* ICLARM is now known as WorldFish Center

Naga - The *ICLARM Quarterly
Vol. 24, No. 1 & 2 (January – June 2002)

Community-Based Aquaculture in India-Strengths, Weaknesses, Opportunities and Threats

Community-based 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.

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Factors Determining Spawning Success in Penaeus monodon Fabricius
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.

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Length-Weight Relationships of Penaeus Monodon Reared in Semi-Intensive Culture Systems of Kerala, India  
G. Prasad

The results of a study on length-weight relationships of Penaeus monodon, reared in fertilized ponds and fed three different supplementary feeds are presented.

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In vitro Comparison of Zeolite (Clinoptilolite) and Activated Carbon as Ammonia Absorbants in Fish Culture
H. 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. 

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Low Cost Murrel Seed Production Technique for Fish Farmers 
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.

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