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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

The effects of stocking density, amount of substrate, frequency of feeding, and waste removal on nursery production and the effects of substrate height on pond production of freshwater prawn Macrobrachium rosenbergii

Ashby, Alison Aria, January 2003 (has links) (PDF)
Thesis (M.S.)--University of Tennessee, Knoxville, 2003. / Title from title page screen (viewed Mar. 22, 2004). Thesis advisor: J. Larry Wilson. Document formatted into pages (viii, 54 p. : col. ill.). Vita. Includes bibliographical references (p. 50-53).
2

Efeito da intensificação na larvicultura do camarão-da-malásia Macrobrachium rosenbergii /

David, Fernanda Seles. January 2011 (has links)
Resumo: Avaliou-se o efeito da densidade de estocagem na larvicultura de Macrobrachium rosenbergii nas densidades de 50, 70, 80, 90, 100, 120 e 140 larvas/L. Os custos de implantação, de produção e os indicadores econômicos de três larviculturas hipotéticas utilizando densidades de estocagem de 50, 100 e 140 larvas/L foram avaliados. Os resultados obtidos mostram que a intensificação do sistema influenciou as variáveis sobrevivência e produtividade. Nas densidades mais elevadas, os valores de produtividade foram maiores, todavia, a partir de 90 larvas/L o espaço demonstrou-se um fator limitante, afetando a quantidade de indivíduos na população sem comprometer o desenvolvimento das larvas. Na análise econômica, o cultivo na densidade de 140 larvas/L apresentou os melhores indicadores econômicos e suportou melhor as possíveis variações de mercado. No entanto, a densidade de 100 larvas/L apresentou indicadores próximos aos obtidos para 140 larvas/L, maior eficiência na taxa de metamorfose e pode gerar menor nível de estresse nas larvas. Conclui-se que o intervalo de 90 a 100 larvas/L é mais adequado, biológica e economicamente, para a produção de pós-larvas de M. rosenbergii, em sistema fechado dinâmico / Abstract: We evaluated the effect of stocking density on larval rearing of Macrobrachium rosenbergii in stocking densities of 50, 70, 80, 90, 100, 120 and 140 larvae/L. The costs of planting, production and economic indicators using three hypothetical hatcheries stocking densities of 50, 100 and 140 larvae/L were evaluated. The results obtained show that the intensification of the system influences the survival and productivity variables. At higher densities, the productivity values were greater, however, from 90 larvae/L the space proved to be a limiting factor, affecting the amount of individuals in the population without compromising the development of larvae. In economic analysis, the rearing in density of 140 larvae/L showed the best economic indicators and endured the best possible market variations. However, the density of 100 larvae/L showed indicators close to those obtained for 140 larvae/L, more efficient rate of metamorphosis and can lead to lower stress levels in the larvae. We conclude that the range of 90 to 100 larvae/L is more appropriate, biological and economically, to produce post-larvae of M. rosenbergii, in a closed system dynamic / Orientador: Wagner Cotroni Valenti / Coorientador: Alessandra da Silva Augusto / Banca: Margarete Mallasen / Banca: Ricardo Jorge Guerra Calado / Mestre
3

Efeito da intensificação na larvicultura do camarão-da-malásia Macrobrachium rosenbergii

David, Fernanda Seles [UNESP] 16 June 2011 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:22:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-06-16Bitstream added on 2014-06-13T19:27:40Z : No. of bitstreams: 1 david_fs_me_jabo.pdf: 1823187 bytes, checksum: 5487fdb6b27e5848e23858c636cfd1b2 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Avaliou-se o efeito da densidade de estocagem na larvicultura de Macrobrachium rosenbergii nas densidades de 50, 70, 80, 90, 100, 120 e 140 larvas/L. Os custos de implantação, de produção e os indicadores econômicos de três larviculturas hipotéticas utilizando densidades de estocagem de 50, 100 e 140 larvas/L foram avaliados. Os resultados obtidos mostram que a intensificação do sistema influenciou as variáveis sobrevivência e produtividade. Nas densidades mais elevadas, os valores de produtividade foram maiores, todavia, a partir de 90 larvas/L o espaço demonstrou-se um fator limitante, afetando a quantidade de indivíduos na população sem comprometer o desenvolvimento das larvas. Na análise econômica, o cultivo na densidade de 140 larvas/L apresentou os melhores indicadores econômicos e suportou melhor as possíveis variações de mercado. No entanto, a densidade de 100 larvas/L apresentou indicadores próximos aos obtidos para 140 larvas/L, maior eficiência na taxa de metamorfose e pode gerar menor nível de estresse nas larvas. Conclui-se que o intervalo de 90 a 100 larvas/L é mais adequado, biológica e economicamente, para a produção de pós-larvas de M. rosenbergii, em sistema fechado dinâmico / We evaluated the effect of stocking density on larval rearing of Macrobrachium rosenbergii in stocking densities of 50, 70, 80, 90, 100, 120 and 140 larvae/L. The costs of planting, production and economic indicators using three hypothetical hatcheries stocking densities of 50, 100 and 140 larvae/L were evaluated. The results obtained show that the intensification of the system influences the survival and productivity variables. At higher densities, the productivity values were greater, however, from 90 larvae/L the space proved to be a limiting factor, affecting the amount of individuals in the population without compromising the development of larvae. In economic analysis, the rearing in density of 140 larvae/L showed the best economic indicators and endured the best possible market variations. However, the density of 100 larvae/L showed indicators close to those obtained for 140 larvae/L, more efficient rate of metamorphosis and can lead to lower stress levels in the larvae. We conclude that the range of 90 to 100 larvae/L is more appropriate, biological and economically, to produce post-larvae of M. rosenbergii, in a closed system dynamic
4

Desenvolvimento ontogenético de estruturas sensoriais em Macrobrachium rosenbergii (De Man 1879) (Crustacea, Palaemonidae)

Henriques, Virgínia Maria Cavalari [UNESP] 22 June 2006 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:30:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-06-22Bitstream added on 2014-06-13T18:40:45Z : No. of bitstreams: 1 henriques_vmc_dr_jabo.pdf: 21990041 bytes, checksum: 72a1d82d9783cfd7140b55f66e403d2d (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Os crustáceos dispõem de estruturas sensitivas que permitem receber estímulos do meio. Estes são usados para localizar e capturar o alimento. As estruturas de quimiorrecepção e mecanorrecepção são reconhecidas como os principais sentidos usados pelos crustáceos decápodas para identificação de partículas alimentares. O Macrobrachium rosenbergii é uma espécie que passa por uma fase planctônica e outra bentônica, faz grandes migrações a favor ou contra a corrente conforme a fase do ciclo de vida ou estágio fisiológico e muda o hábito alimentar de carnívoro à onívoro. Portanto, deve apresentar mecanismos de percepção dos estímulos do meio, que se modificam ao longo do desenvolvimento. Assim, a hipótese levantada nessa pesquisa foi que M. rosenbergii apresenta estruturas sensitivas na superfície do corpo e apêndices, que se modificam desde a eclosão da larva até a fase adulta. O objetivo deste trabalho foi pesquisar a ocorrência de estruturas sensitivas ao longo do desenvolvimento ontogenético de M. rosenbergii. A pesquisa ocorreu no setor de carcinicultura do CAUNESP. As larvas e pós-larvas foram coletadas de larvicultura sob sistema fechado dinâmico segundo Valenti (1998) e os juvenis e adultos dos sistemas de cultivo do setor. Os animais foram fixados com Karnovsky e dissecados. De cada animal, retiraram-se as antênulas, as antenas, as maxilas, as placas mandibulares, os três maxilípedes e os olhos para possibilitar a observação dos apêndices e as estruturas sensitivas. Os apêndices e olhos foram metalizados e fotodocumentados em microscópio eletrônico de varredura. Os olhos também foram analisados com técnicas de microscopia eletrônica de transmissão e técnica de rotina para análises histológicas segundo Behmer (2003). Identificaram-se setas sensitivas em todos os estágios larvais, pós-larva, juvenil e adulto. Elas distribuem-se em todos... / The crustaceans dispose of sensitive structures that allow them to receiive stimuli from environment. These are used to locate and capture food. Chemoreceprion and mechanoreption are known as the main senses used by the decapod crustaceans to indentify food particles. The Macrobrachium rosenbergii is a species that goes through a planktonic and a benthonic phase performs great migrations against or within the current depending on the life cycle phase or physiological stage and changes its feeding haits from carnivorous to omnivorous. Thus, it should present perception mechanisms of environment stimuli that are modified during development. Therefore, the hypotheisis brought up in this research was that the M. rosenbergii presents sensitive structures on the surface of the body and appendices that change from since the hatching of the larva up to the adult phase. The object of this paper was to research the occurrence of the sensitive structures during the entogenetic development of the M. rosenbergii. The research was performed at the carciniculture sector of the CAUNESP. The larvae and post larvae were collected from larvae culture under a closed dynamic system according to Valenti (1998) and the yong and adult larvae from the cultivating systems of the sector. The animals were set with Karnovsky and dissected. From each animal the antennules, the antennas, the maxillas, the mouthpiece plates, the three maxilipedes and the sensitve structures. The appendices and eyes were metalized and photo documented by way of electronic transmission techniques and rotine techniques for histological analysis according to Behmer (2003). Sencitive setae were identified in all larval stages, post larval, young and adult. They are distributed in all of the dissected appendices with Intense morphological variantions. They present. They present typical morphological pattern of the sensitive setae, with basal... (Complete abstract click electronic access below)
5

Behavioral factors influencing movement, dispersion and mortality in Macrobrachium rosenbergii

Peebles, John Bradbury January 1977 (has links)
Thesis (Ph. D.)--University of Hawaii at Manoa, 1977. / Bibliography: leaves [210]-217. / Microfiche. / xvii, 217 leaves ill
6

The production potential of the giant freshwater prawn, Macrobrachium rosenbergii, in the Eastern Transvaal Lowveld

Taylor, Llewellyn Rupert 10 March 2014 (has links)
M.Sc. (Zoology) / Please refer to full text to view abstract
7

Efeito da composição iônica da água no desenvolvimento de larvas de Macrobrachium rosenbergii (De Man, 1879) no estágio II

Mallasen, Margarete [UNESP] 01 October 1997 (has links) (PDF)
Made available in DSpace on 2016-09-27T13:40:10Z (GMT). No. of bitstreams: 0 Previous issue date: 1997-10-01. Added 1 bitstream(s) on 2016-09-27T13:45:24Z : No. of bitstreams: 1 000027249.pdf: 1097912 bytes, checksum: ff97431a047b903f477cf29318e2eceb (MD5) / O trabalho teve como objetivo avaliar a importância da presença na água dos íons Ca2+, K+, HCO3-, Br-, Sr2+, Mn2+, HPO42-, Li+, MoO42-, S2O32-, Al3+, Rb+, Zn2+, Co2+ e Cu2+ para o desenvolvimento do Macrobrachium rosenbergii no estágio larval II, visando fornecer subsídios para a otimização da composição iônica da água salobra utilizada na larvicultura dessa espécie. A água do mar artificial foi preparada conforme a formulação usada no setor de Carcinicultura do CAUNESP, cujos sais são classificados em macroelementos (MA), microelementos (MI) e elementos traços (ET). Foram realizadas cinco etapas seqüencialmente. Na primeira avaliaram-se águas salobras preparadas com MA + MI + ET, sendo que, em cada tratamento, foi eliminado um dos seguintes elementos traços: alumínio, rubídeo, zinco, cobalto e cobre. Na segunda a água foi preparada com MA + MI e, em cada tratamento adicionou-se um dos elementos traços. Na Fase 3 foram analisadas formulações preparadas com MA + MI, sendo que, em cada tratamento foi eliminado um dos seguintes microelementos: bromo, estrôncio, manganês, fosfato, lítio, molibdato e tiossulfato. Na Fase 4 a água foi preparada com MA e, em cada tratamento, adicionouse um dos microelementos. Na última fase foram avaliados cinco meios preparados com MA + Br-; em cada tratamento foi eliminado um dos seguintes íons: cálcio, potássio, bicarbonato e brometo. Todas as etapas foram realizadas seguindo um delineamento inteiramente casualizado com três repetições (três béqueres) para cada tratamento. Aplicou-se um teste de inanição, que consistiu na estocagem de seis larvas de M. rosenbergii, no estágio larval II, em béqueres de 30 ml, contendo 15 ml de água salobra a 12‰, mantidos em temperatura ambiente em torno de 30ºC. A cada oito horas contou-se o número de larvas vivas em cada unidade experimental, para o cálculo do tempo médio de vida em todos os tratamentos. Os dados foram... / The importance of the ions presence in water Ca2+, K+, HCO3-, Br-, Sr2+, Mn2+, HPO42-, Li+, MoO42-, S2O32-, Al3+, Rb+, Zn2+, Co2+ and Cu2+ on the development of Macrobrachium rosenbergii at the larval stage II was evaluated, in order to obtain information to optimize the ionic composition of the brackish water used to larviculture this species. Artificial sea water was prepared according to the formulation used by the Crustacean Rearing Laboratory of CAUNESP. In this formula, salts are classified in major elements, minor elements and trace elements. In this experiment, a starvation test was applied. It consisted in keeping larvae of M. rosenbergii, at the stage II, in 30 ml beakers containing 15 ml of brackish water (12‰). The beakers were kept at about 30ºC of controlled air temperature. There were five phases conducted sequencially (phases 1 to 5). Brackish water of different ionic composition, in relation to the trace elements Al3+, Rb+, Zn2+, Co2+ and Cu2+, were evaluated on the first two phases. Differents formulas containing the minor elements Br-, Sr2+, Mn2+, HPO42-, Li+, MoO42- and S2O32 were evaluated on phases 3 and 4. And five media with differents ionic composition containing the major elements Ca2+, K+, HCO3-, and the minor element Br-, were evaluated on phase 5. Three beakers were used per treatment, and each was stocked with six larvae, in a complete randomized experimental design. In order to estimate the average life time, the number of larvae that survived the treatment was counted every eight hours. The data were analyzed through ANOVA and the means were compared by the Tukey test. The trace elements Al3+, Rb+, Zn2+, Co2+ and Cu2+ and the minor elements Sr2+, Mn2+, HPO42-, Li+, MoO42- and S2O32 did not allow an increase of the larvae life time at the second larval stage. These ions could, however, become essential to this organism at the other stages, or could show a retardation effect. Sodium thiosulphate must be added
8

Efeito da composição iônica da água no desenvolvimento de larvas de Macrobrachium rosenbergii (De Man, 1879) no estágio II /

Mallasen, Margarete. January 1997 (has links)
Orientador: Wagner Cotroni Valenti / Banca: Annelise Margarete Wernick / Banca: Hélcio Luís de Almeida Marques / Resumo: O trabalho teve como objetivo avaliar a importância da presença na água dos íons Ca2+, K+, HCO3-, Br-, Sr2+, Mn2+, HPO42-, Li+, MoO42-, S2O32-, Al3+, Rb+, Zn2+, Co2+ e Cu2+ para o desenvolvimento do Macrobrachium rosenbergii no estágio larval II, visando fornecer subsídios para a otimização da composição iônica da água salobra utilizada na larvicultura dessa espécie. A água do mar artificial foi preparada conforme a formulação usada no setor de Carcinicultura do CAUNESP, cujos sais são classificados em macroelementos (MA), microelementos (MI) e elementos traços (ET). Foram realizadas cinco etapas seqüencialmente. Na primeira avaliaram-se águas salobras preparadas com MA + MI + ET, sendo que, em cada tratamento, foi eliminado um dos seguintes elementos traços: alumínio, rubídeo, zinco, cobalto e cobre. Na segunda a água foi preparada com MA + MI e, em cada tratamento adicionou-se um dos elementos traços. Na Fase 3 foram analisadas formulações preparadas com MA + MI, sendo que, em cada tratamento foi eliminado um dos seguintes microelementos: bromo, estrôncio, manganês, fosfato, lítio, molibdato e tiossulfato. Na Fase 4 a água foi preparada com MA e, em cada tratamento, adicionouse um dos microelementos. Na última fase foram avaliados cinco meios preparados com MA + Br-; em cada tratamento foi eliminado um dos seguintes íons: cálcio, potássio, bicarbonato e brometo. Todas as etapas foram realizadas seguindo um delineamento inteiramente casualizado com três repetições (três béqueres) para cada tratamento. Aplicou-se um teste de inanição, que consistiu na estocagem de seis larvas de M. rosenbergii, no estágio larval II, em béqueres de 30 ml, contendo 15 ml de água salobra a 12‰, mantidos em temperatura ambiente em torno de 30ºC. A cada oito horas contou-se o número de larvas vivas em cada unidade experimental, para o cálculo do tempo médio de vida em todos os tratamentos. Os dados foram... / Abstract: The importance of the ions presence in water Ca2+, K+, HCO3-, Br-, Sr2+, Mn2+, HPO42-, Li+, MoO42-, S2O32-, Al3+, Rb+, Zn2+, Co2+ and Cu2+ on the development of Macrobrachium rosenbergii at the larval stage II was evaluated, in order to obtain information to optimize the ionic composition of the brackish water used to larviculture this species. Artificial sea water was prepared according to the formulation used by the Crustacean Rearing Laboratory of CAUNESP. In this formula, salts are classified in major elements, minor elements and trace elements. In this experiment, a starvation test was applied. It consisted in keeping larvae of M. rosenbergii, at the stage II, in 30 ml beakers containing 15 ml of brackish water (12‰). The beakers were kept at about 30ºC of controlled air temperature. There were five phases conducted sequencially (phases 1 to 5). Brackish water of different ionic composition, in relation to the trace elements Al3+, Rb+, Zn2+, Co2+ and Cu2+, were evaluated on the first two phases. Differents formulas containing the minor elements Br-, Sr2+, Mn2+, HPO42-, Li+, MoO42- and S2O32 were evaluated on phases 3 and 4. And five media with differents ionic composition containing the major elements Ca2+, K+, HCO3-, and the minor element Br-, were evaluated on phase 5. Three beakers were used per treatment, and each was stocked with six larvae, in a complete randomized experimental design. In order to estimate the average life time, the number of larvae that survived the treatment was counted every eight hours. The data were analyzed through ANOVA and the means were compared by the Tukey test. The trace elements Al3+, Rb+, Zn2+, Co2+ and Cu2+ and the minor elements Sr2+, Mn2+, HPO42-, Li+, MoO42- and S2O32 did not allow an increase of the larvae life time at the second larval stage. These ions could, however, become essential to this organism at the other stages, or could show a retardation effect. Sodium thiosulphate must be added / Mestre
9

Efecto de la densidad de siembra y adición de substrato en el crecimiento y la supervivencia del "camarón gigante de Malasia " Macrobrachium rosenbergii en policultivo con "tilapia roja" Oreochromis niloticus

Maguiña Mendoza, Aryul Arturo January 2007 (has links)
En los últimos años se han desarrollados numerosas investigaciones con el fin de mejorar el cultivo del camarón gigante de Malasia, investigaciones en policultivo, siembra de juveniles graduados y la adición de substrato han dado muy buenos resultados. La mayoría de estas investigaciones han tenido como objetivos la maximización de los niveles de producción, obtener mejoras en los pesos finales e incrementar la resistencia a enfermedades. El objetivo del presente estudio fue evaluar el crecimiento y la supervivencia del camarón gigante de Malasia Macrobrachium rosenbergii con 2 densidades de siembra (D1 y D2) y 2 porcentajes de incremento de substratos (S1 y S2) en policultivo con Oreochromis niloticus tilapia roja. Para alcanzar este objetivo se utilizó un diseño factorial 2 x 2, es decir, se evaluaron 4 tratamientos, 2 niveles por cada uno de los 2 factores (D1S1, D1S2, D2S1 y D2S2), cada tratamiento con tres repeticiones. Los datos de talla, peso, supervivencia y biomasa, obtenidos de las biometrías fueron analizados utilizando el software estadístico Statgrapfhic v.7,0 analizado al 95% de confianza (α es menor que 0,05). Después de 80 días de cultivo se observó que el tratamiento T3 (D2S1) obtuvo los mejores crecimientos (7,05 ± 2,13 g) y los mejores porcentajes de supervivencia (97,5%) para el camarón gigante de malasia. Los dos niveles de adición de substrato fueron igualmente efectivos para el crecimiento del camarón, se encontró una relación inversa entre el incremento de los substratos y los porcentajes de supervivencia. El crecimiento en talla de la tilapia solo fue afectado por la interacción de los factores densidad y substrato donde los tratamientos T2 (D1S2) y T3 (D2S1) presentaron crecimientos significativamente mayores; el crecimiento en peso de la tilapia solo fue afectado por el factor substrato, encontrándose una relación directa; no se encontró diferencia significativa (p es menor que 0,05) para los porcentajes de supervivencia. Se encontró una relación directa entre el incremento de la densidad y la biomasa final del camarón gigante de Malasia, siendo el nivel D2 significativamente mayor que D1. El tratamiento T3 (690,1 Kg ha-1) presentó una biomasa significativamente mayor que T2 (420,9 Kg ha-1) y T1 (387,1 Kg ha-1), T3 y T4 no fueron significativamente diferentes (p es mayor que 0.05). Para la tilapia se encontró una relación directa entre en incremento del substrato y la biomasa final, siendo el nivel S2 significativamente mayor que S1. La biomasa del tratamiento T2 (629,7 Kg ha-1) fue significativamente mayor respecto a T1 (453,4 Kg ha-1). En el análisis de producción los tratamientos T2 y T3 alcanzaron los mejores valores, el análisis de proyección mostró que el policultivo camarón tilapia, con adición de substrato, es una buena alternativa para obtener mejores rendimientos y ganancias. / In recent years, several researches have been developed with the objective of improve the culture of the fresh water prawn Macrobrachium rosenbergii, for instance polyculture, size grading juveniles and adding artificial substrate to the ponds have achieve results, in addition the majority of those investigations in the fresh water prawn have had different objectives, such as increasing the productions levels, increasing the harvest weight and increasing the resistance of different illnesses. This study was designed to evaluate the growth and supervivence of the freshwater prawn Macrobrachium rosenbergii with 2 different densities (D1 y D2) and 2 percentages of added substrates (S1 y S2) in polyculture with Oreochromis niloticus “red tilapia”. In order to achieve this objective, the experiment was designed such as 2 x 2 factorial arrangement consisting in 4 treatment combinations with 2 levels for each of 2 factors (D1S1, D1S2, D2S1 y D2S2) and which 3 replicate for each treatment. The size, supervivence and total production obtained from biometries were analyzed using the software Statgrapfhic v.7,0 at 95 % confidence (α =0,05). After 80 days of culture, T3 (D2S1) treatment had the best weight (7,05 ± 2,13g) and percentage of supervivence (97,5%) to freshwater prawn, in addition the different levels of substrates had similar effect on the harvest weight of freshwater prawn, moreover an inverse relation was found between added substrate and percentage of supervivence. The body length of tilapia was only affected by density and substrate interaction, where T2 and T3 treatment had the best growth. The harvest weight of tilapia was only affected by the substrate and a direct relation was found between them. A significantly effect (p is less than0,05) was not found between the different percentages of supervivence. A direct relation was found between density and total production of the freshwater prawn, where D2 obtained better results than D1. T3 treatment (690,1 kg ha-1) had better yield than T2 (420,9 kg ha-1) and T1 (387,1 kg ha-1), T3 and T4 were not different. Tilapia had a direct relation between added substrate and total production, where S2 was significantly higher than S1. The production from T2 treatment (629,7 kg ha-1) was significantly higher than T1 (453,4 kg ha-1). The production analysis showed that polyculture of prawn-tilapia with added substrate, is a good alternative in order to obtain best productions and weights. / In recent years, several researches have been developed with the objective of improve the culture of the fresh water prawn Macrobrachium rosenbergii, for instance polyculture, size grading juveniles and adding artificial substrate to the ponds have achieve results, in addition the majority of those investigations in the fresh water prawn have had different objectives, such as increasing the productions levels, increasing the harvest weight and increasing the resistance of different illnesses. This study was designed to evaluate the growth and supervivence of the freshwater prawn Macrobrachium rosenbergii with 2 different densities (D1 y D2) and 2 percentages of added substrates (S1 y S2) in polyculture with Oreochromis niloticus “red tilapia”. In order to achieve this objective, the experiment was designed such as 2 x 2 factorial arrangement consisting in 4 treatment combinations with 2 levels for each of 2 factors (D1S1, D1S2, D2S1 y D2S2) and which 3 replicate for each treatment. The size, supervivence and total production obtained from biometries were analyzed using the software Statgrapfhic v.7,0 at 95 % confidence ( =0,05). After 80 days of culture, T3 (D2S1) treatment had the best weight (7,05 ± 2,13g) and percentage of supervivence (97,5%) to freshwater prawn, in addition the different levels of substrates had similar effect on the harvest weight of freshwater prawn, moreover an inverse relation was found between added substrate and percentage of supervivence. The body length of tilapia was only affected by density and substrate interaction, where T2 and T3 treatment had the best growth. The harvest weight of tilapia was only affected by the substrate and a direct relation was found between them. A significantly effect (p<0,05) was not found between the different percentages of supervivence. A direct relation was found between density and total production of the freshwater prawn, where D2 obtained better results than D1. T3 treatment (690,1 kg ha-1) had better yield than T2 (420,9 kg ha-1) and T1 (387,1 kg ha-1), T3 and T4 were not different. Tilapia had a direct relation between added substrate and total production, where S2 was significantly higher than S1. The production from T2 treatment (629,7 kg ha-1) was significantly higher than T1 (453,4 kg ha-1). The production analysis showed that polyculture of prawn-tilapia with added substrate, is a good alternative in order to obtain best productions and weights. / Tesis
10

Desenvolvimento ontogenético de estruturas sensoriais em Macrobrachium rosenbergii (De Man 1879) (Crustacea, Palaemonidae) /

Henriques, Virgínia Maria Cavalari. January 2006 (has links)
Orientador: Wagner Cotroni Valenti / Banca: Laura Satiko Okada Nakaghi / Banca: Irene Bastos Franceschini Vicentini / Banca: Helenice Pereira de barros / Banca: Roberto Munehisa Shimizy / Resumo: Os crustáceos dispõem de estruturas sensitivas que permitem receber estímulos do meio. Estes são usados para localizar e capturar o alimento. As estruturas de quimiorrecepção e mecanorrecepção são reconhecidas como os principais sentidos usados pelos crustáceos decápodas para identificação de partículas alimentares. O Macrobrachium rosenbergii é uma espécie que passa por uma fase planctônica e outra bentônica, faz grandes migrações a favor ou contra a corrente conforme a fase do ciclo de vida ou estágio fisiológico e muda o hábito alimentar de carnívoro à onívoro. Portanto, deve apresentar mecanismos de percepção dos estímulos do meio, que se modificam ao longo do desenvolvimento. Assim, a hipótese levantada nessa pesquisa foi que M. rosenbergii apresenta estruturas sensitivas na superfície do corpo e apêndices, que se modificam desde a eclosão da larva até a fase adulta. O objetivo deste trabalho foi pesquisar a ocorrência de estruturas sensitivas ao longo do desenvolvimento ontogenético de M. rosenbergii. A pesquisa ocorreu no setor de carcinicultura do CAUNESP. As larvas e pós-larvas foram coletadas de larvicultura sob sistema fechado dinâmico segundo Valenti (1998) e os juvenis e adultos dos sistemas de cultivo do setor. Os animais foram fixados com Karnovsky e dissecados. De cada animal, retiraram-se as antênulas, as antenas, as maxilas, as placas mandibulares, os três maxilípedes e os olhos para possibilitar a observação dos apêndices e as estruturas sensitivas. Os apêndices e olhos foram metalizados e fotodocumentados em microscópio eletrônico de varredura. Os olhos também foram analisados com técnicas de microscopia eletrônica de transmissão e técnica de rotina para análises histológicas segundo Behmer (2003). Identificaram-se setas sensitivas em todos os estágios larvais, pós-larva, juvenil e adulto. Elas distribuem-se em todos... (resumo completo, clicar acesso eletrônico abaixo) / Abstract: The crustaceans dispose of sensitive structures that allow them to receiive stimuli from environment. These are used to locate and capture food. Chemoreceprion and mechanoreption are known as the main senses used by the decapod crustaceans to indentify food particles. The Macrobrachium rosenbergii is a species that goes through a planktonic and a benthonic phase performs great migrations against or within the current depending on the life cycle phase or physiological stage and changes its feeding haits from carnivorous to omnivorous. Thus, it should present perception mechanisms of environment stimuli that are modified during development. Therefore, the hypotheisis brought up in this research was that the M. rosenbergii presents sensitive structures on the surface of the body and appendices that change from since the hatching of the larva up to the adult phase. The object of this paper was to research the occurrence of the sensitive structures during the entogenetic development of the M. rosenbergii. The research was performed at the carciniculture sector of the CAUNESP. The larvae and post larvae were collected from larvae culture under a closed dynamic system according to Valenti (1998) and the yong and adult larvae from the cultivating systems of the sector. The animals were set with Karnovsky and dissected. From each animal the antennules, the antennas, the maxillas, the mouthpiece plates, the three maxilipedes and the sensitve structures. The appendices and eyes were metalized and photo documented by way of electronic transmission techniques and rotine techniques for histological analysis according to Behmer (2003). Sencitive setae were identified in all larval stages, post larval, young and adult. They are distributed in all of the dissected appendices with Intense morphological variantions. They present. They present typical morphological pattern of the sensitive setae, with basal... (Complete abstract click electronic access below) / Doutor

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