The Effects of Partial Replacement of Fish-Meal with Mesquite Pods on Growth Parameters of Tilapia Fry, Oreochromis mossambicus

This study was carried out to determine the effect of partial replacement of fish-meal with 15%, 30% and 45% of Mesquite pods (MP) in testing diets on growth parameters of Tilapia fries, Oreochromis mossambicus which reared in glass aquarium for 12 weeks. Twenty O. mossambicus fries (Mean initial weight 3.33 g) were randomly distributed into each 12 glass aquariums (measuring 50 x 50 x 50 cm) filled with tap water to 40 cm depth. Four treatments were formulated in this experiment. The first treatment was controlled and three testing diets contain 15%, 30% and 45% of MP. The results showed that the replacement of fish meal with Mesquite pods significantly reduced all growth parameters such as final weight, weight gain, food conversion ratio, specific growth rate, relative growth rate and protein efficiency ratio and survival of Tilapia fries Oreochromis mossambicus compared with control (without Mesquite pods) . The highest final performance weight of 67.33g was obtained in fish fed on the control diet and the lowest weight was 44.53g with fish fed on 45% MP in the testing diet. Also when using Mesquite pods as partial replacement of fish meal observed significantly elevated in all proximate composition of fish such as lipid, fiber and ash, except protein. From these results, it can be concluded that fish fed on testing diets had the acceptable growth performance when fish-meal was replaced with 15%, 30% and 45% of MP in testing diets

Effects of Probiotics Supplementation with Lactobacillus SP. Bacteria on Growth and Survival Rate of Cultured Mullet Fish (Mugil sp.) in Floating Cages

This study was conducted to determine the effect of probiotics, Lactobacillus acidophilus on the growth parameters of Mugil sp. fish, their approximate biochemical composition and the environmental conditions of their culture for 12 weeks in floating cages. Six hundreds of fish were randomly distributed in two groups of 100 fish in each floating cages (length of 1 m, width of 1 m, depth of 2 m) with an initial weight of 39.5± 0.2 g. The first group was fed with the control diet and the second group with probiotics diet. The results showed significant differences (P \u3c0.05) between fish fed on probiotics diet and fish fed on control diet in weight gain (WG), relative growth rate (RGR) and food conversion rate (FCR). The weight gain in the probiotics group was 18.3 g, while in the control group was 12.2 g. There was no significant difference (P\u3e 0.05) for the specific growth rate (SGR). The survival rate (SR%) was achieved at 100% in both groups. Also, there was a significant difference for the approximate composition of fish protein, fat and ash between the probiotics group and control group. From these results, it can be concluded that the probiotics group of Mugil sp. was better with 15.7% than the control group regarding to growth. Also, WG, RGR and FCR were better in the probiotics group than control group. The environmental indicators revealed that culture waters exposed to organic pollutants have led to a decline in the ratio of the concentration of dissolved oxygen, affecting the growth of fish negatively