Fish Culture Essay

Results &Discussion

Fish culture is increased to compensate the shortage of animal protein allover the world. Fish under intensive culture conditions will be badly affected by different microbial pathogens that have been treated with antibiotics were intensively used producing great problems of bacterial drug resistance on one hand and the public health hazards as residues in fish meat (Robertson et al., 2000). The use of natural immunostimulants in fish culture for the prevention of diseases in a promising new development and could solve the problems of massive antibiotic use.

Tabe (2): Carcass chemical composition of Nile tilapia (O. niloticus) fed diet containing probiotics.

Treatment DM CP EE Ash

Control ( C) 25.9±2.01a 52.65±3.2

niloticus) fingerlings at the end of feeding experiments indicated that carcass dry matter (DM) content and the crude protein values (CP) were higher in fish groups fed the diet supplemented with the probiotics. Ether extract (EE) content of fish carcass and ash content were lowered in fish groups fed significant differences diet supplemented with high level of Yeasture and Biogen followed with by lower level table (2). Similar trend of changes in O. niloticus fed on diet supplemented with lactosacc was observed by Magouz et al. (2002). Feeding fish on probiotic containing diets resulted in an increase in dry matter and ether extract of fish carcass, the relative abdominal fat pad was significantly reduced with adding Lactobacillus culture to broiler chick diet compared to the control group (Kalavathy et al., 2003). Generally, body composition of fish in all groups is within the range reported by Abdelhamed et al. (2000). Table (3): feed utilization of Nile tilapia (O. niloticus) fed diet containing probiotics.

Items Treatment C Y1 Y2 B1 B2

IW 20.8 ± 0.8a 20.5 ± 1.1a 20.9 ± 2.4 a 20.5 ± 0.9a 20.9 ± 1.3 a

FW 41.0±3.1a 44.6±2.3b 49.3±4.2c 44.06±1.6b 47.3±3.7c

TG 20.4±2.03a 24.1±1.3b 27.4±1.04c 23.5±1.32b 26.36±1.4 c

DWG 0.29±0.01a 0.34±0.01b 0.39±0.02c 0.34±0.01b 0.37±0.01c

FCR 3.0±0.1c 2.2±0.4b 1.73±0.02a 2.4±0.8b 1.93±0.04 a

SGR 0.97±0.02 a 1.2±0.2b 1.2±0.1b 1.12±0.08 b 1.1±0.01ab

FI 66.45±2.9c 52.4±3.2b 47.48±4.3a 56.6±1.9 b 51.03±5.2