<b>Small crumbled diet versus powdered diet in restricted feeding management of juvenile Nile tilapia</b> - doi: 10.4025/actascianimsci.v35i2.16767

• Main Authors: José Nacélio Oliveira-Segundo, Michael Masaki Freitas Akao, Francisco Roberto dos Santos Lima, Marcelo Vinícius do Carmo e Sá
• Format: Article
• Language: English
• Published: Editora da Universidade Estadual de Maringá (Eduem) 2013-03-01
• Series: Acta Scientiarum: Animal Sciences
• Subjects: unpelleted diet; crumble; particle size; restricted feeding; water quality; Oreochromis niloticus
• Online Access: http://www.periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/16767

<!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:DoNotShowRevisions /> <w:DoNotPrintRevisions /> <w:DoNotShowMarkup /> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning /> <w:ValidateAgainstSchemas /> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:BreakWrappedTables /> <w:SnapToGridInCell /> <w:WrapTextWithPunct /> <w:UseAsianBreakRules /> <w:DontGrowAutofit /> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument> </xml><![endif]--><p class="aresumo" style="mso-pagination: none;"><span style="letter-spacing: -.2pt; mso-ansi-language: EN-US;" lang="EN-US">The pellet size of the diet can affect both fish growth performance and the water quality of the rearing units. The present work assessed the effects of feeding juvenile Nile tilapia, <em style="mso-bidi-font-style: normal;">Oreochromis niloticus</em> (L.) a small crumbled diet (SCD; 0.8 mm) on water quality and growth performance. Fish were reared for six weeks in twenty 250-L polyethylene outdoor tanks at a density of 10 juveniles tank^-1 (40 fish m^-3).<span style="color: #111111;"> </span>There were two feeding rates (standard and restricted) and two types of artificial fish diet (powdered and SCD). The standard feeding rates were reduced by 30% for restricted feeding. The concentrations of free CO₂,reactive phosphorus, total ammonia nitrogen (TAN) and nitrite were higher in the full-fed tanks relative to the restricted-fed tanks. In the standard feeding rate groups, those tanks fed SCD had lower TAN and nitrite concentrations than tanks fed a powdered diet. The final body weight and specific growth rate of fish fed a restricted SCD were higher than the full-fed tanks. The higher levels of food waste in the powdered-diet tanks lead to impairment of fish growth performance.</span></p> <p class="apalavrachave" style="mso-pagination: none;"><span style="letter-spacing: -.2pt; mso-ansi-language: EN-US;" lang="EN-US"><em style="mso-bidi-font-style: normal;"> </em><span style="color: red;"> </span></span></p> <!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles> </xml><![endif]--><!--[if !mso]><object classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object> <mce:style><! st1:*{behavior:url(#ieooui) } --> <!--[endif] --><!--[if gte mso 10]> <mce:style><! /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} --> <!--[endif] --><p> </p>