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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Utiliza??o de embri?es liofilizados e flocos de Artemia na diversifica??o nutricional de p?s-larvas do camar?o marinho Litopenaes vannamei (Boone, 1931)

Cavalcante, Pedro Herc?lio de Oliveira 19 May 2006 (has links)
Made available in DSpace on 2014-12-17T14:02:03Z (GMT). No. of bitstreams: 1 PedroHOC.pdf: 308732 bytes, checksum: f9e88debb287b72111d2b3aeb9898ae7 (MD5) Previous issue date: 2006-05-19 / The objective of the current study was to evaluate the zootechnical performance (survival and growth) of Litopenaeus vannamei post-Iarvae fed an artificial shrimp diet supplemented with Artemia flakes or freeze-dried Artemia embryos. For that purpose, 20 culturing units were individually stocked with 50 shrimp post-Iarvae (average dry weight of 0,3 ? 0,03 mg) at a stocking density of 20 post-larvae per liter, and fed the experimental diets to satiation during 20 days. The experimental design consisted of four diets (T1, T2, T3 and T4) with five repetitions each. For treatments T1, T2 and T3, dietary supplements of 5mg of Artemia flakes (T1), freeze-dried Artemia embryos (T2), and of the commercial shrimp diet (T3) were offered 2 hours after the shrimp were initially fed the commercial shrimp diet. For treatment T4 (control), no additive was offered 2 hours after the initial feeding. Shrimp survival, absolut (GPA) and relative increase in weight (GPR), and specific growth rate (TCR) were used as evaluation criteria. After the experimental period, no significant statistical differences (p>0,05) in survival were observed. Regarding growth, the dietary treatment which used freeze-dried Artemia embryos as an additive (T2) presented the best results for GPA (6,7 ? 0,7 mg). There were no statistical differences within treatments T1, T3 and T4 (p>0,05). AIso, post-larvae fed freeze-dried embryos (T2) showed a relative increase in weight (2241,4%) which differed significantly (p<0,05) from T4(1911,7%) but not from T1 (1801,6%) or T3 (1946,7%). In conclusion, the results of the current study indicate that an artificial shrimp diet supplemented with freeze-dried Artemia embryos fulfils the nutritional requirements of post-larvae L. vannamei and promotes a better growth than diets not supplemented with Artemia flakes / O presente trabalho teve por objetivo avaliar o desempenho zoot?cnico (sobreviv?ncia e crescimento) de p?s-larvas de Litopenaeus vannamei alimentadas com dietas comerciais suplementadas com flocos ou embri?es liofilizados de Artemia. Para isso, durante um per?odo de 20 dias, cada uma das 20 unidades de cultivo foram estocadas com 50 p?s-larvas de peso seco m?dio inicial de 0,3 ? 0,03 mg (a uma densidade de 20 p?s-larvas por litro) e alimentadas de modo ad libitum. O desenho experimental foi inteiramente casualizado com quatro tratamentos (T1, T2, T3 e T4) com cinco r?plicas cada. Para os tratamentos T1, T2 e T3, 2 h ap?s a oferta inicial da ra??o comercial, um suplemento adicional de 5mg aditivo era ofertado. Os aditivos utilizados consistiram de Artemia em flocos (T1), embri?es liofilizados de Artemia (T2) e ra??o comercial (T3). Para o tratamento T4 (controle), n?o houve oferta de aditivo 2 h ap?s o arra?oamento. O protocolo experimental utilizou como crit?rios de avalia??o a sobreviv?ncia, o ganho de peso absoluto (GPA), o ganho de peso relativo (GPR) e a taxa de crescimento relativo (TCR). Ap?s o per?odo experimental, n?o foram observadas diferen?as estat?sticas significativas (p>0,05) para o crit?rio sobreviv?ncia. Para o crit?rio crescimento, o tratamento que utilizou embri?es de Artemia como aditivo (T2) para p?s-larvas de camar?o L. vannamei apresentou o melhor desempenho para o GPA (6,7 ? 0,7 mg). Os tratamentos T1, T3 e T4 n?o diferiram estatisticamente (p>0,05) entre si. Igualmente, as p?s-larvas alimentadas com embri?es liofilizados (T2) apresentaram ganho de peso relativo (GPR) de 2241,4%, o qual diferiu significativamente (p<0,05) do tratamento T4 (1911,7%), mas n?o dos tratamentos T1 (1801,6%) ou T3 (1946,7%). Em conclus?o, os resultados do presente estudo indicam que uma dieta artificial suplementada com embri?es liofilizados de Artemia atende ?s necessidades nutricionais das p?s-larvas de L. vannamei e promove um melhor crescimento em rela??o a dietas comerciais n?o suplementadas ou parcialmente suplementadas com flocos de Artermia

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