Summary This study aimed to analyze the influence of different temperatures on embryonic and larval development discus fish Symphysodon aequifasciatus determine time required for beginning exogenous feeding. Eggs larvae were obtained from natural spawns distributed in five treatments: 24.0, 26.0, 28.0, 30.0, 32.0 °C. To assess developmental stages structures, samples taken at regular intervals checked under an optical microscope. At end experimental period, statistical analysis was...

Abstract We evaluated citric acid supplementation (0, 10, 20, and 30 g/kg) in plant protein‐based diets for juvenile tambaqui, Colossoma macropomum . In Experiment 1, fish ( n = 160; 27.56 ± 2.73 g) were distributed 310 L tanks 16) 80 days. Zootechnical performance, hematological parameters, mineral composition (muscle bones) did not differ significantly p > .05). The inclusion of acid‐reduced pH .001) stomach .035). 2, 60; 48.00 1.98 fecal collection aquaria (200 L) 21 following...

This study aimed to investigate pirarucu's (Arapaima gigas) ability trigger a self-feeding system regulate protein intake between two standard diets that contained 39% and 49% of crude protein. The same allowed the evaluation daily feeding locomotor activity rhythms. Eighteen fish (654.44±26.85g) were distributed into six 250 L tanks (3 fish/tank). Fish had free access both (39% vs. protein) by feeders (2 per tank), adapted be activated themselves. was connected computer system. After an...

The aim of this study was to investigate the ability tambaqui (Colossoma macropomum) balance energy (E) and protein (P) ratio by encapsulated diets (without sensory properties). Thirty fish (71.37 ± 2.58 g) were distributed in six 250-litre tanks. Protein (P), carbohydrate (C) fat (F) separately ensure same properties each macronutrient. Diets varied terms macronutrients allow maximal/minimal possibility ingesting nutrient following a geometric approach. P, C F capsules provided for 40 days...

The objective of this study was to evaluate the performance three Nile tilapia Oreochromis niloticus strains cultivated in cages and subjected different feeding programmes. Initially, 31,200 juveniles with an average weight 61.15 g were distributed 48 cages. Two genetically improved used together one from Fish Culture Section Universidade Federal de Lavras (UFLA). fish four programmes, consisting levels crude protein (CP) diets provided at stages cultivation. There no interaction effect...

O objetivo deste trabalho foi determinar a densidade de estocagem matrinxã (Brycon orthotaenia) em tanques-rede, considerando o desempenho produtivo. Foram utilizados 5.280 juvenis Brycon orthotaenia com peso inicial 115,2g±5,7, os quais foram distribuídos 16 tanques-rede 4³m nas densidades 45, 70, 95 e 120 peixes m-3 quatro repetições. Os alimentados ração comercial 40% proteína bruta durante período experimental. dados submetidos à análise variância regressão linear para estimativa do...

ResumoO objetivo com este trabalho foi avaliar o desempenho e rendimento de carcaça suínos na fase terminação machos castrados fêmeas, recebendo dietas contendo diferentes níveis ractopamina. Foram utilizados 60 animais, peso inicial 84,27 ± 2,26kg, aleatoriamente distribuídos para uma das seis experimentais compostas por ractopamina (zero; três; seis; nove; 12 15ppm) cinco repetições tratamento. Ao final do período experimental, avaliado efeito dos sobre (PF), consumo ração médio diário...

ABSTRACT: The present research aimed to investigate the stabil¬¬ity of pellets and phosphorus leaching diets formulated for juveniles Nile tilapia (Oreochromis niloticus), with different sources exposure times in water. Six were elaborated by varying source (1 ‒ dicalcium phosphate (DP); 2 meat bone meal (MBM); 3 poultry (PM); 4 anchovy (AM); 5 filleting industrial (TM); 6 calcined (CBM)) and, then, submitted four water (5, 10, 15 20 minutes), three replicates. Thus, 72 aquariums 30‒liters...

This study aimed to evaluate the effect of crude protein levels on growth performance and body composition juvenile Brycon amazonicus. Four experimental diets were formulated include increasing (CP) at 30, 35, 40 45%. Each diet was fed three groups amazonicus, initial stocking weight 3.2 ± 1.3 g, for 60 days under a completely randomized design. Fish randomly stocked (n = 50 per tank) in 12 circular tanks 500 liters volume 28°C. They evaluated individual gain (WG), apparent feed conversion...

This study aimed to evaluate the antioxidant potential of citric acid in plant protein based-diets offered juvenile tambaqui, Colossoma macropomum. Four isonitrogenous and isoenergetic diets containing different levels (0, 10, 20, 30 g.kg−1) were formulated. Fish (n = 160; 27.56±1.03 g) randomly distributed 310-L water tanks 16), with four replicates per treatment. After experimental period (80 days), animals anesthetized, blood was collected for cell count. They [...]

We evaluated the effect of light–dark (LD) cycle on energy expenditure indicators for two species Amazonian fish commercial interest, oscar (Astronotus ocellatus) and matrinxã (Brycon amazonicus). Fish were exposed to a 12:12 h LD cycle, with lights at 'zeitgeber time' (ZT) = 0 h. Six animals used blood collection every 4 24 (six time points, three in light period dark period). Most haematological parameters exhibited daily rhythms acrophase end phase or beginning both species, which may be...

A 127-day experiment was conducted to evaluate the effect of feeding strategies on juvenile tambaqui's (Colossoma macropomum) growth, body composition, haematological and biochemical parameters, excretion pattern economic indices. Fifteen tanks randomly stocked 150 tambaqui (82.0 ± 0.8 g, mean SEM) subjected three (n = 5): self-feeder system (T1); automatic-feeding with set meals/day (T2) apparent satiety (T3). The results revealed that fish T1 T3 showed best feed intake, conversion ratio,...

The experiment was conducted in the Department of Animal Science Federal University Lavras. objectives were to obtain chemical, physical and sensory charac-teristics pork meat receiving different levels ractopamine diet, period 28 days. Sixty hybrids pigs used, being 30 castrated males females, selected for high deposition lean meat, with initial weight 84,27±2,26 kg. experimental design a completely randomized block six treatments (0, 3, 6, 9, 12 15 ppm ractopamine) 6 repetitions plot...

Ractopamine is a drug used as an additive in animal production to improve growth, body composition, and efficiency, although its use fish still poorly known. This study aimed evaluate ractopamine hydrochloride (RAC) effects at increasing levels (0, 10, 20, 40 mg kg-1) Nile tilapia (Oreochromis niloticus) diets during days by considering growth performance, muscle fiber morphometry. One hundred twelve (mean initial weight 518.63 ± 5.49 g) were housed 16 circular tanks (450 L), following...

The present work aimed to evaluate the effect of metionine dietary levels on performance and chemical composition from Nile tilapia, during sex reversal phase. A 35 liter-aquarium with 15 animals was considered as an experimental unit. treatments had been constituted by larvae feeding diets containing 0.56; 0.65; 0.75; 0.85; 0.95% total metionine. were fed ad libitum regimen. In end period, parameters length weight, daily weigh gain, factor condition survival evaluated. carcass...

Developing a rearing technology requires the determination of optimum stocking density. This study aimed to determine best density for Brycon orthotaenia juveniles grown in net cages, during phase. The research was conducted at Experimental Farm EPAMIG, Felixlândia, Minas Gerais State, Três Marias Reservoir. 9,000 fingerlings were distributed into 12 2 m3each, according completely randomized design with three replications and four different densities (150, 300, 450, 600 fish m-3). Random...

O cultivo de moluscos foi introduzido no Brasil em 1960 estado Santa Catarina, porém apenas 1989 desenvolveu-se como uma importante alternativa econômica. Entretanto, o bivalves escala comercial ainda é restrito a poucas espécies, Crassostrea gigas, rhizophorae, Nodipecten nodosus e Perna perna. Apesar pouco explorado, atividade que atinge alcance social econômico, beneficiando diversos setores da sociedade, gerando empregos, fixando populações nativas litorâneas seu ambiente tradicional...