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| Registros recuperados: 235 | |
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| McClanahan, T.R.. |
| In the central Pacific and western Australia the coral-eating snail Drupella cornus has been reported to exhibit large population increases or 'outbreaks' (>10 snails/m2) that result in the loss or devastation of their coral prey. In Kenya, a large population increase of Drupella cornus was recorded from the early 1990's where D. cornus increased from a rare species in the mid 1980's to among the most common prosobranch snail by 1995 (~0.2 snails/m2). Population increases were most commonly observed in a section of reef that had experienced heavy fishing and loss of the durophagous predators such as triggerfish, but still maintained a high abundance of the branching coral Porites nigrescens. In unfished reefs, the population increases of D. cornus were... |
| Tipo: Proceedings Paper |
Palavras-chave: Coral reefs. |
| Ano: 1997 |
URL: http://hdl.handle.net/1834/634 |
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| The original IOTC database was developed in Microsoft Access, a desktop DBMS. As the size and number of simultaneous users connected to the database grew, it became obvious that it was necessary to shift the database to a Client/Server system, capable of attending high-load requests from concurrent users over a network. In addition, during the normal use of the database several limitations of the original design were detected, particularly in terms of framework rigidity. To address these problems, a new design based on the Client/Server paradigm was implemented. This document describes the new design, and discusses the concepts and objectives on which the new design was based. The new data base design was implemented on Microsoft SQL server and is... |
| Tipo: Proceedings Paper |
Palavras-chave: Information systems. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/842 |
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| 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 |
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| Romanov, E.V.. |
| The yield of associated and dependent species taken as bycatch by the purse seine tuna fishery from the Indian Ocean pelagic ecosystem is estimated from data collected by scientific observers aboard Soviet purse seiners in the Western Indian Ocean (WIO), 1986-1992. A total of 494 sets on free swimming schools, whale shark associated schools, whale associated schools, and log associated schools were analyzed. More than 40 fish species and other marine animals were registered. Among them only two species, yellowfin and skipjack tunas, are target species. Average levels of non-tuna bycatch equal 0.518 t per set, 27.2 t for 1,000 t of target species. By the author’s estimates, the annual catch of yellowfin and skipjack tunas in 1990-1995 of the total... |
| Tipo: Proceedings Paper |
Palavras-chave: Tuna fisheries By-catch Purse seining ISW; Indian Ocean. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/45 |
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| Civera Cerecedo, R.; Villareal, H.; Gaxiola Cortes, G.; Jaime Ceballos, B.; García Galano, T.. |
| En los laboratorios de producción de postlarvas de camarón se suministra, en los estadios de protozoea y mysis, alimento vivo para garantizar buenos resultados en el cultivo sin embargo, el empleo de alimentos artificiales posibilita reducir la costosa dependencia de las algas y los quistes de Artemia ( Wouters et al, 2004). Aunque los resultados alcanzados con diferentes dietas artificiales en el cultivo larval son satisfactorios, aún existe gran preferencia por la utilización del alimento vivo. Sin embargo, en los últimos años con vistas a disminuir los costos de producción, la contaminación y agilizar el proceso productivo, diferentes empresas se han dado a la producción de alimentos artificiales para sustituir parcial (Fegan, 1992) o totalmente el... |
| Tipo: Proceedings Paper |
Palavras-chave: Shrimp culture; Aquaculture; Balanced diets; Algae; Crustacean larvae; Aquaculture. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1913 |
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| Chang, S.K.; Liu, H.C.. |
| There were about 341 deep-sea longliners operating in the Indian Ocean (small longliners operating in the northeast Indian Ocean were not included) in 1999, about the same level to 1998. The total catch made by these longliners was roughly estimated as 99,000 MT, a decrease of about 11,000 MT from 1998. The drop of yellowfin tuna by 5,700 MT was the main cause, followed by decreases of bigeye tuna by 2,600 MT and swordfish by 2,100 MT. This decrease in catch might be due to the unfavorable fishing condition around the traditional fishing grounds in the Indian Ocean. In general, the total catch of tunas and billfishes was around 93,000-110,000 MT from 1992 to the present except the relatively high catch in 1993. 'Research Group' Overseas Fisheries... |
| Tipo: Proceedings Paper |
Palavras-chave: Catch statistics Tuna fisheries Longlining Catching method ISW; Indian Ocean. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/72 |
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| Raini, Jackson A.. |
| Routine in situ and laboratory measurements of pH, Conductivity, DO, temperature, alkalinity, salinity, TSS, TDS, Secchi depth and nutrient levels have been carried out at 13 sampling sites in Lake Nakuru (Kenya), influent streams and urban effluent since 1993. Mean values for 8 lake sampling sites are: pH (10.14), Temperature (27.3°C), Conductivity (38.8mS/Cm), DO (9.21mg/l, 83% saturation), Secchi depth (10.3Cm). Mid-lake sampling at 19 sites showed the presence of a thermocline of upto 4 °C gradient (surface to bottom). DO levels (>2m/l) remained within the tolerance thresholds for A. fusiformis and the fish (S. grahami). Trace metal concentrations in Lake Nakuru water and sediment as determined by X-ray fluorescence spectroscopy, varied over an... |
| Tipo: Proceedings Paper |
Palavras-chave: Water quality; Biodiversity; Water levels (lakes). |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/2071 |
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| Abuodha, P.A.W.; Fondo, E.. |
| The Kenya coastline extends from 40 4's to 4041's from Kiunga in the North coast to Vanga in the South, wich is a distance of ca 575km. The coastal areas of Kenya are known to be rich and extremely valuable as they concentrate a rich diversity of natural habitats and a large variety of natural resources. Coastal communities have from time immemorial depended on the exploitation of these resources for commerce and industry. Alongs this coastline, mangroves are common feature in delta, creeks, protected bays, island and river estuaries. |
| Tipo: Proceedings Paper |
Palavras-chave: Mangroves; Coastal zone management. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/292 |
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| Naim, M.M.; Monir, A.A.. |
| Desalination is characterized by rapidly evolving technologies. These technologies are divided mainly into thermal and membrane processes. Thermal processes, however, have numerous limitations, which include intensive use of energy and corrosion problems while membrane processes suffer from membrane fouling and high membrane cost and other problems. Liquid membrane (LMs), on the other hand, which have been discovered in 1968 by Li have no pores to be blocked and cannot be fouled like solid membranes. They also exhibit higher permeabilities and higher selectivities than solid membranes. However, their main problem is the method of containing the liquid between the two miscible but separated donor phase (DP) and receptor phase (RP). LM techniques include... |
| Tipo: Proceedings Paper |
Palavras-chave: Desalination; Liquid membrane Environments Desalination Environment. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1209 |
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| Abban, E.K.; Asante, A.K.; Falk, T.M.. |
| Ghana is one of the countries bordering theAtlantic Ocean on the coast of Africa. The country is located between latitudes 5" N and11" N and longitudes 1" E and 3" W Thecoastline of Ghana, approximately 550 kmlong, is dotted with about 50 lagoons andestuaries that, together with rocky capes and avariety of sandy bays, constitute its coastalwetlands (Armah 1993). These lagoons,estuaries and associated floodplains providehabitats for a variety of wildlife including birdsand fishes (Ntiamoa-Baidu 1991). With an estimated 40 000 ha surface area, the lagoonsare important fish and fisheries resources forassociated communities. The fish speciescomposition of these lagoons varies slightly,but a constant and predominant species is theblack-chinned tilapia,... |
| Tipo: Proceedings Paper |
Palavras-chave: Fish species; Stock assessment. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/698 |
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| Registros recuperados: 235 | |
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