The present experiment was carried out at the hatchery of Arab Fisheries Company at Abbassa. Two experiments were conducted in the present study. The first experiment aimed to study the effect of flumequine on reproductive performance of Nile tilapia fish (Oreochromis niloticus) broodstock while the second experiment aimed to study the effect of flumequine on growth performance and feed utilization of Nile tilapia fry. The first experiment extended from 1st July 2003 and lasted 25 September of the same year. Four concrete ponds (3 × 10 × 1 m) were used and represented four treatments and each pond was stocked with 30 females and 10 male. The basal diet of broodstock fed commercial diet contained 32% crude protein at a daily rate of 5% of the total biomass. The experimental diets enriched by 0, 10, 14 or 18 mg flumequine/kg of total biomass/day (0, 570, 805 and 1030 mg/kg diet). Fish fed the diets twice a day (9:00 am and 3:00 pm) for 5 days and then fed the basal diets (0-flumequine). For the second experiment, eight fiberglaas tanks (180 l for each) were stocked by 800 tilapia fry (100 fry for each tank) and fed 40% CP diet contained the same flumequine doses used for broddstock (0, 10, 14 or 18 mg flumequine/kg of total biomass/day i.e. 0, 570, 805 and 1030 mg/kg diet).at a feeding rate of 20% of the total biomass for 28 days and then decreased to 10% of the total biomass (6 days/week) to the end of the experiment (75 days). The obtained results could be summarized as follows:
First experiment
- Average total egg weight (g) per female (EW/F) and egg weight (g)/g of body weight (EW/GF) as affected by addition of flumequine to diets for Nile tilapia are found to be 10.82, 14.14, 14.70 and 11.27, and 0.03, 0.04, 0.04 and 0.03 g for EW/F and EW/GF for the different flumequine doses; 0, 10 mg, 14 mg and 18 mg flumequine, respectively. Number of eggs in one gram egg (NE/GE) is 102.33, 97.73, 94.5 and 104.57 for the different treatments, 0, 10 mg, 14 mg and 18 mg, respectively.
- Absolute fecundity was 1112.07, 1322.6, 1355.67 and 1177.03, while the and relative fecundity was 3.27, 3.63, 3.86 and 3.33 for the different flumequine doses, 0, 10, 14 and 18 mg flumequine, respectively. Hatchability percentage was 89.81, 89.91, 93.27 and 89.74 for the flumequine doses, 0, 10, 14 and 18 mg flumequine, respectively and the differences among averages were not significant for relative fecundity and hatchability percentage.
- Fry number/fish (FN/F) and fry number/g of female body weight were 767.5, 960.03, 996.37 and 829.87 fry for the different doses, 0, 10 mg, 14 mg and 18 mg, respectively, and the averages treatments of (FN/G) were 2.25, 2.83, 2.84 and 2.36, respectively, for the different treatments, 0, 10 mg, 14 mg and 18 mg, respectively and the differences among the different flumequine doses 0, 10 mg, 14 mg and 18 mg, were significant for the two traits.
Second experiment:
- During the entire experimental period, body weight (BW), weight gain (WG) and specific growth rate (SGR) for fry fed the diet contained 10 mg flumequine/kg of body weight were higher than that fed the other treatments, and the differences were significant (p |
