Embora a ciência da nutrição de peixes esteja longe estabelecer um padrão geral exigências nutricionais, necessidade desenvolvimento alimentos baixo impacto poluente há muito faz parte agenda das comunidades científica e empresarial internacional aqüicultura. Não só é absolutamente possível formular ambientalmente corretos, como necessário modelar formulação destes alimentos. Porém, necessária absoluta acurácia para atender formulações espécie-específicas, considerando-se as interações...

Abstract Impaired immune system by environmental stressors can lead fishes to be more susceptible diseases that limit the economic development of aquaculture systems. This study was set out determine effect six levels mannan oligosaccharides (MOS; ActiveMOS ® ; Biorigin, Lençois Paulista, São Paulo , Brazil) on performance index and hematology Nile tilapia, Oreochromis niloticus juveniles. Fish (13.62 g) were randomly distributed into 18 plastic aquaria (300 L; 20 per aquarium) fed during 45...

Improper dietary protein and energy levels their ratio will lead to increased fish production cost. This work evaluated effects of : on growth body composition pacu, Piaractus mesopotamicus. Fingerling pacu (15.5 ± 0.4 g) were fed twice a day for 10 weeks until apparent satiation with diets containing 220, 260, 300, 340 or 380 g kg−1 crude (CP) 10.9, 11.7, 12.6, 13.4 14.2 MJ digestible (DE) in totally randomized experimental design, 5 × factorial scheme (n = 3). Weight gain, specific rate...

This research assessed four levels of crude protein—200, 250, 300 and 350 g/kg—associated with two lipid concentrations—110 140 g/kg—in diets for juveniles tambatinga (♀Colossoma macropomum × ♂Piaractus brachypomus) over 63 days. The fish (15.2 ± 0.2 g) were distributed in 24–160 L tanks (11 fish/tank) a 4 2 completely randomized factorial design (n = 3). Increasing the content reduced (p < 0.05) protein requirements weight gain from 326 g/kg (diets 110 LIP) to 255 g/kg). Protein retention...

Organic acids have recently been identified as promising replacements for antibiotics in aquafeeds that promote fish growth and feed efficiency. This study evaluated the inclusion of fumaric acid (FA; 0, 5, 10, 15, 20, 30 g/kg) diets (350 g/kg CP; 3.4 kcal digestible energy/g) Nile tilapia juveniles. Fish (average weight 1.7 ± 0.1 g) were distributed three 40 L aquaria per treatment (13 fish/aquaria) a completely randomized design. Over 35 days, received experimental times daily to apparent...

Diseases outbreaks are a major concern in intensive fish farming because exposed to stressors which may negatively affect their physiology. This study set out determine effects of dietary levamisole (Levamisole HCl; SIGMA ® ) on performance and hematology pacu, Piaractus mesopotamicus , juveniles. Fish (55.94 g) were stocked into 24 plastic aquaria (500 L; 15 per aquarium) fed for 30 d with commercial diet 0, 50, 100, 200, 400, 800 mg/kg levamisole, an extra d, control totally randomized...

Paschoal, J. A. R., Bicudo, Á. A., Cyrino, E. P., Reyes, F. G. Rath, S. Depletion study and estimation of the withdrawal period for oxytetracycline in tilapia cultured Brazil. vet. Pharmacol. Therap. 35 , 90–96. Defining pharmacokinetic parameters depletion intervals antimicrobials used fish represents important guidelines future regulation by Brazilian agencies use these substances farming. This article presents a (OTC) tilapias ( Orechromis niloticus ) farmed under tropical conditions...

Haematopoiesis and blood cells' functions can be influenced by dietary concentration of nutrients. This paper studied the effects protein:energy ratio on growth haematology pacu, Piaractus mesopotamicus. Fingerling pacu (15.5±0.4 g) were fed twice a day for 10 weeks until apparent saciety with diets containing 220, 260, 300, 340 or 380 g kg−1 crude protein (CP) 10.88, 11.72, 12.55, 13.39, 14.22 MJ digestible energy (DE) in totally randomized experimental design, 5 × factorial scheme (n=3)....

Abstract Information on nutritional requirement of some Brazilian farmed fish species, especially essential amino acids (EAA) requirements, is scarce. The estimation requirements based acid composition a fast and reliable alternative. Matrinxa, Brycon amazonicus , curimbata, Prochilodus lineatus are two important with potential for aquaculture. objective the present study was to estimate these species analyze similarities among different by cluster analysis. To requirement, following formula...

Intensification of aquaculture production systems exposes fish to numerous stressors, which may negatively affect their health. This study determined the effects increasing levels dietary mannan oligosaccharides (ActiveMOS ® -Biorigin) on biochemical and hematological parameters juvenile pacu, Piaractus mesopotamicus. Fish (44.04 ± 5.27 g) were randomly distributed into 24 tanks (500 L; 10 fishes per tank) fed during 63 days with a commercial diet supplemented 0.0, 0.2, 0.4, 0.6, 0.8, 1.0,...

The effects of four levels dietary ractopamine (RAC) on growth, body composition and hematology pacu, Piaractus mesopotamicus juveniles (103.6±3.3g) were studied. Fish housed into 12 circular tanks 1 m3 - 15 fish per tank fed for 60 days with practical diets supplemented 0; 10; 20 or 40mg RAC kg diet, in a totally randomized design trial (n=3). containing up to RAC/kg diet did not have improved growth parameters. There no significant differences hematocrit, hemoglobin mean corpuscular...

The objective of this work was to evaluate corn gluten meal (CGM) as a substitute for fish in diets striped catfish (Pseudoplatystoma fasciatum) juveniles. Eight isonitrogenous (46% crude protein) and isoenergetic (3,450 kcal kg-1 digestible energy) diets, with increasing levels CGM - 0, 6, 12, 18, 24, 30, 36, 42% -, were fed juvenile (113.56±5.10 g) seven weeks. Maximum values weight gain, specific growth rate, protein efficiency ratio feed conversion ratio, evaluated by polynomial...

Intensification of aquaculture production systems exposes fish to numerous stressors, which may negatively affect their growth and limit profitability systems. This study determined effects increasing levels dietary mannanoligosaccharides on intestine morphology pacu. Fish (44.04 g) were randomly distributed into 32 tanks (500 L; 10 fishes per tank) fed during 63 days with a commercial diet supplemented 0.0; 0.2; 0.4; 0.6; 0.8; 1.0; 1.5 2.0% mannanoligosaccharides. Growth parameters did not...

Between October 2001 and March 2002, 103 specimens of A. tricolor from Angra dos Reis (23°01'S, 44°19'W), in the coastal zone State Rio de Janeiro, Brazil, were analyzed order to study their metazoan parasite infracommunities. Ten species parasites collected: 4 digeneans, 1 cestode, acantocephalan, 2 nematodes, copepod, hirudinean; 77.7% fishes parasitized by one or more metazoan, with a mean 3.5 ± 6.2 parasite/fish. Digenean was most dominant that accounted for 53.2% total collected;...

The objective of this study was evaluating mesquite meal as a substitute for corn in diets Nile tilapia juveniles. Four isoproteic (34% crude protein) and isocaloric (3,150 kcal kg-1 digestible energy) were formulated corresponding to replacement levels (0, 33, 66 100%) by meal. Two hundred forty juveniles (1.55 ± 0.02 g) housed circular tanks (20 fish per tank 310 L) completely randomized experimental design (n = 3). Fish fed apparent satiation three day (8:30 a.m., 12:30 p.m. 4:30 p.m.) 70...

The search for balanced diets, which may elicit improved growth of fish, requires appropriate selection available protein sources. This study aims at clustering feedstuffs according to amino acid profile, determining ones show essential acids (EAA) profiles closer the ideal dietary requirements Nile tilapia (Oreochromis niloticus), and studying relationship among groups. Tabled data on EAA more cystine tyrosine, in relation lysine contents, 40 ordinarily used formulate fish diets were...

The apparent digestibility coefficients (ADC’s) of dry matter (DM), crude protein (CP), and gross energy (GE) conventional feedstuffs (cottonseed meal-CSM, soybean meal-SBM, wheat bran-WHB, corn-COR) regional alternative (common bean residue meal-CBR, mesquite meal-MES, pasta by-product meal-PBM) were determined for hybrid juvenile tambacu Colossoma macropomum × Piaractus mesopotamicus. DM GE decreased (p<0.05) as fiber content the ingredients increased. No differences (p>0.05) found among...

Many methods to estimate amino acid requirement based on profile of fish have been proposed. This study evaluates the methodology proposed by Meyer & Fracalossi (2005) and Tacon (1989) acids fish, which do exempt knowledge previous nutritional reference acid. Data pacu, Piaractus mesopotamicus, were used validate de accuracy those methods. Fracalossi's Tacon's estimated lysine respectively, at 13 23% above determined using dose-response method. The values both lie within range requirements...