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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

Utilização de substrato artificial em cultivo do camarão Litopenaeus vannamei, em água oligohalina e meio heterotrófico

MONTEIRO, Sâmia Régia Rocha 29 August 2008 (has links)
Submitted by (edna.saturno@ufrpe.br) on 2017-02-21T16:48:08Z No. of bitstreams: 1 Samia Regia Rocha Monteiro.pdf: 361943 bytes, checksum: 282e86342e0a7dc7cefcb1a57d78fd60 (MD5) / Made available in DSpace on 2017-02-21T16:48:08Z (GMT). No. of bitstreams: 1 Samia Regia Rocha Monteiro.pdf: 361943 bytes, checksum: 282e86342e0a7dc7cefcb1a57d78fd60 (MD5) Previous issue date: 2008-08-29 / The use of artificial substrates in aquaculture has been used to provide the increase of culture area and natural food, improving the water quality of shrimp performance. In order to maximize the survival, feed conversion and final weight of marine shrimp Litopenaeus vannamei, cultured in oligohaline water (>0.5‰) and in heterotrophic system, were evaluated the effect of adding screens as artificial substrate. Post-larvae with 10 days (PL10) were acclimated from 34‰ to 0.5‰, during 12 days. After of the acclimatization process, the postlarvae (PL22) were reared to obtain 0.3±0.1g of weight and then they were transferred to 18 fiberglass tanks (800 L of net volume) and stocked with 150 PL/tanque. The substrate percentage addition (SPA), represents 100, 150, 200, 250 and 300% of bottom area (1m2) and the control “0” SPA, it was evaluated in completely randomized design, with three replicates. During the culture, were used a 40% crude protein (CP) ration during the first 30 days, andanother with 35% CP during the a 15 days, offered daily at 8, 12 and 17 hrs. After 45 days of culture the survival ranged from 45 to 84%, between treatments with 300% and 100% of substrate, respectively. The shrimp final weight, when related to the length orbit and the time of culture, did not present statistical difference between the SPA (P>0.05). In the ratio length and culture time, the treatment 300% was statistical different in the SPA-0, 200 and 250%. In conclusion, the use of artificial substrate increased the variables weight gain, feed conversion ratio, growth rate and survival when using SPA between 87.8 and 166.7%. / O uso de substratos artificiais na aqüicultura vem sendo utilizado para disponibilizar maior área de cultivo e alimento natural, melhorando a qualidade de água e desempenho do camarão. Objetivando maximizar a sobrevivência, conversão alimentar e peso final do camarão marinho Litopenaeus vannamei, quando cultivado em água oligohalina (>0,5‰) e em meio heterotrófico, foram avaliadas a influência da adição de telas como substrato artificial. Pós-larvas com 10 dias (PL10) foram aclimatadas de 34‰ para 0,5‰, durante um período de 12 dias. Ao final do processo de aclimatação, as pós-larvas (PL22) foram cultivadas até se obter o peso de 0,3+0,1g e, posteriormente, foram transferidas para 18 tanques de fibra de vidro (800L de volume útil) e estocadas com 150 PL/tanque. A porcentagem de adição de substrato (PAS) foi representada por 100, 150, 200, 250 e 300% da área de fundo dos tanques (1,0 m2), e o controle com “0” de PAS, analisadas em delineamento inteiramente casualizado, com três repetições. Durante a fase de cultivo, foi utilizada, nos 30 primeiros dias, ração com40% de proteína bruta (PB) e nos 15 posteriores, com 35% PB, administrada diariamente às 8, 12 e 17 horas. Ao final de 45 dias de cultivo, a sobrevivência variou de 45 a 84%, entre os tratamentos com 300% e 100% de substrato, respectivamente. O peso final dos camarões, quando relacionado ao comprimento orbital e ao tempo de cultivo, não teve diferença estatística entre as PAS (P>0,05). Na relação entre comprimento com o tempo de cultivo, as PAS de 0, 200 e 250% diferenciaram de 300%. Conclui-se que o uso de substrato artificial favorece as variáveis ganho de peso, fator de conversão alimentar, taxa de crescimento diária e sobrevivência quando se utiliza PAS entre 87,8 e 166,7%.

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