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| Chande, A.I.; Mgaya, Y.D.. |
| Production, habitat preference and distribution of the blue swimming crab, Portunus pelagicus and the diversity of portunid crabs were studied along the Dar es Salaam coastline, Tanzania. Samples were obtained from beach seine nettings and basket traps. The samples from basket traps were used in habitat preference studies only. The production of Portunus pelagicus was assessed in terms of catch rate and biomass, and the biomass and contribution of recruits to the stock estimated using the Leslie method. Seasonal variations in catch rate were found, with peaks between December and May. The highest catch rate was recorded at Msasani Bay (2.24 kg/haul/100-m net), and the lowest at Mzinga Creek (1.08 kg/haul/100-m net). The harvestable biomass for Dar es... |
| Tipo: Journal Contribution |
Palavras-chave: Portunid crabs; Species diversity; Habitat preference; Crab culture. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/948 |
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| Mgaya, Y.D.; Teikwa, E.D.. |
| The coastal waters of Bagamoyo in Tanzania constitute an important penaeid prawn trawling ground. Despite the high economic value attached to this resource, the biological information necessary for its sustainable exploitation is scanty and fragmented. The present study was therefore designed to investigate the species composition, population abundance and reproduction of the penaeid prawns in Bagamoyo coastal and nearshore waters. Samples were obtained monthly for a period of one year from inshore waters adjacent to the Ruvu Estuary while additional samples were bought at the beach from artisanal fishermen. In the laboratory, samples were identified to the species level. Four penaeid species, Fenneropenaeus indicus (formerly known as Penaeus indicus... |
| Tipo: Journal Contribution |
Palavras-chave: Prawn culture. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/960 |
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| Mgaya, Y.D.; Chande, A.I.. |
| The food habits of the blue swimming crab Portunus pelagicus were investigated using the stomachs of 3948 crabs collected from Kunduchi sub-littoral shallow waters, Msasani Bay and Mzinga creek along the coast of Dar es Salaam. The main food items included mollusks (51.3%), crustaceans (24.1%), fish bones (18%) and unidentified food items (6.6%). The dominant food item was the bivalve Arcuatula arcuatula Hanley, 1844. Other molluscs included the gastropod genera Nassarius, Littoraria and Conus sp. There was no significant difference in the frequency of occurrence of food items among sexes and sizes of P. pelagicus, or according to season. There were, however, significant differences between the different food items and the frequency of their occurrence in... |
| Tipo: Journal Contribution |
Palavras-chave: Portunus pelagicus; Arcuatula arcuatula; Nassarius Littoraria; Conus Crab fisheries Fish. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1090 |
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