-
Stocking Density, Length-Weight Relationship and the Condition of Nile Tilapia in Valley Dam Based Floating Cages in Semi-Arid Karamoja Sub-Region of Uganda
Constantine Chobet Ondhoro,
Moses Ndugwa,
Paul Boma,
Charles Byaruhanga,
George Egau,
Paul Okullo
Issue:
Volume 4, Issue 2, March 2019
Pages:
35-41
Received:
27 February 2019
Accepted:
3 April 2019
Published:
17 May 2019
Abstract: Biological indices; length-weight relationship and fish condition are tools for design of husbandry practices and developing policies for fish farming in natural and artificial water systems. We investigated the effects of fish stocking density treatments; A (100), B (150), C (200) and D (250) fishm-3 on growth and well-being of Nile tilapia, reared in floating cages at Arechek valley dam located in Napak District, Karamoja-Uganda. Length-weight relationship and relative condition factor were computed for each treatment and the resultant outputs compared using univariate ANOVA, and regression analyses. Final fish weights (±Stdev) in different treatments were 311.49±114.6, 204.8±30.5, 138±40.2 and 153.3±68.8g while the mean total lengths were 23.29±2.55 cm, 17.5±5.5, 15.6±15.6 and 19.4±3.02 cm, in A, B, C and D respectively. The length-weight allometry was significantly (P<0.05) different among treatments, (F(5, 1081) = 3.102). Mean relative conditions (Kn) were (±Stdev) 1.08±0.08, 1.91±0.13, 0.79±0.08 and 0.65±0.08 in A, B, C and D respectively, and these were significantly different (P<0.05). Water quality parameters did not influence fish growth and Kn, F(4, 59) = 1.849, P>0.05, R2 = 0.111). The variation in condition was mainly due to stocking density (P<0.05). The most appropriate stocking density of Nile tilapia in valley dam using 35% C. P sinking feed is 100-150 fishm-3 of cage.
Abstract: Biological indices; length-weight relationship and fish condition are tools for design of husbandry practices and developing policies for fish farming in natural and artificial water systems. We investigated the effects of fish stocking density treatments; A (100), B (150), C (200) and D (250) fishm-3 on growth and well-being of Nile tilapia, reare...
Show More
-
Livelihoods Means and Local Populations Strategies of the Luki’s Biosphere Reserve in Democratic Republic of Congo
Jean Semeki Ngabinzeke,
Yves Meyanga Tongo
Issue:
Volume 4, Issue 2, March 2019
Pages:
42-49
Received:
5 March 2019
Accepted:
13 April 2019
Published:
17 May 2019
Abstract: The Luki’s Biosphere Reserve (LBR), latter remnant Mayombe’s forest in Democratic Republic of Congo, is exposed to a prominent human pressure. After the independence process that occurred in the country, the “zaïrianization’’ policy of nationalization lead to the agro-industrial collapse. Face to that situational configuration and then compelled to unemployment, the population turned on forest activities, such as, slash and burn shifting cultivation, carbonization, operating timber and hunt, which tend to be their main basic live hoods means. The problem of this study is, based on how local populations tend to survive despite the crises and above any lack of support? Responding to that preoccupation, an investigation focus on systemic analyses of various ways of subsidence had been realized in four (04) local villages of the reserve: Kinzua-Mvuete, Kikalu, Kiyalala, Kiyangala. Data’s collecting through a systemic approach and analysis shown a serious dependence toward forest resources; in a stamped context of demographical progression, generalized by poverty and weaknesses of environmental governance, the populations have developed several strategies of survive in terms of, intensification, diversification and migration. Those assorted activities consisted especially to the non-respect of the fallow period, the land dispute, the felling of small diameter trees, the modification of land use, conducting to deforestation and to degradation, increase therefore misery. In order to reconcile the objectives of development and conservation: agroforestry, fish farming, beekeeping, and sensitization have been suggested.
Abstract: The Luki’s Biosphere Reserve (LBR), latter remnant Mayombe’s forest in Democratic Republic of Congo, is exposed to a prominent human pressure. After the independence process that occurred in the country, the “zaïrianization’’ policy of nationalization lead to the agro-industrial collapse. Face to that situational configuration and then compelled to...
Show More
-
Impact of Radical Terracing on Chemical Properties of the Soil a Case of Nyabihu District, Rwanda
Niragire Ezechiel,
Maniragaba Abias
Issue:
Volume 4, Issue 2, March 2019
Pages:
50-54
Received:
12 March 2019
Accepted:
30 April 2019
Published:
3 June 2019
Abstract: Cultivation on steep slopes without any kind of soil conservation methods causes’ major erosion phenomenon, in Nyabihu District of Rwanda radical terraces has been implemented in order to decrease soil erosion effect. This study aimed at assessing the impact of this radical terracing on the soil chemical properties. Soil samples was collected before and after terracing and analyzed for pH, organic matter, available phosphorous, exchangeable calcium, magnesium and potassium; cation exchange capacity, total nitrogen and total exchangeable acidity. The pH and organic matter was analyzed respectively using a pH-meter and calcinations method, while the available phosphorous were obtained using the MEHLICH III method, exchangeable Ca2+ and Mg2+ by titrimetric, potassium, cation exchange capacity, total nitrogen and total exchangeable acidity were determined using the K-kit method, Nessler method, mineralization and titrimetric method respectively. The results from the soil samples analyzed showed that terracing have an impact on soil chemical properties of the soil. All the studied properties decreased except the total exchangeable acidity which increased, therefore, the soil after terracing needs improvement of its fertility and productivity; through sufficient agricultural inputs both mineral and organic.
Abstract: Cultivation on steep slopes without any kind of soil conservation methods causes’ major erosion phenomenon, in Nyabihu District of Rwanda radical terraces has been implemented in order to decrease soil erosion effect. This study aimed at assessing the impact of this radical terracing on the soil chemical properties. Soil samples was collected befor...
Show More
-
Study on the Difficulties and Countermeasures of Mobile Trafficking in China's Small and Medium Cities
Shaogang Liao,
Xueman Fu,
Wendong Xie
Issue:
Volume 4, Issue 2, March 2019
Pages:
55-61
Received:
26 April 2019
Accepted:
29 May 2019
Published:
11 June 2019
Abstract: Under the environment of accelerating urbanization in China, the phenomenon of urban mobile vendors has become one of the important difficulties in urban management in China, and the problem of governance of mobile vendors has become particularly difficult. The causes of urban mobile vendors are difficult to have a profound social history and institutional roots. Its governance should be based on finding a balance between urban management and the mobile vendor economy, and finding an entry point to meet the needs of residents and the orderly environment. This paper analyzes the group characteristics, living status and social impact of mobile vendors in China's small and medium-sized cities from the perspectives of urban managers, mobile vendors and the public. It finds out the predicament of urban mobile vendors. By drawing on the successful experiences of developed cities such as Wuhan, Wenzhou and Beijing on the management of mobile vendors, they will adopt the combination of unblocking and arranging; classifying time-division and regional management; improving the management system and related laws and regulations of mobile vendors; establishing autonomous organizations for mobile vendors; establish and improve the supervision mechanism, and so on, promote the governance of mobile vendors in small and medium-sized cities to promote harmonious coexistence between the vendor economy, urban cityscape and people's lives.
Abstract: Under the environment of accelerating urbanization in China, the phenomenon of urban mobile vendors has become one of the important difficulties in urban management in China, and the problem of governance of mobile vendors has become particularly difficult. The causes of urban mobile vendors are difficult to have a profound social history and insti...
Show More
