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Registros recuperados: 3
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Multigear fishery of Nile perch (Lates niloticus) in the Winam Gulf of Lake Victoria: with special reference to mortality, selection and catch/effort data OceanDocs
Manyala, J.O.; Rabuor, C.O..
A survey of multigear fishery of Nile perch (Lates niloticus) in the Winam Gulf of Lake Victoria indicates that total mortality coefficient (Z) determined from longline fishery using hook number 6 was double that of hook number 7. Total mortality coefficient determined from gillnets and beachseines were lower than those of hooks. The catch per unit effort (C/f) measured using different criteria indicated an increase for all gears in 1990 as compared to 1989 except for gillnets. A two-fold increase in unit effort (f) increased the C/f for mosquito seines by only 30%. The typical exponential decay of C/f with increasing f of exploited stock in equilibrium was lacking in the case of Nile perch in the Winam Gulf.
Tipo: Proceedings Paper Palavras-chave: Lates niloticus; Catch/effort; Exploitation; Gillnets; Lake fisheries; Gillnets; Lake fisheries; Http://aims.fao.org/aos/agrovoc/c_32431; Http://aims.fao.org/aos/agrovoc/c_4159.
Ano: 1994 URL: http://hdl.handle.net/1834/1174
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Scanning Electron Microscopy of the Gastrointestinal Tract of Nile Perch (Lates niloticus, Linneaus, 1758) International Journal of Morphology
Namulawa,Victoria Tibenda; Kato,Charcles Drago; Nyatia,Edward; Rutaisire,Justus; Britz,Peter.
The morphology of the gastrointestinal tract of adult Nile perch was described using standard SEM procedures. Investigations revealed the presence of cardiform teeth in the oral cavity, goblet cells and finger print-like microridges on the hard palate and oesophagus lumenal surface. Elaborate patterns and bacterial cells were observed on the stomach lumenal surface and intense foldings in the intestinal region. These observations provide a better understanding of the morphology of the gut in Nile perch and how it is suited for its digestive function.
Tipo: Journal article Palavras-chave: Gastrointestinal tract; Lates niloticus; Scanning electron microscopy.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300047
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Suggestions to set mesh size limits and restrict the fishing methods and the types of fishing gears on Lakes Victoria and Kyoga OceanDocs
Ogutu-Ohwayo, R.; Twongo, T.; Wandera, S.B.; Balirwa, J.B..
On the basis of observations, it is recommended that 127 mm should be the minimum mesh size of gillnet permitted on Lakes Victoria and Kyoga. The minimum length of Nile tilapia (Oreochromis niloticus) should remain at 28 cm but that of Nile perch (Lates niloticus) should be increased from 46 cm to 50 cm. The minimum mesh size limit of seine net for Mukene on Lake Victoria should be 10 mm and fishing for Mukene should be done using lampara net operated offshore.
Tipo: Proceedings Paper Palavras-chave: Lates niloticus; Oreochromis niloticus; Rastrineobola argentea Catchability Fishery regulations Mesh selectivity.
Ano: 1994 URL: http://hdl.handle.net/1834/1278
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