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	Provedor de dados OceanDocs (2) Autor Mamboya, F.A. (2) Björk, M. (1) Dubi, A.M. (1) Mmochi, A.J. (1) Mtolera, M.S.P. (1) Mwandya, A.W. (1) Pratap, H.B. (1) Mais... Palavra-chave Algae (1) Copper (1) Marine aquaculture Water quality Nutrients Dissolved oxygen Eutrophication Fish culture Fish feed Shellfish culture Seaweed culture Biofiltration Environmental pollution ISW (1) Tanzania (1) Tipo do documento Journal Contribution (1) Proceedings Paper (1) Ano 2002 (1) 1999 (1) País Belgium (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última The effect of copper on the daily growth rate and photosynthetic efficiency of the brown macroalga Padina boergesenii OceanDocs Pratap, H.B.; Mamboya, F.A.; Mtolera, M.S.P.; Björk, M.. The effect of copper (Cu) on the daily growth rate (DGR) and photosynthetic efficiency (PE) of the brown macroalga Padina boergesenii was studied under controlled laboratory conditions. The DGR was measured as an increase in fresh weight while the PE was measured as the ratio of variable to maximal chlorophyll fluorescence (Fv/Fm). Padina boegesenii were exposed to 25, 50, 100 and 500mg Cu/l for 21 days. The DGR and PE of P. boergesenii decreased significantly with an increase in copper concentration in the growth media. This study shows that copper is acutely toxic to P. boergesenii at concentrations higher than 500mg Cu/l. Low concentration of copper is toxic to P. boergesenii after a prolonged exposure of 21 days. Similarly, exposure time has a... Tipo: Proceedings Paper Palavras-chave: Copper; Algae. Ano: 1999 URL: http://hdl.handle.net/1834/787 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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