Author:
S.O. Ngodhe,E. Kerich,O. Owuor,P. Mutai
Abstract
The main aim of this study was to compare the environmental variables between water inside the caged fish, open ponds and open waters of Winam Gulf. Selected water quality parameters from the 20 ponds, 30 cages and wild were measured in-situ using electronic meters. Water temperature, DO, pH and salinity did not differ significantly in the different study areas (p>0.05) while Total Dissolved Solids (TDS) registered a significant difference between the culture systems (pond and cage) and the wild (p<0.05). This was attributed to the fact that the study areas were all within the same geographical space and there was lack of variation in micro-climatic conditions during the study period, while the differences in TDS could be as a result of over fertilization of ponds, leading to algal bloom. The environmental variables were within the Food and Agricultural Organization (FAO) of the United Nations recommended limits for fish production.
Publisher
African - British Journals
Reference29 articles.
1. Afzal M. Rab A.; Akhtar N., Khan M.F. Barlas A., and Qayyum M. (2007): Effects of Organic and Inorganic fertilizers on the growth performance of bighead carp 77 (Aristichthys nobilis) in polyculture system. International Journal of Agriculture and Biology, 9(6): 931-933.
2. Aguilar, A., Alvarez, M. F., Leiro, J. M., & Sanmartin, M. L. (2005): Parasite populations of the European eel (Anguilla anguilla L.) in the Rivers Ulla and Tea (Galicia, northwest Spain). Aquaculture, 249(1), 85-94.
3. Awange, J.L., and Ong’ang’a, O. (2006). Lake Victoria: Ecology, Resources, Environment
4. (Berlin, Germany: Springer Verlag).
5. Ayroza, D. M., G, N. M., Ayroza L M D S, Carvalho E D, Ferraudo A S, & Camargo A F M. (2013). Temporal and Spatial Variability of limnological characteristics in areas under the influence of Tilapia cages in the Chavantes reservoir, Paranepanema River, Brazil. Journal of the World Aquaculture Society, 44(6), 814-825.