Aquaculture of nile tilapia (oreochromis niloticus linnaeus, 1758) with an assessment of its economic benefits in the lake Victoria basin, Tanzania
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Date
2013
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University of Dar es Salaam
Abstract
Fish stocks in Lake Victoria have drastically declined while the demand for fish has
exponentially increased, leading into inadequacy of fish. Aquaculture has the potential
of bridging the widening gap created by the increasing demand. Despite the enormous
potential for aquaculture development in the Basin, this sub-sector is still underdeveloped. This thesis examined the aquaculture of Nile tilapia (Oreochromis niloticus)
and assessed its economic benefits in the Basin. Assessment on fish pond performance
suggests that, despite low fish yield due to poor pond management, aquaculture offers an
opportunity for increased productivity. Investigations on diurnal dynamics of water
quality parameters showed that dissolved oxygen and un-ionized ammonia were beyond
the acceptable limits for fish growth suggesting a need for frequent water quality
monitoring in ponds. The effects of integrating fish farming with vegetables on fish
growth, yields and economic benefits revealed higher performance from integrated than
from non-integrated system, pointing to the importance of integrating fish farming with
other on-farm activities. The effects of stocking density on production and economic
benefits in polyculture and monoculture systems were assessed. It is suggested that the
choice of an optimum stocking density is an important aspect in attaining higher
performance in any culture system. Investigation on the reproductive biology of Nile
tilapia showed that its early breeding behaviour in captivity is not affected by culture
system and thus, its production can be improved through proper pond management. The
practical application of the results is discussed in detail in each chapter and a synthesis is
presented at the end of the thesis.
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Keywords
Aquaculture, Nile Tilapia, Tilapia, Oreochromis Niloticus, Economic aspects, Lake Victoria Basin, Tanzania
Citation
Shoko, A.P (2013) Aquaculture of nile tilapia (oreochromis niloticus linnaeus, 1758) with an assessment of its economic benefits in the lake Victoria basin, Tanzania, PhD dissertation, University of Dar es Dalaam. (Available at http://41.86.178.3/internetserver3.1.2/detail.aspx)