http://repositorio.ufc.br/handle/riufc/15 2026-04-20T11:15:50Z 2026-04-20T11:15:50Z Nunes, Alberto Jorge Pinto http://repositorio.ufc.br/handle/riufc/39845 2019-02-21T17:58:37Z 1999-01-01T00:00:00Z

Título: Food and feeding patterns of the southern brown shrimp Penaeus subtilis Perez-Farfante, 1967 (Crustacea, Penaeidae) Autor(es): Nunes, Alberto Jorge Pinto Abstract: Penaeid shrimp farming constitutes the most important aquaculture sector in economic value. In recent years however, the activity has faced slower progress in production despite a rapid intensification of production methods. The description and quantification of the food and feeding patterns of cultured penaeids may improve resource-use efficiency and conserve inputs critical to the sustainability of the activity. -- This thesis investigated the food and feeding patterns of Penaeus subtilis under laboratory-controlled and culture conditions. Video-recording of shrimp feeding behaviours was used to examine food handling efficiency and size selectivity. Shrimp feeding levels in response to food dispersal method were determined through quantitative analysis of stomach contents and stable carbon isotope mass spectrometry. The abundance of polychaetes was used to study the effects of shrimp predation, stocking density and supplemental feeding. Partial integration of data was carried out using STELLA® II. -- Results indicated that Penaeus subtilis feed manipulation was inversely related to food particle size, with large pellets being less preferred than small ones. Within the feed size range examined, shrimp size had no significant effect on handling efficiency. Feed broadcasting was a more effective method in regards to shrimp food intake, resulting in a greater access and a higher consumption of food among the cultured shrimp population, a lower number of empty stomachs and a greater occurrence of feed in P. subtilis diet. Ingestion of food was a function of shrimp body weight. Feeding intensity increased progressively with shrimp size, but inversely in percentage terms. Foregut clearance rates peaked 3 h after food recovery, while the bulk of faeces was produced within 1 h. Polychaete abundance was affected by higher shrimp stocking densities. Artificial feeding promoted higher polychaete levels, although was not capable of alleviating shrimp grazing pressure at increased stocking densities. -- Results indicated that crumbles and broken pellets may be more advantageous in the culture of Penaeus subtilis. Feeds should be broadcast evenly over the culture area and administered regularly at continually reduced amounts. Rations should vary in accordance to estimates of P. subtilis body weight and account for the initial polychaete abundance and shrimp stocking densities. Tipo: Tese

1999-01-01T00:00:00Z Melo, Juliana Barroso de http://repositorio.ufc.br/handle/riufc/17670 2016-06-14T19:56:39Z 2013-01-01T00:00:00Z

Título: O zoneamento ecológico-econômico costeiro como instrumento de planejamento sustentável do uso e ocupação do litoral: análise de complexos hoteleiros no estado do Ceará (Brasil) Autor(es): Melo, Juliana Barroso de Descrição: MELO, J. B. de. O zoneamento ecológico-econômico costeiro como instrumento de planejamento sustentável do uso e ocupação do litoral : análise de complexos hoteleiros no estado do Ceará (Brasil). 2013. 358 f. Tese (Doutorado em Geografia Humana) - Programa de Doctorado Geografia, Planificación Territorial y Gestión Ambiental, Universidade de Barcelona, - ESP. 2013. Tipo: Tese

2013-01-01T00:00:00Z Castelo Branco, Mônica Pimenta de Novaes http://repositorio.ufc.br/handle/riufc/11668 2018-01-12T19:09:50Z 2003-01-01T00:00:00Z

Título: Análise dos sistemas deposicionais e dinâmica costeira do município de Aquiraz, Estado do Ceará, com auxílio de imagens de sensoriamento remoto Autor(es): Castelo Branco, Mônica Pimenta de Novaes Abstract: The coastal area of the Ceará State, Brazil is locally represented by a natural landscape constituted by scarps developed in the Plio-Pleistocenic Barreiras Formation sediments and for extensive sandy deposits of eolian origin. The Barreiras Formation sediments due to lithologic variations, grain size and form, sedimentary structures and interfingering of facies were classified in three classes. The first class refers to the cyclical deposition of the sedimentary F1 and F2 facies described in the section of the profile PA8 in the District of Aquiraz. The F1 facies is characterized by the predominance of quartz pebbles in relation to sandy-clay matrix (orthoconglomerated) associated to channel and cut and fill sedimentary structures. In the F2 facies the matrix overcome in relation to the clasts, and the rock is classified as a diamictite. These coarse rocks facies and related structures are verified in the proximal segment alluvial fans, with alternations of droughts and humid climatic conditions. The second facies class includes the sandy-clay outcrops, of reddish color, massive aspect, with the presence of dispersed quartz grains (diameter > 3 mm) in the rock body. The sedimentation interpretation is related to intermediate portion of alluvial fans. The third class corresponds to the sandy-clay deposits of yellow reddish color and massive aspect that outcrops in plateau surface and in the majority of the cliffs in the districts of Beberibe, Aracati and Icapuí. The deposition was controlled by debris flow currents in semiarid conditions, and is interpreted as distal of the alluvial fans. The Barreiras Formation outcrop along the eastern coast of Ceará State are conditioned by the reactivation of tectonic structures in a neotectonic event. The quaternary sedimentation in the coastal plain of the District of Aquiraz is characterized by beach and aeolian deposits. Aeolian sandy dunes, show varied forms and are classified in active, partially active and inactive, in agreement with their morphologies and vegetable index covering. The cell of the beach face of the point of Iguape is characterized by the presence of extensive field of inactive parabolic dunes. In the cell of the foreshore beach there are a variety of dune types originated by reactivations of tectonic structures and by the processes of sedimentary by passing over the point of Iguape. The face of beach in the coast of Aquiraz is characterized by the dissipative stage (Barro Preto e Batoque beaches) and intermediate stage (Presidio, Prainha and Porto of the Dunes beaches). The amount of sediments involved in the costal dynamics reveals larger values for the areas situated in the beach face of the Iguape rocky point and smaller for the foreshore beach. The images interpretation of remote sensing allowed to discover submerged features in the delta of the Jaguaribe river and along the coastal plain of the District of Icapuí. The tax of migration of the active field dunes positioned in the margin of the Catú lake was calculated starting from the overlapping of aerial photography digitalized and images of the Ikonos - II satellite. The assessment of the variation of the line coast in the district of Aquiraz reveals that the area has been submitted to a small elevation of the relative level of the sea along the 36 last years. By this way the use of satellite images in the coastal researches becomes a tool of vital importance in the process of recognition of the physical processes involved in the coastal dynamics. Descrição: CASTELO BRANCO, M. P. de N. Análise dos sistemas deposicionais e dinâmica costeira do município de Aquiraz, Estado do Ceará, com auxílio de imagens de sensoriamento remoto. 2003, 235 f. Tese (doutorado em Geoprocessamento de Dados Geológicos e Análise Ambiental) - Instituto de Geociências, Universidade de Brasília, Brasília, 2003. Tipo: Tese

2003-01-01T00:00:00Z Maia, Luis Parente http://repositorio.ufc.br/handle/riufc/40 2021-10-04T16:44:27Z 1998-01-01T00:00:00Z

Título: Procesos costeros y balance sedimentario ao lo largo de Fortaleza (NE-Brasil): implicaciones para una gestión adecuada de la zona litoral Autor(es): Maia, Luis Parente Tipo: Tese

1998-01-01T00:00:00Z