| Naga
- The *ICLARM Quarterly
Vol.
23, No. 1 (January - March 2000)
Network
of Tropical Aquaculture Fisheries Professionals
(NTAFP) Section
Aquabyte
(Aquaculture Section of NTAFP)
River-based
Artificial Propagation of the African Catfish
Clarias gariepinus: an Option for the Small Fish
Farmer
H.
Charo and W. Oirere
Abstract
A cheap
method of propagating the African catfish, Clarias
gariepinus, by incubating the fertilized eggs
in a cage placed directly in a flowing river is
described. Hatching ranged between 39 and 70%.
This is not significantly different from the commonly
used water recirculating flow through system.
The economic advantages of the river hatching
method are discussed with special emphasis on
the rural fish farmers.
H.
Charo and W. Oirere are from the KMFRI-Sangoro
Research Centre, P.O. Box 136, Pap-Onditi, Kenya.
Bioconversion
Efficiency and Growth in the White Shrimp, Penaeus
indicus (Milne Edwards), Fed with Decomposed Mangrove
Leaves
S.
Athithan and V. Ramadhas
Abstract
Food
conversion efficiency and growth in the white
shrimp Penaeus indicus fed with decomposed
mangrove leaves of Avicennia marina and
A. officinalis were monitored under laboratory
conditions. It was observed that test animals
fed with the decomposed leaves of A. marina
had higher assimilation efficiency (87.96%), gross
growth efficiency (10.82%), net growth efficiency
(12.3%) and relative growth rate (0.0603 g/day)
than those fed with A. officinalis. The
relatively higher growth registered in the animals
fed with decomposed leaves of A. marina
was attributed to its high calorific and protein
content.
S.
Athithan and V. Ramadhas are from the
Fisheries College and Research Institute, Tuticorin
- 628 008, India.
 |
