masoumeh jahangiri

The purpose of this study was to evaluate different levels of substitution of poultry slaughter waste powder for fish meal in fingerlings shirbut diets. Four isonitrogenous and isocaloric diets (30.22±0.02% CP and 19.75±0.015 MJ kg-1 diet) were formulated. Treatments included control (no poultry slaughter waste powder) and diets 1, 2 and 3 with 50, 75 and 100% replacement of poultry slaughter waste powder, respectively, with fish meal. Each treatment consisted of three replicates with 50 shirbut (1.5±0.05 g) in 400 liter fiberglass tanks and 3% biomass fed 2 times (8 am and 16) ad libitum. The results showed that there was no significant difference in growth performance between different diets (p>0.05). There was no significant difference between treatments in apparent digestibility coefficient , blood biochemical composition and carcass composition (p>0.05). Therefore, it can be concluded that replacement of fish meal with poultry slaughter waste powder in the diets of fingerlings shirbut can be done without any negative effect.

This study was done in order to determine and compared the accumulation of iron and zinc in the muscle tissue of fish Cobia (Rachycentron canadum) and its relation to the total length, total weight and age of the fish in the waters of the Persian Gulf was northwest. 96 fish samples were collected at 6 length group. Measuring the level of essential elements samples were digested through dry digestion method. The difference between the means analysis of variance (ANOVA) and the presence or absence of difference and a significant relationship was estimated at 95%. Mean concentrations of iron and zinc in muscle tissue of Rachycentron canadum were 25.50±2.78 and 9.06±1.23 mg/kg dry weight (P<0.05). The highest concentration of iron in groups belonging to different lengths of 102-110 cm (28.21±0.74 mg/kg dry weight) and most of the zinc and nickel belonging to groups larger than 127 cm in length (10.27±0.47 mg/kg dry weight). A positive correlation was established between in the total length and total weight and age and accumulation of metals, iron and zinc at levels not significantly (P>0.05). Concentration of Zn in muscle ofRachycentron canadum was lower than more WHO, MAFF and NHMRC (1000, 50 and 100 mg/kg). Concentration of Fe in muscle ofthis fishwas higher than more FDA (5 mg/Kg).