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Para a condução de um Programa de Melhoramento Genético de Tilápias, há a necessidade de estabelecer os critérios de seleção para que se possa estimar de forma adequada e aplicada os componentes de variância e herdabilidades, no caso do Programa de Melhoramento Genético da Linhagem TILAMAX, estabelecido na Universidade Estadual de Maringá, desde 2005, os componentes de variância para ganho de peso diário (GPD) foram estimados para tilápias do Nilo criadas em tanques-rede ao longo de doze gerações (G1--G12) de seleção em um programa de melhoramento no Brasil. O DWG foi medido cerca de 25.000 acumulados animais marcados representando mais de 700 famílias de irmãos completos e meio-irmãos de tilápia do Nilo sob criação em gaiolas. A variância genética aditiva mostrou uma pequena variação (0,051- 0,066), e as estimativas de herdabilidade variaram de 0,20 a 0,33. O efeito ambiental comum foi responsável por uma proporção maior da variância total em DWG, especialmente nas últimas gerações (6%--24%). Uma tendência genética baseada em todos os dados disponíveis mostrou um aumento substancial no DWG (cerca de 3,3% por geração) de tilápia do Nilo em doze gerações de seleção. Além disso, nossos resultados demonstram ampla margem para melhoramento genético para ganho de peso e, pelo menos mais cinco características de interesse, por ainda várias gerações, pois os dados demonstram que há variabilidade genética suficiente e o controle da endogamia tem sido muito eficiente até o presente momento. [ABSTRACT FROM AUTHOR]

The necessity of new technologies for the culture of aquatic organisms is becoming more evident, and thus, the biofloc system, a technic created to perform zero or minimum water exchange, starts to become more useful not only in shrimp culture, but also in finfish culture. This research purpose was to evaluate the growth and survival of Nile tilapia or gray (Oreochromis niloticus - GIFT strain) and red tilapia Red Florida strain (Oreochromis sp.) in biofloc system stocked in different densities (400 e 800/³) in brackish water (8‰). Sixteen 26L plastic bins (19L usefull) were used and 192 fingerlings (3,06 ± 0,2 g) were stocked. A factorial experimental design was adopted (strain vs density) and a macrocosm-microcosm device system. For 42 days, the animals were fed on a 45% of crude protein commercial diet, three times per day. Water quality parameters and microbial community were monitored. At the end, proximate analysis of biofloc biomass was performed. The results suggested that Nile tilapia was the most appropriate for this phase (3-20 g) in biofloc system in brackish water. Furthermore, no negative effect was observed when 800 fish/³ stocking density was considered. [ABSTRACT FROM AUTHOR]

Copyright of Inventum. Ingenieria, Tecnologia e Investigacion is the property of Corporacion Universitaria Minuto de Dios and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Archivos de Zootecnia is the property of Archivos de Zootecnia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Archivos de Zootecnia is the property of Archivos de Zootecnia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista de la Facultad de Medicina Veterinaria y de Zootecnia is the property of Revista de la Facultad de Medicina Veterinaria y de Zootecnia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

After considering the meaning of tilapia in the national piscicultural scenario, the possibility of improving production rates is a technical imperative and, among these, focusing experimental efforts in the seed turns out to be a strategic option. In order to establish a base model, individual laying of 50 female red tilapia (Oreochromis spp.) were used to determine the content of protein in eggs (% MS), ether extract (% DM), energy (cal g-1) and fatty acid profiles (%) with some relations of analytical interest. Except for minor variations, the values found are consistent with the available records for the species in different studies, suggesting that diets offered to experimental breeders contain the minimum necessary to ensure provision of sufficient energy and nutrients for embryos and larvae in formation. It is analyzed that, as a starting point, this series of data is useful for the development of work to improve the standards of fingerling production, considering that variations in the composition, which can be determined on the eggs, can be used and have validity as a direct indication of its quality. [ABSTRACT FROM AUTHOR]

Copyright of Archivos de Zootecnia is the property of Archivos de Zootecnia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Archivos de Zootecnia is the property of Archivos de Zootecnia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Archivos de Zootecnia is the property of Archivos de Zootecnia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Cientifica de la Facultade de Veterinaria is the property of Universidad del Zulia, Facultad de Ciencias Veterinarias and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)