Thesis (MPhil (Animal Sciences. Aquaculture))--University of Stellenbosch, 2005. / This paper contains literature on tilapia culture, feeding and nutritional factors of prime
consideration to survival and growth of Oreochromis mossambicus. Results are presented
for a three-phase laboratory experiment on survival of O. mossambicus fry in an attempt
to evaluate the use of live Spirulina platensis. The experiment was conducted on fry in a
closed system in an effort to maximize the use of live Spirulina and also optimize growth
and production.
Fry were tested for tolerance levels of salinities, 0-35 g/lt, and showed favourable
survival rates up to 15 g /lt salinity without being fed. Manipulation of input in freshwater
turned high fry mortalities with increasing rates without difference for physical form of
Spirulina. Growth was not significantly affected by types of input. However fry grew
well at 0-40% rates with considerable survival performance. It is noted good quality of
water that allow improved survival and growth of fry in a closed system may be assured
with rates of input up to 5 or 10% of bodyweight. These input rates can guide use of live
Spirulina in saline water tilapia culture if Spirulina proves good productivity at the
consistency of fry tolerance to the salinity levels established in this paper.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/3381 |
| Date | 04 1900 |
| Creators | Asgodom, Mihretu T. |
| Contributors | De Wet, Lourens, Brink, Danie, University of Stellenbosch. Faculty of Agrisciences. Dept. of Animal Sciences. Aquaculture. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Rights | University of Stellenbosch |
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