No Thumbnail Available

Mass synchronized spawning of Tilapia guineensis

Establishment of African Regional Aquaculture Centre

Year of publication 1986

Pages p.9

Author D. Campbell, A.T. Mahatane* and S. O. Aleem;Fisheries and Aquaculture Management Division

Product type Project

Edition 1

Synopsis (short abstract) technique for mass synchronized spawning of Tilapia guineensis is described. By introducing a single couple into each of a series of 25,0.4m3 concrete tanks, 102 spawns were obtained from a total of 179 couples with 1355 ± 726 (mean ± SD) fry produced per spawn. Using fish captured from the wild, 64% spawned in 3.3 ± 2.01 days. 48% of the fish that had been previously used and kept in ponds spawned in 8.8 ± 5.75 days. Fish produced during a one week period were of sufficiently uniform size to av oid cannibalism when introduced into ponds.

Language English

Also available in:
No results found.

Related items

Showing items related by metadata.

  • No Thumbnail Available
    Project
    Report 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
    1982
    Also available in:
    No results found.
  • No Thumbnail Available
    Project
    Influence 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
    1987
    Also 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 Available
    Project
    Preliminary results in the establishment of private tilapia fingerling producers in Western Kenya with some considerations for the future 1995
    Also available in:
    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.
Show more

Users also downloaded

Showing related downloaded files

No results found.