Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-11-09T10:53:09Z No. of bitstreams: 1 2016 - Philipe Parreiras Horta de Seixas.pdf: 1628187 bytes, checksum: d31c041a1ff12f0800060ca43a9e61f3 (MD5) / Made available in DSpace on 2017-11-09T10:53:09Z (GMT). No. of bitstreams: 1 2016 - Philipe Parreiras Horta de Seixas.pdf: 1628187 bytes, checksum: d31c041a1ff12f0800060ca43a9e61f3 (MD5) Previous issue date: 2016-08-26 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The purpose of the present study is to improve the techniques in the nutrition of Ucides cordatus larvae, one of the most commercially exploited resources on Brazilian?s mangroves. For such, three experiments were performed, evaluating different diets on Ucides cordatus larval development. The ovigerous females were collected by a professional crab-man, on Barra de Guaratiba mangroves, Rio de Janeiro-RJ, near the hatching period and taken to the Laborat?rio de Cultivo de Algas e Zoopl?ncton (LACAZ) of the Esta??o Experimental de Aquicultura Almirante Paulo Moreira (EEAAPM)/FIPERJ, for spawning. On experiments 1 and 2, the objective was to evaluate the replacement of the live food for a commercial formulated diet for shrimp (Larval Z Plus/Zeigler) on the development of the larvae in the zoea I stage until the megalopa (experiment 1) and from the megalopa stage to juvenile (experiment 2). On experiment 1, after 15 days, the first megalopas occurred in every treatment and the larvae survival was on average 30.1?11.8%, without significant difference between live food, mixed and commercial formulated diet treatments. Also, there was no significant difference in final survival between larvae fed with live food (13.5%), mixed (9.3%), and feed (5.5%). On experiment 2, there was no survival in the treatments whereby larvae were fed only with feed. The first juvenile occurred on the treatment with Artemia nauplii, on the 10th day. The final survival rates with Artemia treatments and mixed were of 33.3% and 8.3%, respectively. According to the chi-square test, the survival was independent of the type of food (Artemia and mixed). On experiment 3, the objetive was to evaluate Ucides cordatus larvae development from zoea I to the megalopa metamorphosis with the microalgae: Rhodomonas sp., Isochrysis galbana and Chaetoceros muelleri. The task was performed on individual cultures with 15 repetitions and semi-static system. First megalopas occurred on the 19th day in all of the treatments. The highest survival rate was observed on the treatment with Rhodomonas sp. (43%) followed by I. galbana (23%) and C. muelleri (13%), presenting significant difference (p>0,05) between only Rhodomonas sp. and C. muelleri treatements. Based on the results displayed, thereby concluded on experiment 1, despite not having been observed significant difference between the treatments, feed diet can be indicated as a more advantageous alternative on larval phases (zoea I to megalopa) by reducing risks and cost with live food production and providing more facility on management. On experiment 2, the diet exclusively with Artemia sp. was the most indicated for megalopa phase by promoting better rates of survival and a faster larval development. On experiment 3, the microalgae species Rhodamonas sp. and Isochrysis galbana were the most indicated ones for larviculture of U. cordatus, being necessary other studies in larger scale conditions in order to confirm this task results / A finalidade do presente estudo foi aprimorar as t?cnicas na alimenta??o de larvas do Ucides cordatus caranguejo-u??, um dos recursos mais explorados comercialmente nos manguezais brasileiros. Para isso, foram realizados tr?s experimentos avaliando diferentes dietas no desenvolvimento larval do caranguejo-u??. As f?meas ov?geras foram coletadas por um caranguejeiro profissional, nos manguezais de Barra de Guaratiba, Rio de Janeiro-RJ, pr?ximo ao per?odo de eclos?o, e levadas ao Laborat?rio de Cultivo de Algas e Zoopl?ncton (LACAZ) da Esta??o Experimental de Aquicultura Almirante Paulo Moreira (EEAAPM)/FIPERJ, para desova. Nos experimentos 1 e 2, o objetivo foi avaliar a substitui??o do alimento vivo por uma dieta formulada comercial para camar?o (Larval Z Plus/Zeigler) no desenvolvimento das larvas do estagio de zoea I at? megalopa (experimento 1) e do est?gio de megalopa para juvenil (experimento 2). No experimento 1, ap?s 15 dias ocorreram as primeiras megalopas em todos os tratamentos e a sobreviv?ncia de larvas durante esse per?odo foi em m?dia 30,1?11,8% sem diferen?a significativa entre os tratamentos alimento vivo, misto e dieta formulada comercial. Tamb?m n?o houve diferen?a significativa na sobreviv?ncia final entre larvas alimentadas com alimento vivo (13,5%), misto (9,3%) e ra??o (5,5%). No experimento 2, n?o houve sobreviv?ncia nos tratamentos em que as larvas foram alimentadas somente com ra??o. O primeiro juvenil ocorreu no tratamento com n?uplios de Artemia, no 10? dia. As taxas finais de sobreviv?ncia com os tratamentos Artemia e misto foram de 33,3% e 8,3% respectivamente. Segundo o teste qui-quadrado, a sobreviv?ncia foi independente do tipo de alimento (Artemia e misto). No experimento 3, o objetivo foi avaliar o desenvolvimento larval do caranguejo-u??, de zoea I at? a metamorfose para megalopa com as microalgas: Rhodomonas sp., Isochrysis galbana e Chaetoceros muelleri. O trabalho foi realizado em cultivos individuais com 15 repeti??es e sistema semi-est?tico. As primeiras megalopas ocorreram no 19? dia em todos os tratamentos. A maior taxa de sobreviv?ncia foi observada no tratamento com Rhodomonas sp. (43%) seguido da I. galbana (23%) e C. muelleri (13%), apresentando diferen?a significativa (p<0,05) somente entre os tratamentos Rhodomonas sp. e C. muelleri. Com base nos resultados apresentados, conclui-se no experimento 1, que apesar de n?o ter sido observada diferen?a significativa entre os tratamentos, a alimenta??o com ra??o pode ser indicada como uma alternativa mais vantajosa nas fases larvais (zoea I at? megalopa) por diminuir os riscos e o custo com a produ??o de alimento vivo e proporcionar maior facilidade no manejo. No experimento 2, a dieta exclusivamente com Artemia sp. foi a mais indicada para a fase de megalopa por promover melhor taxa de sobreviv?ncia e um desenvolvimento larval mais r?pido. No experimento 3, as esp?cies de microalgas Rhodomonas sp e Isochrysis galbana foram as mais indicadas para larvicultura de U. cordatus, sendo necess?rio outros estudos em escalas maiores, para confirmar os resultados deste trabalho