Determinants of Nile perch (Lates niloticus) overfishing and its intensity in Lake Victoria, Tanzania: a double-hurdle model approach
The current fishing pressure in Lake Victoria, Tanzania indicates that the Nile perch (Lates niloticus) is overfished and no regulations are enforced to maintain a sustainable fishery despite its significant contribution to the economy. This study examines the determinants of Nile perch overfishing and its intensity in Lake Victoria, Tanzania, using a double-hurdle model that is based on baseline survey data collected from 268 Nile perch fishers. The model analysed the data in two sequential hurdles, the first hurdle being whether or not a Nile perch fisher overfished (probability of overfishing), and the second hurdle being the difference between the actual average catch size and the minimum slot size of 50 cm total length (TL) (intensity of overfishing). The study revealed that different socio-economic, institutional and fishing effort influence Nile perch overfishing and its intensity in Lake Victoria, Tanzania. This, therefore, suggests that, to attain a balance between sustainable fishery management and the livelihood for Nile perch fishers in Lake Victoria, there is a need for the government to design policies that will consider the dynamics of the institutional setup and fishing effort in this lake.
KeywordsSlot size Gillnet mesh size Hook size Fishery regulations
Mzumbe University of Tanzania is acknowledged for supporting data collection of this study. Thanks are also conveyed to Tanzania Fisheries Research Institute (TAFIRI) for providing the administrative logistics and permits, and to the fishers and key informants who participated in the survey.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Ethical clearance for this study (Ref. HSS/1572/017D) was obtained from the University of KwaZulu-Natal Research office.
- Abebaw S, 2003. Dimensions and Determinants of Food Security among Rural Households in Eastern Ethiopia. Master Thesis. Alemaya University, Ethiopia.Google Scholar
- Acere, T. O., 1985. Observations on the biology, age, growth, maturity and sexuality of Nile Perch, Lates niloticus (Linne) and the growth of its fishery in the northern waters of Lake Victoria. In A Report of the Committee for Inland Fisheries of Africa on development and management of the fisheries of Lake Victoria. FAO Fisheries Report No. 335: 42–61.Google Scholar
- Akinbode, S. O. & A. O. Dipeolu, 2012. Double-hurdle model of fresh fish consumption among urban households in South-West Nigeria. Current Research Journal of Social Sciences 4: 431–439.Google Scholar
- Asfaw, S., B. Shiferaw & F. Simtowe, 2010. Does technology adoption promote commercialization? Evidence from chickpea technologies in Ethiopia. In CSAE 2010 conference on Economic Development in Africa, University of Oxford, UK.Google Scholar
- Eggert, H. & R. B. Lokina, 2008. Regulatory Compliance in Lake Victoria Fisheries. Environment for Development Discussion Paper Series. EfD DP: 08-14.Google Scholar
- FAO., 2003. Information on Fisheries Management in the Republic of Uganda. http://www.fao.org/fi/oldsite/FCP/en/uga/body.htm (accessed 09/06/2018).
- FAO, 2008. Lake Victoria Fisheries Organization and FAO National Stakeholders’ Workshops on Fishing Effort and Capacity on Lake Victoria. FAO Fisheries and Aquaculture Report No. 817.Google Scholar
- FAO, 2018. Frame Surveys. http://www.fao.org/docrep/004/Y2790E/y2790e09.htm. (accessed 19/12/018).
- Greene, W., 2012. Econometric Analysis, 7th ed. Prentice Hall, Upper Saddle River.Google Scholar
- Guillen, J. & F. Maynou, 2016. Increasing fuel prices, decreasing fish prices and low productivity lead to poor economic performance and capacity reduction in the fishing sector: evidence from the Spanish Mediterranean. Turkish Journal of Fisheries and Aquatic Sciences 16: 659–668.CrossRefGoogle Scholar
- Inoni, O. E. & W. J. Oyaide, 2007. Socio-economic analysis of artisanal fishing in the South Agroecological Zone of Delta State, Nigeria. Agricultural Tropical and Subtropical 40: 11–17.Google Scholar
- Kolding, J., M. Medard, O. C. Mkumbo & P. A. M. van Zwieten, 2014. Status, trends and management of the Lake Victoria fisheries. In Inland fisheries evolution and management. Case studies from four continents. FAO Report No. 579: 49–62.Google Scholar
- Lokina, R. B., 2014. Fishing business arrangements and sustainability in Lake Victoria fishing. African Journal of Economic Review 2: 71–94.Google Scholar
- Luomba, J., P. Onyango & R. Chuenpagdee, 2017. Closing Loopholes with the Small-Scale Fisheries Guidelines: Addressing Illegal, Unreported and Unregulated Fishing in Lake Victoria, Tanzania. In The Small-Scale Fisheries Guidelines. Springer, Cham: 541–556.Google Scholar
- LVFO, 2007. Regional synthesis of the 2007 socioeconomic monitoring survey of the fishing communities of Lake Victoria. Lake Victoria Fisheries Organisation, Jinja, Uganda, Report No: 96.Google Scholar
- LVFO, 2008. The fisheries management plan for Lake Victoria, 2009–2014. http://www.fao.org/3/a-bl763e.pdf (accessed 21/08/2018).
- Lwenya, C., B. Mbilingi, J. Luomba & E. Yongo, 2009. Gender integration in the management of the Lake Victoria fisheries. African Journal of Tropical Hydrobiology and Fisheries 12: 59–66.Google Scholar
- Mkumbo, O. C., 2002. Assessment and management of Nile perch (Lates niloticus L.) stocks in the Tanzanian waters of Lake Victoria. Doctoral dissertation, University of Hull.Google Scholar
- Musengezi, J. D., F. J. Rossi & S. L. Larkin, 2006. A Double Hurdle model of preferences for a proposed capacity reduction program in the Atlantic shark fishery. In Southern Agricultural Economics Association Annual meetings, February 5, 2016.Google Scholar
- Mutabazi, K., S. Wiggins & N. Mdoe, 2013. Commercialization of African Smallholder Farming. The Case of Smallholder Farmers in Central Tanzania. Future Agriculture. Working Paper, 72.Google Scholar
- Njiru, M., A. Getabu, A. M. Taabu, E. Mlaponi, L. Muhoozi & O. C. Mkumbo, 2009. Managing Nile perch using slot size: is it possible? African Journal of Tropical Hydrobiology and Fisheries 12: 9–14.Google Scholar
- Ogari, J., 1985. Distribution, food and feeding habitats of Lates niloticus in Nyanza Gulf of Lake Victoria (Kenya). A Report of the Committee for Inland Fisheries of Africa on development and management of the fisheries of Lake Victoria. FAO Fisheries Report No. 335: 68–80.Google Scholar
- Ogello, E. O., K. O. Obiero & J. M. Munguti, 2013. Lake Victoria and the common property debate: is the tragedy of the commons a threat to its future? Lakes Reservoir and Ponds 7: 101–126.Google Scholar
- Ostrom, E., 1997. Common-pool resources and institutions: toward a revised theory. In ARE Handbook. http://hdl.handle.net/10535/5674 (accessed 20/08/2018).
- Shettima, B. G., S. T. Mohammed, A. A. Ghide & P. L. Zindam, 2014. Analysis of socio-economic factors affecting artisanal fishermen around Lake Alau, Jere Local government Area of Borno State, Nigeria. Nigerian Journal of Fisheries and Aquaculture 2: 48–53.Google Scholar
- Sime, S. D., 2015. The socioeconomics of small scale fisheries based on Eastern side of Lake Abaya, Ethiopia. International Journal of Fisheries and Aquatic Studies 2: 87–93.Google Scholar
- Teklewold, H., L. Dadi, A. Yami & N. Dana, 2006. Determinants of adoption of poultry technology: a double-hurdle approach. Livestock Research for Rural Development 18: 1–11.Google Scholar
- URT, 2003. Ministry of Natural Resources and Tourism: The Fisheries ACT, 2003 (Act No.22 of 2003), Dar-Es-Salaam, Tanzania.Google Scholar
- URT, 2014. Ministry Of Livestock and Fisheries Development Fisheries Development Division Fisheries Annual Statistics Report-2013. Fisheries Development Division, Dar es Salaam.Google Scholar
- URT, 2015. Report On Lake Victoria Fisheries Frame Survey Results 2014–Tanzania. Ministry Of Livestock and Fisheries Development Department of Fisheries Development.Google Scholar
- WWF, 2018. Overview of overfishing. https://www.worldwildlife.org/threats/overfishing (accessed 09/06/2018).