| Summary: | ABSTRACT Grass Carp fingerlings averaging 19.0 ±1.0 g in weight were stocked for 60 days at different P H levels. The experimented Carp were fed with diet containing 26.58% crude protein. The total water was changed twice daily. Growth and survival of common carp was recorded at 15 days interval. Results showed that growth performance was significantly decreased at P H 6 and 9, while the difference between P H 7 and 8 were not significant (P>= 0.05). No mortality occurred during the experiment. Feed conversion ratio (FCR) increased at P H 6 and 9, since at the P H 6 value was significantly higher than P H 9. It was concluded that water P H 7-8 could be more suitable to Grass carp culture for optimum growth performance and survival rate. References A. (2001). Product profile common carp, Expansion of Ecuador's Export Commodities, CBI Project. De Croux P., M. Julieta and A. Loteste. (2004).Lethal effects of elevated pH and ammonia on juveniles of neotropical fish Colosoma macropomum (Pisces: Caracidae). J. Environ. Biol.; 25: 7-10. Xu J. Y., X. W. Miao, Y. Lu and S.R. Cui. (2005). Behavioural response of Common Carp ( Cyprinus carpio ) to acute ammonia stress monitored by Computer vision. J. Zhejiang University Biol. Sci., 6: 812-816. National Research Council. (1993). Nutrient Requirements of Fish, National Academy Press, D. C. Washington. De-Silva, S. S. and T. V. Anderson. (1995). Fish Nutrition in Aquaculture, St. Edmundsbuzy Press, Subfolk, UK. Zar J. H. (1996). Biostatistical Analysis. Prentice Hall, New Jersey. Saber A., E. L. Shafai, A. Fatma E. L. Gohary, A. N. Fayza, N. Peter Van Der Steen and J. G. Huub.(2004). Chronic Ammonia toxicity to duckweed fed common carp ( Cyprinus carpio ). Aquaculture, 232: 117-127. Atle, F., S. I., Kavuopio, B. S. Sacther and T. H. Evensen. (2004). Effect of chronic ammonia exposure on growth in juvenile Atlantic cod. Aquaculture, 237: 179-189. Saha N., Z. Y. Kharbuli, A. Bhattacharjee, C. Goswami and D. Haussinger. (2002). Effect of alkalinity (pH=10) on urecogenesis in ...
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