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| Jiddawi, N.S.; Mwangamilo, J.J.. |
| A study was conducted to find a suitable diet and feeding level for the culture of milkfish (Chanos chanos) in Zanzibar. Two growth trials and one digestibility trial were done. The first growth trial was conducted using 25, 32 and 40% protein diets to determine the optimal level that could be used for the second growth trial on feeding levels. There were no significant differences on feed intake and growth performance of milkfish among the treatments (P<0.896). Body composition analysis showed that fish had more fat (lipid) when fed 32 than 25 and 40% protein diets. The digestibility of protein increased with increasing protein levels: it was 87.3, 92 and 93% respectively. There were no significant differences among the diets (P<0.291). The 32%... |
| Tipo: Journal Contribution |
Palavras-chave: Milkfish culture. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/962 |
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| Jiddawi, N.S.; Öhman, M.C.. |
| Fishery resources are a vital source of food and make valuableeconomic contributions to the local communities involved in fisheryactivities along the 850 km stretch of the Tanzania coastline andnumerous islands. Small-scale artisanal fishery accounts for themajority of fish catch produced by more than 43000 fishermen in thecountry, mainly operating in shallow waters within the continental shelf,using traditional fishing vessels including small boats, dhows, canoes,outrigger canoes and dinghys. Various fishing techniques are appliedusing uncomplicated passive fishing gears such as basket traps, fencetraps, nets as well as different hook and line techniques. Species com-position and size of the fish varies with gear type and location. Morethan 500 species of... |
| Tipo: Journal Contribution |
Palavras-chave: Marine fisheries. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/754 |
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| Amir, O.A.; Jiddawi, N.S.; Berggren, P.. |
| Incidental catches (bycatch) in gillnet fisheries off Zanzibar (Unguja Island), as a source of mortality among several species of dolphins, were reported in a questionnaire survey conducted in 1999. As a follow-up to that survey, from January 2000 to August 2003, we monitored the incidental catches of dolphins collected from 12 fish landing sites. Six species of dolphins were recorded from 143 specimens retrieved from bycatches in drift- and bottom set gillnets. Of these, 68 (48%) were Indo-Pacific bottlenose dolphins (Tursiops aduncus), 44 (31%) spinner dolphins (Stenella longirostris), 12 (8%) Risso’s dolphins (Grampus griseus), 11 (8%) Indo-Pacific humpback dolphins (Sousa chinensis), 6 (4%) Pan-tropical spotted dolphins (Stenella attenuata) and 2 (1%)... |
| Tipo: Journal Contribution |
Palavras-chave: By catch; Distribution; Gillnets; Distribution; Http://aims.fao.org/aos/agrovoc/c_35773. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1136 |
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| Jiddawi, N.S.; Stanley, R.D.; Kronlund, A.R.. |
| We examined the sampling effort required to estimate annual fishery landing statistics from the artisanal fishery. Using the observed variability among landing days in two villages in Zanzibar, Tanzania, we are able to present the relationship between predicted precision and sampling effort and take advantage of the strong correlation between lunar day and landings to demonstrate a potential gain in sampling efficiency of 30 % from stratification. The observed data are then used to simulate a 'virtual' year of landings for the two villages and demonstrate how the simulated year of observations can be used to simulate and assess various sampling strategies. In addition, it provides a heuristic tool for demonstrating the likelihood of how much anyone sampled... |
| Tipo: Journal Contribution |
Palavras-chave: Catch data Artisanal fisheries Coral reefs Fishery statistics ISW; Tanzania. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/23 |
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| Amir, O.A.; Berggren, P.; Jiddawi, N.S.. |
| The level of incidental catches of dolphins in artisanal gillnet fisheries was investigated in a questionnaire survey of 101 gillnet vessel operators from 10 villages in Unguja island of Zanzibar, representing half of all the gillnet fishing fleet in 1999. A total of 96 dolphins were reported to have been incidentally caught between 1995 and 1999; 43 Indo-Pacific bottlenose dolphins (Tursiops aduncus), 29 spinner dolphins (Stenella longirostris), 5 lndo-Pacific humpback dolphins (Sousa chinensis) and 19 unidentified dolphins. Most of these incidental catches (46) were reported in 1999. We extrapolate that 93 animals may have been incidentally caught by the entire fishing fleet (201 vessels) during 1999. This estimate represents a serious cause for concern,... |
| Tipo: Journal Contribution |
Palavras-chave: By-catch Gillnet Marine fisheries ISW; Zanzibar; Tanzania. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/37 |
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