CARBOHYDRATE TO LIPID RATIO(CHO/L) IN PRACTICAL TILAPIA DIETS: 2- RESPONSE OF BODY SIZE IN HYBRID TILAPIA (OREOCHROMISNILOTICUSXOREOCHROMISAVREUS) TO INCREASED LEVEL OF CHO/ L RATIO IN DIETS. | ||
| Egyptian Journal of Aquatic Biology and Fisheries | ||
| Article 3, Volume 6, Issue 3, September 2002, Pages 39-58 PDF (987.79 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejabf.2002.1750 | ||
| Author | ||
| Ahmed El- Haaimady | ||
| Fish Nutrition lab. National Institute of Oceanography and fisheries, Kgypt. 101 Kasr El- Aini sti\, Cairo, Egypt. | ||
| Abstract | ||
| Four artificial diets were formulated to contain four carbohydrate to tipid ratios (CHO/ L) (2, 4, 6 and 8). The gross energy of each diet was adjusted by balancing the biscuit industry by - product as a carbohydrate .source and cotton seed oil mix to provide four tested CHO:L ratios. The diets were used to determine the optimum dietary level of CIIO:L ratio for two sizes of hybrid tilpia initially weighing 10.0 and 80.0g for 160 days.Growth values were better with feed 4CHO:L ratio for the smaller fish, whereas similar (4) CHO:L ratio yielded the highest feed conversion efficiency, protein, energy and lipid retained for the same size (with the starting average weight 10.Og respectively). However, feeds with 6 CHO:L ratio proved better in large hybrid tilapia (initially weighing 80.Og). The hepatosomatic index showed higher values for feeds with 8 CHO:L ratio in the case of small and large fish, but the opposite was observed for liver lipid content which showed a tendency toward higher values for 2 CHO:L ratio in both small and large hybrid tilapia. These data suggest that small hybrid tilapia can perform well with diet containing 4 CHO:L ratio, whereas large fish may be as efficiently at 6 CHO:L ratio | ||
| Keywords | ||
| hybrid tilapia; carbohydrate to Jipid ratio; fish size; Growth performance; hepatosomatic index | ||
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