-The objective of the present study was to evaluate the protein requirement of juvenile Trichogaster lalius, blue variety. The experimental design was of randomised blocks (B1 = initial weight of 1.04±0.05 g and B2 = 1.36±0.02 g), with two replicates within each block and five treatments (230, 270, 310, 350 and 390 g CP/kg diet). The fish were fed to satiation, three times a day for 90 days. The study evaluated: survival rate, weight gain, final length, feed intake, feed conversion ratio, protein efficiency ratio, specific growth rate and condition factor. There was a linear effect of dietary protein levels for protein efficiency ratio, specific growth rate (positive linear effect) and feed conversion ratio (negative linear effect). For weight gain, final length, feed intake and condition factor a quadratic effect of dietary protein levels was observed, with estimated values of 409.8, 366.2, 317.4 and 365.0 g CP/kg diet, to improve their performance parameters. Analysis of growth based on the length of the fish shows that 366.2 g of CP/kg diet meets the protein requirement of juvenile Trichogaster lalius, blue variety.
This study aimed to evaluate the potential of oregano oil as a growth promoter for the yellowtail tetra, Astyanax altiparanae. The fish (1.46 ± 0.09 g) were distributed into twenty‐four 60‐L aquaria at a stocking density of 0.5 fish/L. Six isonitrogenous (350 g crude protein/kg) and isocaloric (4272 kcal gross energy/kg) diets containing 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 g/kg of oregano oil were evaluated. At the end of 90 d there was a quadratic effect of oregano oil levels for weight gain, specific growth rate, protein efficiency ratio and carcass weight, and the estimated values to maximize these variables were between 0.2 and 0.6 g/kg. There was also a quadratic effect on the feed conversion ratio, and the estimated value to improve this variable was 0.62 g/kg. A positive linear effect of the treatments was observed for muscle glycogen. With increased levels of oregano oil in the diet, there was a reduction in dry matter and ether extract and an increase in the protein content of the carcass. Thus, it can be concluded that oregano oil, at the level of 0.5 g/kg, acts as a growth promoter for A. altiparanae by improving growth performance and carcass composition.
We aimed to evaluate the effects of Curcuma longa as growth promoter, skin pigmentation enhancer, and stress reducer in diets of Trichogaster labiosa after transport. We used five diets containing 0.0, 1.0, 5.0, 10.0, and 25.0 g kg −1 of turmeric rhizome powder. We observed quadratic effects of turmeric supplementation for feed intake, weight gain, final length, and specific growth rate. The estimated amount of turmeric that decreased these variables ranged from 15.53 to 16.39 g kg −1 . Quadratic effects of supplementation of turmeric for cyan and black dorsal skin coloring indices were observed, with estimated values that increased these variables equal to 15.03 and 17.44 g kg −1 , respectively. After fish transport, quadratic effects of turmeric were observed for the cyan and black dorsal skin depigmentation indices, with estimated values that increased these variables equal to 13.29 and 17.04 g kg −1 , respectively. These results demonstrate that supplementation with turmeric at levels up to 17 g kg −1 causes further reduction in skin color due to the stress of transport. Thus, Curcuma longa acts neither as a growth promoter nor as a stress reducer for Trichogaster labiosa. Curcuma longa does not improve the orange pattern of skin pigmentation in the strain of T. labiosa orange thick-lipped gourami. How to cite: Nascimento, L. S.; Reis, S. M.; Ferreira, P. M. F.; Kanashiro, M. Y.; Salaro, A. L. and Zuanon, J. A. S. 2019. Effects of Curcuma longa rhizome on growth, skin pigmentation, and stress tolerance after transport of Trichogaster labiosa. Revista Brasileira de Zootecnia 48:e20160282.
Com o objetivo de descrever o desenvolvimento das estruturas sensoriais quimiorreceptoras, corpúsculos gustativos e epitélio olfativo, das larvas de piracanjuba, Brycon orbignyanus, entre zero e 172 horas após eclosão, exemplares foram coletados a cada meia hora e fixados em fluído de bouin, por6 a 8 horas, e transferidos para solução de álcool 70%. As lâminas histológicas foram coradas por pelos métodos HE e Alcian Blue. As análises foram realizadas com fotomicroscópio de luz trinocular, acoplado a um microcomputador contendo um software de análise de imagens. Verificou-se que as larvas de piracanjuba, com 28 horas após a eclosão, desenvolveram estruturas quimiossensoriais importantes, como epitélio sensorial na cavidade olfatória e corpúsculos gustativos projetados na cavidade bucofaringiana e nas valvas orais, sugerindo que a quimiorrecepção é requerida na primeira alimentação exógena, que acontece neste momento. às 72 horas após eclosão, verificou-se a cavidade olfatória ampla e funcional e aumento de corpúsculos gustativos na cavidade bucofaringiana, o que revela uma elevada sensibilidade gustatória que, combinada com comportamento alimentar ativo, típico da espécie, sugere habilidade para detectar e selecionar alimentos e ingerí-los ou rejeitá-los, além de reconhecer substâncias tóxicas e venenosas. As larvas de piracanjuba, com 172 horas após eclosão, no final da metamorfose, apresentaram estruturas quimiossensoriais desenvolvidas, lamelas olfatórias formadas e gustação desenvolvida.
RESUMO Um dos maiores desafios no ensino de ciências é a aplicação de aulas práticas, uma vez que fatores como falta de material e laboratório, elevado número de alunos em sala de aula e a carga horária dos docentes são relatados como empecilhos para o desenvolvimento destas práticas. Diante do exposto, objetivou-se avaliar o aprendizado dos discentes após a inserção das práticas durante o ensino de vírus, bactérias, fungos e protistas. Foram analisadas duas turmas da 6ª serie (7º ano) do Ensino Fundamental II de uma escola pública municipal de Itapetinga, Bahia, totalizando 64 alunos. Uma turma foi submetida às aulas teóricas e práticas e a outra apenas as aulas teóricas. Para a coleta de dados foi aplicado um questionário prévio e outro após o término de cada conteúdo. Os dados percentuais entre as duas turmas foram analisados por meio do teste exato de Fisher (p<0,05). Os resultados indicaram que a turma com aulas teóricas e práticas soube melhor caracterizar e diferenciar vírus, bactérias e fungos quando comparada à turma sem aulas práticas. Contudo, no ensino de protistas não houve diferença entre as turmas. Com isto, foi possível concluir que a inserção das aulas práticas contribui para o melhor desempenho dos alunos.
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