalmente foram analisados: amônio (N-NH 4 + ), ortofosfato (P-PO 4 3-), total de sólidos suspensos (TSS) e clorofila-a (Cl-a) do efluente de entrada e saída. Os tratamentos com ostras apresentaram remoção semelhante (P>0,05) nos teores de Cl-a e TSS do efluente, sendo superiores (P<0,05) ao tratamento sem ostras. Não foi observada melhoria na qualidade do efluente após a passagem pelos tanques experimentais em relação ao N-NH 4 + . Em relação ao P-PO 4 3-, todos os tratamentos reduziram as concentrações desse nutriente de forma semelhante (P>0,05). Não foram observadas diferenças (P>0,05) para os valores de coliformes totais e de cobre, independentemente da densidade de estocagem. Nas amostras analisadas não foram encontrados coliformes fecais e Salmonella spp. As ostras melhoram a qualidade da água, exceto N-NH 4 + , e não apresentam contaminantes que inviabilizem seu consumo. Palavras-chave: Aquicultura integrada, Litopenaeus vannamei, microbiologia AbstractThis study aimed to evaluate the biofiltration capacity of oyster Crassostrea rhizophorae on effluents of shrimp and check their microbiological condition after filtering process. 1.080 oysters were distributed in lanterns kept 12 fiberglass tanks (170 L) in a completely randomized design with four treatments (without oysters, 60, 120 and 180 oysters) and three repetitions. It was used the effluent from the sedimentation tank. Weekly were analyzed: ammonia nitrogen (N-NH 4 + ), orthophosphate (P-PO 4 3-), total suspended solids (TSS) and chlorophyll-a (Cl-a) of the input and output effluent. The treatments