Fisheries and Aquatic Sciences

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Growth of Sex Reversed Nile Tilapia, Oreochromis niloticus In a Closed Recirculating Culture System

  • Yoon Gil Ha (Chongpyong Inland Fisheries Institute, NFRDI) ;
  • Jo Jae-Yoon (Department of Aquaculture, Pukyong National University) ;
  • Kim Youhee (Department of Marine Biotechnology, Gangwon Provincial University) ;
  • Kim In-Bae (Department of Aquaculture, Pukyong National University)
  • Published : 2002.03.01
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Abstract

Swim up fry of the Nile tilapia, Oreochromis niloticus, were fed 0 or 60 mg l7-methyltestos­terone (MT) per kg feed for 30 days. Fish that had been fed 0 or 60 ppm MT for the first 30 days were subsequently fed a commercial diet for 56 weeks to evaluate growth, survival, sex ratio, body composition, gonadosomatic index and the total edible portion. Mean body weight of MT treated group and untreated group were 1.7 g and 1.1 g, respectively at the end of the treatment for 30 days $(P<0.05)$. The experiment was terminated after a total of 60 weeks, the mean body weight of the MT treated population was 1,016 g and that of the untreated population was 762g $(P<0.05)$. However, the final mean body weight of untreated males (l, 086g) was not significantly different from treated males (l,016 g), but the mean body weight of the female group was 512 g. Therefore, the reason for the lower mean body weight of the untreated group was entirely due to stunted females. The percentage fillet yield of MT treated fish$(34.6\%)$ was not significantly different from that of the untreated males $(34.4\%)$, but the untreated females were lower than those of both treated and untreated male groups $(32.4\%)$ (P<0.05). There were no significant differences in the percentage of the all edible portion (AP) between MT treated and untreated males, but females were lower than males. Females are smaller fish in size and the gonads are larger in proportion which were discarded along with the intestine this explains the observed difference. Total biomass of the two groups were 134.8kg and 104.5kg per $m^3$, respectively. The proportion of fish reaching a marketable size of over 800 g in body weight within 14 months were $78\%$ in the MT treated group and $41\%$ in the untreated group.

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References

  1. Ali, P.K.M.M. and G.P.S. Rao. 1989. Growth improvement in carp, Cyprinus carpio (L.), sterilised with 17-methy1-testosterone. Aquaculture, 76, 157-167 https://doi.org/10.1016/0044-8486(89)90260-3
  2. Billy, A.J. and N.R. Liley. 1985. The effects of early and late androgen treatments on the behaviour of Sarotberodon mossambiws (Pisces: Cichlidae). Hormone Behav., 19,311-330 https://doi.org/10.1016/0018-506X(85)90030-3
  3. Ellis, S.C., W.O. Watanabe and W.D. Head. 1993. Effect of initial age variation on production of Florida red tilapia fry under intensive, brackish water tank culture. Aquac. Fish. Manag., 24, 465-471
  4. Guerrero, R.D. 1975. Use of androgens for the production of all male Tilapia aurea (Steindachner). Trans. Am. Fish. Soc., 104, 342-348 https://doi.org/10.1577/1548-8659(1975)104<342:UOAFTP>2.0.CO;2
  5. Guerrero, R.D. 1982. Control of tilapia reproduction, In Biology and Culture of Tilapias, R.S.V. Pullin and R.H Lowe-McConnel, eds. International center for living Aquatic resources management, Conference proceeding 7, Manila, PP. 309-316
  6. Jo, J.-Y. 1988a. Effects of 17-methy1testosterone concentration in the diet on sex reversal and growth of Tilapia aurea. In Doctoral Dissertation, Auburn University, Alabama, pp. 4-27
  7. Jo, J.-Y. 1988b. Residual effects of 17-methy1testosterone on second year growth, body composition and gonad weight of Tilapia aurea. In Doctoral Dissertation, Auburn University, Alabama, PP. 28-54
  8. Jo, J.-Y. 1988c. Effects of six levels of 17-methy1testosterone on sex reversal and growth in Tilapia aurea and T. nilotica. In Doctoral Dissertation, Aubum University, Alabama, PP. 55-63
  9. Jo, J.-Y., R.O. Smitherman and L.L. Behrends. 1988. Effects of dietary 17-methy1testosterone on sex reversal and growth of Oreochromis aureus. In The Second Inter-national Symposium on Tilapia in Aquaculture. R.S.V. Pullin, T. Bhukaswan, K. Tonguthai and J.L. Maclean, eds. ICLARM, Conference Proceeding 15, Department of Fishehes, Bangkok, Thailand and International Center for living Aquatic Resources Management, Manila, PP. 203-207
  10. Kim, I.-B. 1992. Fish culture. Sin-heung Publishing Compa-ny, Pusan, Korea, PP. 251 - 271
  11. Macintosh, D.J., T.J. Varghese and G.P.S. Rao. 1985. Hormonal sex reversal of wild-spawned tilapia in India. J. Fish BioL, 26, 87-94 https://doi.org/10.1111/j.1095-8649.1985.tb04245.x
  12. McGeachin, R.B., E.H. Robinson and W.H. Neill. 1987. Effect of feeding high levels of androgens on the sex ratio of Oreocbromis aureus. Aquaculture, 61, 317-321 https://doi.org/10.1016/0044-8486(87)90160-8
  13. Nakamura, M. 1981. Effect of ll-ketotestosterone on gonadal sex differentiation in Tilapia mossambica. Bull. Jap. Soc. Sci. Fish., 47, 1323-1327 https://doi.org/10.2331/suisan.47.1323
  14. Phelps, R.P., W. Cole and T. Kats. 1992. Effect of fIuoymesterone on sex ratio and growth of Nile tilapia, Oreochromis niloticus (L.). Aquac. Fish. Manag., 23, 405-410
  15. Pullin, R.S.V. and J.B. Capili. 1988. Genetic improvement otilapias: Problems and prospects, In The second In temational Symposium on Tilapia In Aquacultwe, R.S.V Pullin, T. Bhukaswan, K. Tonguthai, J.L. Maclean, eds Department of Fisheries, Bangkok, Thailand and Inter national center for living Aquatic Resources Manage-merit, Manila, PP. 259-266
  16. Tayamen, M.M. and W.L. Shelton. 1978. Inducement of sex reversal in Sarotherodon niloticus (L.). Aquaculture, 14, 349-354 https://doi.org/10.1016/0044-8486(78)90017-0
  17. Torrans, L., F. Meriwether, F. Lowell, G. Wyatt and P.D. Gwinup. 1988. Sex-reversal of Oreochromis aureus by immersion in mibolelone, a synthetic steroid. J. World Aquac. Soc., 19, 97-102 https://doi.org/10.1111/j.1749-7345.1988.tb01051.x
  18. Varadaraj, K. 1990. Production of monosex male Oreochromis mossambicus (Peters) by administering 19-norethi sterone acetate. Aquac. Fish. Manag., 21, 133-135
  19. Varadaraj, K., K.S. Sindhu and T.J. Pandian. 1994. Compari-son of conditions for hormonal sex reversal of Mo-zambique tilapias. Prog. Fish-Cult., 56, 81-90 https://doi.org/10.1577/1548-8640(1994)056<0081:COCFHS>2.3.CO;2