The aim of this study was to evaluate the effect of dietary supplementation with the autochthonous probiotic bacteria Bacillus cereus on growth performance, haematological parameters and survival of tambaqui (Colossoma macropomum). Tambaqui fingerlings (0.94 ± 0.02 g) were fed for 120 days the following diets: basal (without probiotic) and three supplemented diets (4.2 × 10 4 , 3.9 × 10 6 and 3.3 × 10 8 CFU/ g). Growth performance and haematological parameters were evaluated every 30 days. Thereafter, fish were challenged against Aeromonas hydrophila and survival was evaluated. Probiotic B. cereus improved weight and length gains (p < 0.05), and increased neutrophils and thrombocyte counts (p < 0.05) in tambaqui supplemented with 3.9 × 10 6 CFU/g diet. Challenged fish fed unsupplemented diet presented the lowest survival rate (33.4%) while fish fed diets supplemented at 4.2 × 10 4 , 3.9 × 10 6 and 3.3 × 10 8 CFU/g B. cereus had 88.8%, 80.5% and 80.5% relative per cent survival respectively. These results demonstrated that B. cereus supplemented as probiotics to C. macropomum for 120 days improved physiological and haematological responses, leading to enhanced survival in this fish species. K E Y W O R D Samazon, bacterium, fish, haematology, nutrition, performance
RESUMO: A fitoterapia vem sendo utilizada em criação de peixes a fim de promover estabilidade no ambiente de cultivo e na profilaxia de doenças, contribuindo para melhoria do bem-estar animal. Dentre os fitoterápicos, a canela (Cinnamon zeylanicum) possui atividade antioxidante, antiinflamatória, antifúngica e antiparasitária, além de efeito imunoestimulante. O objetivo do trabalho foi avaliar os efeitos do extrato aquoso de canela sobre o desempenho produtivo de larvas do peixe ornamental amazônico Pyrrhulina brevis. Foram avaliadas cinco concentrações de extrato aquoso (0; 0,25; 0,50; 0,75 e 1,0 g/L) em 4 repetições, durante 20 dias. A utilização de 1,0g/L de extrato de Cinnamon zeylanicum favorece o desempenho produtivo das larvas, com melhores resultados para comprimento total final, taxa de crescimento específico para comprimento e promove 100% de sobrevivência ao lote (P<0,05). Este é o primeiro relato da eficácia do uso de extrato aquoso de canela como promotor de crescimento na larvicultura de peixes.Palavras-chave: fitoterapia, peixe ornamental, sanidade. AQUEOUS CINNAMON EXTRACT AS A GROWTH PROMOTER FOR LARVAE OF THE ORNAMENTAL AMAZON FISH Pyrrhulina brevisABSTRACT: Phytotherapy has been used in fish farming to promote stability in the rearing environment and for the prophylaxis of diseases, improving animal well-being. Among phytotherapeutic agents, cinnamon (Cinnamon zeylanicum) exhibits antioxidant, anti-inflammatory, antifungal and antiparasitic activity, in addition to immunostimulatory effects. The objective of this study was to evaluate the effect of an aqueous cinnamon extract on the productive performance of larvae of the ornamental Amazon fish Pyrrhulina brevis. Five concentrations of the aqueous extract (0, 0.25, 0.5, 0.75 and 1.0 g/L) were evaluated in four replicates over a period of 20 days. The use of 1.0 g/L of Cinnamon zeylanicum extract favored larval performance, improving final total length and the specific growth rate in length and promoting 100% survival of the batch (P<0.05). This is the first study demonstrating the efficacy of the use of aqueous cinnamon extract as a growth promoter in fish larviculture.
The present study evaluates the influence of anesthesia on the parasitic fauna of monogenea fish parasites, as its intensity and viability. Two experiments were conducted: Evaluation of an anesthetic method by sprinkling eugenol directly on gills and evaluation of monogenea motility and viability; Comparison of immersion and directly sprinkling on the gills with benzocaine and eugenol followed by evaluation on parasite intensity. The results suggest that the anesthetic sprinkling didn't interfere in the parasite motility, morphology and body surface integrity analyzed by fluorescence method. The monogenean intensity in the gills was lower in fish anesthetized by immersion method compared to the sprinkling method and the control group. This method of anesthesia can be used in parasitological studies.Keywords: parasitology, animal welfare, humane slaughter, histopathology. Anestesia por meio de aspersão nas brânquias de tambaquiColossoma maropomum não influencia a intensidade e a morfologia de monogeneas ResumoO presente estudo avalia a influência da anestesia sobre a fauna parasitária de monogeneas em peixes, sua intensidade e sua viabilidade. Dois experimentos foram realizados: Avaliação de um método anestésico por aspersão eugenol diretamente nas brânquias e avaliação da motilidade das monogeneas e sua viabilidade; e Comparação entre imersão e aspersão diretamente nas brânquias com benzocaína e eugenol, seguido de avaliação sobre a intensidade parasitária. Os resultados sugerem que a aspersão do anestésico não interferiu na motilidade, morfologia, superfície corporal e integridade do parasita, analisadas pelo método de fluorescência. A intensidade de monogenéticos nas brânquias foi menor nos peixes anestesiados pelo método de imersão em comparação com o método de aspersão e o grupo controle. O método de anestesia por aspersão nas brânquias pode ser utilizado em estudos parasitológicos.Palavras-chave: parasitologia, bem-estar animal, o abate humanitário, histopatologia.
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