Naga - The
24, No. 1 & 2 (January June 2002)
Aquaculture in India-Strengths, Weaknesses, Opportunities
aquaculture founded on the principles of common
interest groups working together regardless
of sex and age has been an effective
tool for implementing scientific aquaculture programs
in India. Water bodies that do not interest villagers
are targeted for use to avoid communal problems.
Farmers who share common interests are identified
and organized and a team leader chosen among them.
An inventory of resources using the SWOT analysis
is made. A participatory approach to identify
major problems, socioeconomic and biophysical
constraints is used and appropriate interventions
are planned. This process is then evaluated and
the results of the impact assessment are provided
to research/extension/policy planners for
setting directions and priorities for further
improvement. The potential for expanding community
aquaculture for generating self-employment and
improving food security of the rural poor as well
as improving the environmental conditions of the
villages in India can be further tapped.
Article (PDF 114 KB)
Determining Spawning Success in Penaeus monodon
M. Babu, C. Ravi,
M.P. Marian and M.R. Kitto
Spawning success in relation to the size of spawner,
clumping of eggs, percentage of spawning and frequency
of spawning was studied in Penaeus monodon.
The results indicated positive correlation between
the size of spawner and the fecundity and hatching
percentage, but not the start of hatching. Hatching
characteristics were influenced by clumping of
eggs or abortive spawning; the greater the clumping,
the longer the time taken for hatching, resulting
in a lower hatching percentage. The start of hatching
time increased when the frequency of spawning
increased. Lower hatching rate was observed as
the frequency of spawning increased.
Article (PDF 37 KB)
Relationships of Penaeus Monodon Reared
Culture Systems of Kerala, India
The results of a study on length-weight relationships
of Penaeus monodon, reared in fertilized
ponds and fed three different supplementary feeds
Article (PDF 17 KB)
vitro Comparison of Zeolite (Clinoptilolite) and
Carbon as Ammonia Absorbants
in Fish Culture
Emadi, J.E. Nezhad and H. Pourbagher
Conditioned activated carbon was compared with
zeolite (clinoptilolite) at different salinities,
Total Ammonia Nitrogen (TAN) and times. The dosages
of both materials were the same ie. 10 ppt. Different
salinities from 0 to 30 ppt were prepared in 24
three-liter plastic buckets. One, 3 and 5 ppm
TAN were added to the buckets. TAN absorption
trend was monitored every 4 hours over 24 hours.
It was clear that over time, removed TAN decreased
for both materials. No change was observed in
the buckets containing zeolite, after 8 hours.
A similar trend was observed for activated carbon,
but, despite the decreasing rate of absorption
by activated carbon, ammonia (TAN) absorption
by both materials decreased. The largest difference
between these two materials was observed at 0
ppt salinity and difference was not significant
at 30 ppt salinity. After 24 hours, concentration
of TAN in buckets containing 1, 3 and 5 ppm TAN
decreased by 80.8%, 65.4% and 58.8%, respectively.
At the conclusion
of the study, a significant difference was observed
between zeolite and activated carbon and the results
obtained by zeolite were found to be more satisfactory
than activated carbon.
Article (PDF 37 KB)
Cost Murrel Seed Production Technique for Fish
K. Marimuthu, M.A.
Haniffa, M. Muruganandam and A.J. Arockia Raj
A simple and low-cost breeding technology for
breeding the striped murrel, Channa striatus
in hapas in ponds was developed.
Article (PDF 236 KB)