Growth Performance of the Nile Tilapia, Oreochromis Niloticusf Cultured in Cages in Two Dams in the Bongo District of Ghana

This study was carried out to compare the growth performance and survival rate of Nile tilapia, Oreochromis niloticus cultured in cages in two different dams in the Bongo District of the Upper East Region of Ghana. Three cages with the same structural characteristics were constructed in each of the dams as replicates. Each cage was stocked with 9500 all male O. niloticus fingerlings and fed with 48 % nourish plus feed thrice daily for a period of eight weeks. Twenty-five samples of the fishes were randomly collected bi-weekly from each cage and measurements such as standard length and body weight recorded. Other growth characteristics such as specific growth rate (SGR), feed conversion ratio (FCR), protein efficiency ratio (PER), mean weight gain (MWG), condition factor (K) and survival rate (SR) were estimated. The results revealed that, O. niloticus cultured in the Soe-Yidongo community dam recorded the highest growth performance in terms of final body weight, standard length, weight gain, specific growth rate, condition factor and protein efficiency ratio, and they were significantly different (p < 0.05) from those recorded in the Bon-Gurigo community dam which was attributed to the variations recorded in the physicochemical parameters of the two dams. It was concluded that tilapia cultured in cages might be an important alternative livelihood strategy for poor people in rural communities in Ghana

Dynamika zmian użytkowania ziemi na granicy rolno-miejskiej: studium metropolii i okolic Kumasi – Ghana

Land development and consumption have spun out of control in major cities in Ghana. Kumasi as the second main and fastest growing city with an annual population growth rate of 5.4% in Ghana is experiencing this phenomenon. Land use/cover change in rural–urban peripheral is foremost to these dynamic changes. This study is premised on remote sensing and GIS methods to explore urbanization in Kumasi rural–urban fringe. Satellite data (Landsat multi-temporal images and Disaster Monitoring Constellation-DMC) and GIS techniques were used to analyze and compute the land cover changes (amount, trend and location) that had transpired for the period of 1986 to 2011. This study assesses the nature, extent and impact of urban growth (compact and sprawl) on Kumasi and surrounding districts. The study showed that, forest loss is massive, agricultural activities in Kumasi is receding as the years go but intensifying in the fringe districts. Settlements are expanding in all directions at the expense of farmland but firstly along the roads