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No Thumbnail AvailableProjectReport of the Training course on seabass spawning and larval rearing - Songkhla, Thailand - 1 to 20 June 1982
South China Sea Fisheries Development and Coordinating Programme
1982Also available in:
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No Thumbnail AvailableProjectInfluence of two organochloride pesticides, Thiodan and Lindane on survival of fingerlings of Oreochromis niloticus (Linnaeus) and Tilapia zillii (Gervais)
Establishment of African Regional Aquaculture Centre
1987Also available in:
No results found.Toxic effects of two organochloride pesticides, Thiodan and Lindane on two tilapia species, Oreochromis (= Sarotherodon) niloticus and Tilapia zillii, were investigated in fresh water at 25–30°C under laboratory conditions. In the case of Thiodan LT 50 (median lethal time) values increased from 78 minutes at 1 ppm to 6.5 days at 0.001 ppm for T. zillii. As for Lindane the LT 50 values increased from 60 minutes at 2 ppm to 4.7 days at 0.125 ppm for O. niloticus while the corresponding LT 50 value s for T. zillii were 46 minutes and 2.7 days. No fish died within one week exposure at 0.0625 ppm Lindane for both O. niloticus and T. zillii. Median lethal concentrations (LC 50), obtained from regressions of pesticide concentrations and LT 50, indicated that the 96 hour LC 50's for Thiodan and Lindane were 0.00142 and 0.11590 ppm for O. niloticus, while the corresponding values were 0.00083 and 0.00597 ppm respectively for T. zillii. The safe concentration of Thiodan for O. niloticus was e stimated as 0.000588 ppm while that for T. zillii was 0.000321 ppm, and for Lindane the safe concentration was 0.0232 ppm for O. niloticus and 0.000762 ppm for T. zillii. The results showed that Thiodan was about 50 times more toxic than Lindane to O. niloticus and about 6 times more toxic than Lindane to T. zillii. -
No Thumbnail AvailableProjectPreliminary results in the establishment of private tilapia fingerling producers in Western Kenya with some considerations for the future 1995
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No results found.Otieno, Z., and D. Campbell., 1995. Preliminary Results in the Establishment of Private Tilapia Fingerling Producers in Western Kenya with some Considerations for the Future. KEN/86/027 Field Document No. 3. FAO. The initial results from training 16 small scale rural fish farmers in production techniques of fingerlings of Oreochromis niloticus, or tilapia, are analyzed. Over 15 months, the farmers produced and sold 46 900 tilapia fingerlings to other farmers, however none of the trained farmer s adapted the techniques they were trained in. This was due largely to the lack of a consistant, reliable market for the fingerlings produced. The paper then analyses the steps that need to be taken in the future; assistance in marketing, on-farm training, the introduction of all-male tilapia farming, and poly-culture with Clarias gariepinus which should create more of a steady demand for tilapia fingerlings. The course syllabus for the farmers is given in an appendix.
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