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| Arbeláez-Rojas,Gustavo Alberto; Moraes,Gilberto; Nunes,Cleujosí da Silva; Fabrizzi,Fernando. |
| Abstract: The objective of this work was to evaluate the effect of stocking density associated with the swimming exercise on the stress responses of Brycon amazonicus. During 70 days, fish were subjected to three stocking densities: LD, low density of 88 fish per cubic meter; ID, intermediary density of 176 fish per cubic meter; and HD, high density of 353 fish per cubic meter. These densities were combined with static water (non-exercised group) or moderate-speed water (exercised group). Chronic stress was observed in HD, and plasma cortisol and glucose increased with the stocking densities. In HD, levels of plasma cortisol were significantly lower in exercised fish (135 ng mL-1) than in non-exercised ones (153 ng mL-1). The greatest hepatic glycogen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal welfare; Intensive fish farming; Metabolic responses; Physical exercise.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000100001 |
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| Jordan,Rodrigo A.; Geisenhoff,Luciano O.; Oliveira,Fabricio C. de; Santos,Rodrigo C.; Martins,Elton A. S.. |
| ABSTRACT In the aquaponic system, the characteristics of the materials used as substrate directly affect plant development, because besides acting as a support base, they must present a surface to fix microorganisms, responsible for the conversion of nutrients into forms more easily available to plants. Thus, the objective of this study was to evaluate the effect of four growing substrates on the yield of lettuce grown in aquaponic system. The experimental design was randomized blocks with four treatments, which corresponded to the substrates, and six replicates. Plants were grown using the nutrient film technique (NFT) system. The substrates used in the experiment were: coconut shell fiber with crushed stone #3, expanded vermiculite, zeolite and phenolic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biofilter; Biodigestion; Soilless cultivation; Intensive fish farming. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100027 |
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