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| Lima, Francisco Roberto dos Santos; Cavalcante, Davi de Holanda; Rebouças, Vanessa Tomaz; Sá, Marcelo Vinícius do Carmo e. |
| The present study aimed at determining the effects of the interaction between afternoon aeration and stocking density of Nile tilapia on variables of water and soil quality, growth performance and effluent quality. The experiment was a 3 x 2 factorial randomized block design, with three stocking densities (8, 12 and 16 fish per tank or 43.5, 65.3, and 87.0 g m-3) under two mechanical aeration regimes, absence (control; three replicates) and afternoon aeration (four replicates). The afternoon aeration was carried out from 12.00 a.m. up to 18.00 p.m. from the 3rd week until the end of the experiment. Except for the 16-fish tanks, the lowest concentrations of total ammonia nitrogen were found in the tanks with higher density of fish provided with afternoon... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Piscicultura; Tilápia fish farming; Total ammonia nitrogen; Unionized ammonia; Nitrite. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/27093 |
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| Rebouças, Vanessa Tomaz; Lima, Francisco Roberto dos Santos; Cavalcante, Davi de Holanda; Sá, Marcelo Vinícius do Carmo e. |
| The present work aimed at reassessing the suitable range of water pH for culture of Nile tilapia, Oreochromis niloticus L. juveniles in eutrophic water. Two hundred and forty tilapia juveniles (1.37 ± 0.04 g) were stocked in twenty 250-L polyethylene tanks (12 fish per tank) for eight weeks. In the control tanks, the pH of water was not adjusted at any time, varying freely over the entire study. In the slight acidification treatment, the culture water was acidified daily to reach a water pH between 5.5 and 6.5. In the moderate acidification treatment, there were daily applications of HCl solution to reach a water pH between 4.5 and 5.5. In the alkalinization treatment, tanks received daily applications of Na2CO3 and NaOH to achieve a water pH between 8.5... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquicultura piscicultura pH of water; Tilapia; Aquaculture. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/32051 |
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| Rebouças, Vanessa Tomaz; Lima, Francisco Roberto dos Santos; Cavalcante, Davi de Holanda; Sá, Marcelo Vinícius do Carmo e. |
| The present work aimed at determining the tolerance of Nile tilapia juveniles to highly acidic rearing waters and the effects of water acidity on the quality of tank effluents. The experimental design consisted of four treatments with different water pH values (4.12 ± 0.84; 5.13 ± 0.74; 6.14 ± 0.64 and 8.06 ± 0.48), with five replicates each. No exchange of water was performed throughout the study, only water replenishment to maintain the initial level. Variables of water quality, soil, growth performance, metabolism and effluents were monitored for eight weeks. Despite the lower total ammonia nitrogen (TAN) concentration in the pH 8 tanks, their levels of non-ionized ammonia (NH3) were the highest ones. At the end, the lowest body weight of fish was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Piscicultura; Tilápia aquaculture; Oreochromis niloticus; Acidophilic fish; Ammonia; PH. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/27031 |
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| Cavalcante, Davi de Holanda; Lima, Francisco Roberto dos Santos; Rebouças, Vanessa Tomaz; Sá, Marcelo Vinícius do Carmo e. |
| The objective of the present work was to assess the possible benefits of the installation of underwater structures for periphyton in bioflocs tanks for Nile tilapia, Oreochromis niloticus, submitted to feed restriction (artificial diet). The experimental treatments evaluated were: (1) BFT: bioflocs technology for aquaculture with no feed restriction; (2) BFT-30: the same as (1) but with feed restriction at 30%; (3) BP: biophyton technology for aquaculture, that is, integration between bioflocs and periphyton in the same rearing unit, with no feed restriction; (4) BP-30: the same as (3) but with feed restriction at 30%. The underwater structures for periphyton in the BP and BP-30 tanks were not able to reduce the concentrations of ammonia, nitrite, nitrate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquicultura aquaculture; Bioflocs; Environmental sustainability.. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/33122 |
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