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	Provedor de dados OceanDocs (2) Autor Dubi, A.M. (2) Mamboya, F.A. (1) Mmochi, A.J. (1) Mwandya, A.W. (1) Sanga, I.P.L. (1) Palavra-chave Channels (1) Dredging (1) Marine aquaculture Water quality Nutrients Dissolved oxygen Eutrophication Fish culture Fish feed Shellfish culture Seaweed culture Biofiltration Environmental pollution ISW (1) Safety regulations (1) Sediment deposition (1) Tanzania (1) Mais... Tipo do documento Journal Contribution (2) Ano 2004 (1) 2002 (1) País Belgium (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Impact of improvement of the entrance channel on the rate of sediment deposition into the Dar es Salaam Harbour OceanDocs Dubi, A.M.; Sanga, I.P.L.. The study reported here sought to investigate the effect that the dredging of the harbour basins and the entrance channel has had on sediment deposition rate into the Dar es Salaam harbour. Echo-sounding was carried out along berths No 2, 3, 4, 6, 7 and 8 as a means of detecting changes to their bathymetry in the four years since 1998, when the dredging commenced. Concentrations of transported sediments into and out of the harbour were determined using sediment traps. Short-term measurement of waves and currents were also carried out. Sediment traps, a wave-gauge and a current-meter were deployed in the entrance channel during the South East and North East monsoon seasons respectively. Our results reveal that the sedimentation rates after improvement of... Tipo: Journal Contribution Palavras-chave: Safety regulations; Sediment deposition; Channels; Dredging. Ano: 2004 URL: http://hdl.handle.net/1834/1108 Effects of Fish Culture on Water Quality of an Integrated Mariculture Pond System. OceanDocs Mmochi, A.J.; Dubi, A.M.; Mamboya, F.A.; Mwandya, A.W.. Six mariculture ponds were flooded with seawater since 1996. During this time the ponds were stocked with finfish (milkfish and rabbitfish), which were fed on locally produced fish feed. Some water quality parameters such as temperature, salinity and oxygen saturation were measured twice a day for three years (1998-2000), while nutrient concentrations were measured weekly for one year. Both nutrient concentration and oxygen saturation levels have shown a trend indicating eutrophication. Oxygen concentration changed from an average of 7.16 mg/l in October 1998 to 2.2 mg/l in March 2000 with a negative linear regression of 0.69 during the morning hours. From August 1998 to April 1999 dissolved inorganic ammonia concentration increased by 9 µg-at NIl, from... Tipo: Journal Contribution Palavras-chave: Marine aquaculture Water quality Nutrients Dissolved oxygen Eutrophication Fish culture Fish feed Shellfish culture Seaweed culture Biofiltration Environmental pollution ISW; Tanzania. Ano: 2002 URL: http://hdl.handle.net/1834/26 Registros recuperados: 2 Primeira ... 1 ... Última

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